WO2011125657A1 - 耐食性に優れた被覆物品の製造方法および被覆物品 - Google Patents
耐食性に優れた被覆物品の製造方法および被覆物品 Download PDFInfo
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- WO2011125657A1 WO2011125657A1 PCT/JP2011/057843 JP2011057843W WO2011125657A1 WO 2011125657 A1 WO2011125657 A1 WO 2011125657A1 JP 2011057843 W JP2011057843 W JP 2011057843W WO 2011125657 A1 WO2011125657 A1 WO 2011125657A1
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- Prior art keywords
- corrosion resistance
- coated article
- hard
- coating
- hard film
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- 230000007797 corrosion Effects 0.000 title claims abstract description 104
- 238000005260 corrosion Methods 0.000 title claims abstract description 104
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- 239000011651 chromium Substances 0.000 claims description 28
- 239000000758 substrate Substances 0.000 claims description 22
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 17
- 229910052804 chromium Inorganic materials 0.000 claims description 16
- 150000004767 nitrides Chemical class 0.000 claims description 16
- 238000005240 physical vapour deposition Methods 0.000 claims description 15
- 229910052796 boron Inorganic materials 0.000 claims description 13
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- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims description 6
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/021—Cleaning or etching treatments
- C23C14/022—Cleaning or etching treatments by means of bombardment with energetic particles or radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/028—Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0641—Nitrides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
- C23C14/325—Electric arc evaporation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/5873—Removal of material
- C23C14/588—Removal of material by mechanical treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a method for producing a coated article that requires corrosion resistance, such as a mold, a tool, and an injection molding part used for molding plastics and rubber, and a coated article.
- PVD physical vapor deposition
- Patent Document 1 there is a technique for improving wear resistance and film adhesion by nitriding the surface of a part for injection molding and then coating a CrN or TiN film by an arc ion plating method.
- Patent Document 2 the CrN film having excellent adhesion and corrosion resistance to the base material is coated first, and then a high-hardness TiN film is coated in multiple layers, thereby improving the corrosion resistance.
- Patent Document 2 There is a method of giving (Patent Document 2).
- Patent Document 3 it is conceivable to introduce the ion etching of Patent Document 3 on the surface of the hard film of Patent Documents 1 and 2.
- ion etching of Patent Document 3 it is conceivable to introduce the ion etching of Patent Document 3 on the surface of the hard film of Patent Documents 1 and 2.
- removal of droplets or the like that still exerts its effect cannot be achieved.
- the sandblasting of patent document 4 since this is a rough processing method exclusively by the grinding action of spraying particles on the surface of the film, it is difficult to obtain a smooth surface preferable for improving corrosion resistance.
- an object of the present invention is to provide a method for producing a coated article and a coated article with improved corrosion resistance of a hard coating.
- the present inventor examined a method for suppressing defects penetrating from the surface of the hard film coated with PVD toward the base material. As a result, in order to suppress this, it has been found that removing impurities such as droplets on the surface of the coating without leaving as much as possible during the coating process is important for improving the corrosion resistance. In addition to this, it was also found that the surface of the film after removing droplets and the like has a certain surface roughness that improves the corrosion resistance. And the present invention has been achieved by realizing a coating structure having excellent corrosion resistance as a coated article.
- the present invention is a method for producing a coated article having excellent corrosion resistance, in which a hard film comprising at least two layers or more is coated on the substrate surface of the article by PVD. Coating the surface of the first hard coating with the step of coating the surface of the first hard coating with the step of coating the second hard coating on the surface of the first hard coating.
- This is a method for producing a coated article excellent in corrosion resistance, further comprising a step of polishing to an average roughness Ra of 0.05 ⁇ m or less and a maximum height Rz of 1.00 ⁇ m or less.
- each arithmetic average roughness Ra and maximum height Rz preferably satisfy the following formulas 1 to 3.
- Formula 2 For Rz, C / B ⁇ 0.1 Equation 3
- the surface of the first hard film is polished so that the number density of the peaks and valleys at a distance of 50 nm or more from the average line is 50 pieces / mm 2 or less, respectively, in the sectional curve obtained by measuring the section. It is desirable.
- the first and / or second hard coating is preferably chromium nitride. Furthermore, it is desirable that these hard coatings are chromium-based nitrides containing one or more elements selected from Mo, Nb, W, Si, and B.
- the second hard film is a chromium-based nitride whose component composition is (Cr 1 ⁇ a X a ) N (provided that the subscript number represents the atomic ratio of Cr to element X).
- X is one or more elements selected from Mo, Nb, and W, and a is preferably 0.1 to 0.2.
- X is one or more elements selected from Si and B, and a is preferably 0.03 to 0.10.
- each of the arithmetic average roughness Ra and the maximum height Rz preferably satisfy the following formulas 1 to 3.
- the physical vapor deposition method is preferably an arc ion plating method, and the coated article formed by these is preferably an injection molding part or a mold.
- the coated article of the present invention is obtained by the above-described production method of the present invention, and is a coated article in which a hard film is coated on the surface of a base material of the article by a physical vapor deposition method. It comprises at least two layers of a first hard film coated on the surface of the material and a second hard film coated directly on the polished first hard film, and the first hard film and the second hard film It is a coated article excellent in corrosion resistance in which the number of droplets having a major axis of 1 ⁇ m or more straddling the interface of the hard coating is less than 2 (including 0) per 50 ⁇ m interface length in cross-sectional structure observation.
- the first and / or second hard coating is preferably a chromium nitride. Furthermore, it is desirable that these hard coatings are chromium-based nitrides containing one or more elements selected from Mo, Nb, W, Si, and B.
- the second hard film is a chromium-based nitride whose component composition is (Cr 1 ⁇ a X a ) N (provided that the subscript number represents the atomic ratio of Cr to element X).
- X is one or more elements selected from Mo, Nb, and W, and a is preferably 0.1 to 0.2.
- X is one or more elements selected from Si and B, and a is preferably 0.03 to 0.10.
- the surface of the second hard coating is polished.
- the physical vapor deposition method is preferably an arc ion plating method
- the coated article of the present invention is preferably an injection molding part or a mold.
- the surface of the first hard film in the middle of the coating of the hard film is optimally polished, so that there are very few defects penetrating toward the substrate after the second film is coated. Therefore, it exhibits excellent corrosion resistance.
- the second hard coating can be given further improvement in corrosion resistance and high hardness by making the structure fine, it is a coating excellent in wear resistance in addition to corrosion resistance. Can be an article. Therefore, the present invention is useful for manufacturing injection molding parts, tools, and molds that are exposed to corrosive environments.
- Sample No. of the present invention example It is an example of the cross-sectional curve of 1st 1st hard film. The arrow indicates the average line.
- Sample No. of Comparative Example 8 is an example of a cross-sectional curve of the first hard coating of No. 8; The arrow indicates the average line.
- Sample No. of the present invention example. 2 is a photomicrograph of the surface of a hard coating film showing the results of a corrosion test performed in 1.
- Sample No. of the present invention example. 2 is a micrograph of the surface of a hard coating film showing the result of a corrosion test performed in 2.
- Sample No. of Comparative Example 5 is a micrograph of the surface of a hard coating film showing the result of a corrosion test (immersion time is 10 hours) performed in 5.
- Comparative Example 7 is a photomicrograph of the surface of a hard coating film showing the results of a corrosion test (immersion time is 10 hours) performed in 7.
- Sample No. of Comparative Example 9 is a photomicrograph of the surface of a hard coating film showing the results of a corrosion test performed in No. 9.
- Sample No. of Comparative Example 10 is a micrograph of the surface of a hard coating film showing the results of a corrosion test conducted in No. 10.
- Sample No. of the present invention example. 12 is a photomicrograph of the surface of the hard coating film showing the results of the corrosion test conducted in No. 12.
- Sample No. of the present invention example. 15 is a photomicrograph of the surface of the hard coating film showing the result of the corrosion test conducted in No. 15. Sample No. of the present invention example.
- Sample No. of the present invention example. 27 is a photomicrograph of the surface of a hard coating film showing the results of a corrosion test performed in No. 27.
- Sample No. of the present invention example. 2 is a micrograph of a hard coating surface showing the results of a corrosion test conducted in No. 28.
- Sample No. of the present invention example. 3 is a photomicrograph of the surface of a hard coating film showing the results of a corrosion test performed at 32.
- Sample No. of the present invention example. It is a scanning electron micrograph which shows the torn surface structure of 12 hard films. The upper side of the photograph is the second film, and the lower side is the first film.
- Sample No. of the present invention example It is a scanning electron micrograph which shows the fracture surface structure of 11 hard coatings. The upper side of the photograph is the second film, and the lower side is the first film. It is the schematic of the film-forming apparatus used in the Example.
- Sample No. of the present invention example. 1 is a microstructural photograph of 1 hard coating cross section. It is a base material, the 1st coat, and the 2nd coat from the bottom.
- Sample No. of Comparative Example 8 is a microstructural photograph of 8 hard coating cross section. It is a base material, the 1st coat, and the 2nd coat from the bottom.
- the present inventor found out that local corrosion is caused by irregularities originating from droplets, particles, and the like on the first hard film, while earnestly studying a method for suppressing the corrosion of the film. Then, in addition to the hard coating being divided into the first hard coating and the second hard coating, the second hard coating is continuously applied after the first hard coating is coated. Instead, first, the first hard film is polished and smoothed to have a certain surface roughness, and then the second hard film is coated thereon, whereby the corrosion resistance of the entire film can be greatly improved. In addition, the present inventors have also found a film structure having excellent corrosion resistance. Details will be described below.
- the first hard film is polished on the first hard film by removing droplets and particles to obtain a smooth surface state. This is because it is coated so as to fill in the fine irregularities on the surface of the hard film, and the corrosion resistance of the entire film can be greatly improved.
- Corrosion resistance can be improved by smoothing the surface of the first hard film to be coated by the production method of the present invention so that the film surface has a certain surface roughness. That is, the corrosion resistance is improved by polishing the arithmetic average roughness Ra in the surface roughness specified in JIS-B-0602-2001 to 0.05 ⁇ m or less and the maximum height Rz to 1.00 ⁇ m or less. I can do it.
- the second hard coating is preferably in the same surface roughness range. In order to make the surface of the first hard film have this preferable surface roughness, the surface of the film is not sufficiently smoothed by a grinding action such as ion etching or sand blasting (shot blasting), and the corrosion resistance of the film is reduced. May be inferior.
- a polishing means that precisely finishes the surface of the part to have a correct uniform surface when finishing machine parts. For example, using a surface plate, a lapping agent is placed between the hard film and the hard film.
- a polishing agent having diamond particles and humidity is used.
- the length of the interface in the cross-sectional structure observation is a droplet composed of at least two layers of the second hard film coated immediately above the film and having a major axis of 1 ⁇ m or more straddling the interface between the first hard film and the second hard film.
- the coated article of the present invention having excellent corrosion resistance having a number per 50 ⁇ m of less than 2 (including 0) can be obtained. When coarse droplets are present, internal defects such as voids are formed between the film deposited on the upper surface thereof.
- the average number of droplets having a major axis of 1 ⁇ m or more straddling the smoothed interface across the interface between the first hard film and the second hard film is less than 2 per 50 ⁇ m interface length in cross-sectional structure observation (0 Included). This is because the presence of about two droplets having a major axis of less than 1 ⁇ m and about two units having a major axis of 1 ⁇ m or more does not significantly affect the corrosion resistance.
- the surface roughness of the substrate before coating is also polished smoothly.
- the surface roughness of the base material before coating the hard film is A
- the surface roughness before polishing of the first hard film is B
- the surface roughness after polishing of the first hard film is C.
- each of the arithmetic average roughness Ra and / or the maximum height Rz satisfy the relationship of A ⁇ C ⁇ B.
- the surface roughness after polishing of the second hard film is defined as D, and A ⁇ It is preferable to satisfy the relationship C ⁇ D ⁇ B.
- the surface roughness of the first hard coating is preferably smoother than the surface roughness of the second hard coating after polishing, and the surface roughness of the substrate before coating is the smoothest. It is preferable.
- the droplets and the like on the surface at the time of coating are removed by polishing, and the degree of removal, that is, the surface roughness C after polishing is relative to the surface roughness B before polishing. It is desirable to finish so that C / B is less than 0.4 for Ra and C / B is less than 0.1 for Rz. By satisfying these equations, defects in the hard coating can be further reduced.
- the number density of the peaks (convex portions) and valley bottoms (concave portions) having a distance from the average line of 50 nm or more is 50 / mm 2 or less, respectively. It is preferable to polish.
- the average line is the center line of the peak and valley bottom in the cross-sectional curve. The number of peaks at 50 nm or more from the center line was investigated, and the number density was measured.
- the first and / or second hard coating that is coated by the production method of the present invention is preferably a chromium-based nitride that is excellent in corrosion resistance.
- the chromium-based nitride means that the chromium content in the metal (including metalloid) portion is 50 atomic% or more.
- the first and / or second hard coating is preferably a chromium nitride containing one or more elements selected from Mo, Nb, W, Si, and B. By adding Mo, Nb, and W into the film, the hardness is improved and the wear resistance is improved.
- the chromium-based nitride in order to maintain the toughness and adhesion of the chromium-based nitride itself, it is a chromium-based nitride whose component composition is represented by (Cr 1 ⁇ a X a ) N (however, the subscript number is X represents an atomic ratio of Cr and element X), X is one or more elements selected from Mo, Nb, and W, and a is preferably 0.1 to 0.2.
- Si and B are added in a film
- the preferred film hardness is 2000HV 0.025 or more. And corrosion resistance improves more because a membrane
- the chromium nitride When a reinforcing material such as glass fiber is added to the material to be molded, the hard film is likely to corrode due to wear. Therefore, by imparting high hardness to the hard coating, wear corrosion can be suppressed in addition to improvement of wear resistance.
- a chromium nitride having a component composition represented by (Cr 1 ⁇ a X a ) N (however, subscript The number represents the atomic ratio of Cr to element X), X is one or more elements selected from Si and B, and a is preferably 0.03 to 0.10.
- the coating means used in the production method of the present invention requires a physical vapor deposition method in which the hard film to be coated has high film adhesion.
- a physical vapor deposition method in which the hard film to be coated has high film adhesion.
- the arc ion plating method having particularly high film adhesion is preferable.
- the film forming chamber 2 includes a plurality of arc discharge evaporation sources 3, 4, and 5 for mounting various targets (cathodes) 1, and a substrate holder 6 for mounting the substrate 7.
- a rotation mechanism 8 is provided below the substrate holder 6, and the substrate 7 rotates and revolves through the substrate holder 6. And when the base material 7 opposes various targets, the film
- the target used in this example is a metal target produced by a powder metallurgy method.
- the evaporation sources 3 to 5 were appropriately equipped with a target constituting the metal component of the hard film and a target for metal ion etching.
- JIS-SKD11 equivalent steel material tempered to 57-60HRC is used for the base material, and the surface of the base material is subjected to arithmetic mean roughness Ra 0.01 ⁇ m, Rz 0.07 ⁇ m before the first hard coating is coated on the base material. Polished. This was degreased and washed, and fixed to the substrate holder 7. And the base material was heated to 500 degreeC vicinity with the heater for heating (not shown) installed in the chamber 2, and it hold
- Table 1 shows the prepared samples.
- the hard coating is CrN.
- Sample No. which is an example of the present invention.
- 1 is an aero lapping process (manufactured by Yamashita Towers Co., Ltd.) as a means for removing the base material from the chamber after the first CrN coating and polishing the surface of the substrate (hereinafter abbreviated as intermediate surface treatment). Aero lapping machine (AERO LAP YT-300) is used, followed by polishing with 1 ⁇ m diamond paste, followed by SMAP treatment (using Kagami Tekko's specular shot machine SMAP-II) Went. Then, after degreasing and cleaning, the film was returned to the chamber again, and Ar ion etching and Ti metal ion etching were performed to cover the second CrN, thereby completing a hard film.
- AERO LAP YT-300 Aero lapping machine
- SMAP treatment using Kagami Tekko's specular shot machine SMAP-II
- Sample No. 2-7 after the following intermediate surface treatment, Sample No. The second CrN was coated in the same manner as in 1. Sample No. 2 performed the intermediate surface treatment of only the above-described aero wrap treatment. Sample No. The intermediate surface treatment of Sample No. 3 Then the SMAP process was omitted. Sample No. For the intermediate surface treatment of No. 4, a nylon nonwoven fabric coated with an abrasive (Polishing pads # 1500 to # 3000 manufactured by Bell Star Abrasive Industry Co., Ltd.) was used.
- Sample No. 6 and 7 correspond to Patent Document 4. That is, instead of the intermediate surface treatment of the present invention, sandblast treatment (projection material: # 400 to 600 sand) was performed.
- Sample No. which is a comparative example. 8 and 9 correspond to Patent Document 3. That is, after coating with the first CrN, the sample No. As in 1 to 5, it is taken out from the chamber and returned to the chamber without intermediate surface treatment (however, No. 9 was only subjected to degreasing cleaning), and the same as the base material before coating with the second CrN Ar ion etching and Ti metal ion etching were performed.
- Sample No. which is a comparative example. No. 10 corresponds to Patent Documents 1 and 2 and is formed without taking out from the chamber. Finally, the above sample No. The outermost surface of 1 to 10 was polished with diamond paste.
- the measurement conditions are an evaluation length: 4.0 mm, a measurement speed: 0.3 mm / s, and a cut-off value: 0.8 mm. And about the 1st film
- the measurement conditions are an evaluation length: 1.0 mm, a measurement speed: 0.15 mm / s, and a ⁇ s value: 0.8 mm.
- Table 2 shows the relationship between the base material before coating the hard coating and the surface roughness Ra, Rz of the first and second hard coatings.
- the surface of the film after the corrosion resistance evaluation test is shown in FIGS. 2A to 2F (in the figure, the light-colored portion confirmed to be spherical is pitting corrosion).
- the hard coating satisfying the production method of the present invention has a smooth surface roughness on the outermost surface of the coating and is excellent in corrosion resistance.
- the surface of the film after the corrosion resistance evaluation test is such that pitting corrosion with a very small diameter is confirmed as shown in FIGS. 2A to 2F.
- Example 1 Various samples in which only the type of the hard coating was changed under the same film forming conditions as in No. 1 were prepared. The details are as shown in Table 3. Then, the hardness and corrosion resistance of the coating surface were evaluated. The hardness was measured according to JIS-Z-2244 by using a micro Vickers tester to measure the hardness HV0.025 of the coating surface. The test load is 0.2452N. The surface roughness and uneven defect density of the hard film were measured in accordance with JIS-B-0602-2001 as in Example 1, and the arithmetic average roughness Ra, the maximum height Rz, and the number of uneven defects were measured from the roughness curve. The corrosion resistance evaluation test is under the same conditions as in Example 1 except that the immersion time is 10 hours. These test results are shown in Table 3. The surface of the film after the corrosion resistance evaluation test is shown in FIGS. 3A to 3F (in the figure, the light-colored portion confirmed to be spherical is pitting corrosion).
- sample No. satisfying the present invention is shown.
- No. 11-34. 11 to 21 and 28 to 34 are particularly excellent in the balance between excellent corrosion resistance and high hardness.
- sample no. 12-20 and 28-34 have high hardness.
- 3A to F show sample No. 12, 15, 23, 27, 28, 32 shows the coating surface after the corrosion resistance evaluation test. No noticeable pitting corrosion is observed in 12, 15, 32.
- Example 1 and Example 2 were subjected to cross-sectional observation of a plurality of visual fields in order to search for a factor for improving the corrosion resistance.
- sample No. 1 and Comparative Example No. 6A and 6B show microstructural photographs taken with a scanning electron microscope in the cross-sectional observation of No. 8.
- FIG. As shown in FIG. In No. 1, coarse droplets of 1 ⁇ m or more are not confirmed on the interface.
- the number of droplets of 1 ⁇ m or more was 1 or less per 50 ⁇ m of interface length. Further, it was confirmed that the droplets present at the interface in the present invention example were removed or polished to constitute a smooth surface that did not cross the interface. On the other hand, the sample No. of the comparative example having poor corrosion resistance. In No. 8, four coarse droplets of 1 to 2 ⁇ m across the interface between the first hard film and the second hard film were confirmed per 50 ⁇ m of interface length in cross-sectional structure observation. When coarse droplets are present, internal defects such as voids are formed between the film deposited on the upper surface thereof. This defect promotes corrosion. In the example of the present invention, it can be seen that the influence of such coarse droplets can be eliminated by the polishing treatment, thereby improving the corrosion resistance.
- a film component is adjusted to provide release properties from a molding material. It can be applied to metal injection molding dies and various machine parts.
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Abstract
Description
Raおよび/またはRzについて、A<C<B・・・式1
Raについて、C/B<0.4・・・式2
Rzについて、C/B<0.1・・・式3
あるいはさらに、第1の硬質皮膜の表面は、その断面測定による断面曲線において、平均線からの距離が50nm以上の山頂および谷底の個数密度が、それぞれ50個/mm2以下になるように研磨することが望ましい。
Raおよび/またはRzについて、A<C<D<B・・・式1
Raについて、C/B<0.4・・・式2
Rzについて、C/B<0.1・・・式3
また、物理蒸着法はアークイオンプレーティング法であることが望ましく、これらによる被覆物品は、射出成形用部品または金型であることが望ましい。
また、第2の硬質皮膜の表面が研磨されていることが望ましい。また、物理蒸着法はアークイオンプレーティング法であることが望ましく、本発明の被覆物品は、射出成形用部品または金型であることが望ましい。
第1の硬質皮膜の表面をこの好ましい表面粗さにするには、イオンエッチングやサンドブラスト(ショットブラスト)等の研削作用によるものでは皮膜表面の平滑化が不十分であり、皮膜の耐腐食性に劣る場合がある。そこで、ドロップレットやパーティクル等を確実に除去し平滑な表面状態にするためには、次のような研磨方法を採用することが好ましい。
(1)機械部品の仕上げを行う場合に部品表面が正しい均一面を持つように精密に仕上げていく研磨手段であって、例えば定盤を使用して、その硬質皮膜との間にラップ剤を挟み、硬質皮膜を摺動させて研磨する方法
(2)ダイヤモンドペースト等の研磨剤を保持した研磨布で硬質皮膜の表面を磨く方法
(3)ダイヤモンド粒子と湿度を持った研磨剤を用い、基材に被覆された皮膜に高速に滑走させて、発生する摩擦力によって磨く、いわゆるエアロラップ(株式会社ヤマシタワークスの登録商標である)等による研磨方法
(4)エアーを使用せずに弾性と粘着性を持った研磨剤を噴射することで磨く、いわゆるスマップ(SMAP)(合資会社亀井鉄工所製の鏡面ショットマシンである)等による研磨方法
更に、これらの処理後には3μm以下のダイヤモンドペースト磨きをすることで、より望ましい平滑化が実現出来る。また、耐腐食性を向上させるために、第2の硬質皮膜の表面上も同様の研磨方法で平滑化することが好ましい。
粗大なドロップレットが存在すると、その上面に堆積する皮膜との間に空隙等の内部欠陥が形成される。この欠陥を通して腐食が進行する。従い硬質皮膜の形成工程の中間で研磨処理を行い平滑化することは、硬質皮膜の深さ方向の内部欠陥の連通を遮断するのに有効である。
本発明では、平滑化された界面を第1の硬質皮膜と第2の硬質皮膜の界面をまたぐ長径1μm以上のドロップレットが断面組織観察における界面長さ50μmあたりの平均個数が2個未満(0を含む)として規定した。これは長径1μm未満のドロップレットおよび長径1μm以上であっても50μmあたり2個程度の存在は耐食性に大きな影響はないためである。
本発明においては第1の硬質皮膜の表面を平滑にすることが重要であり、第2の硬質皮膜を研磨する場合でも、第2の硬質皮膜の研磨後の表面粗さをDとして、A<C<D<Bの関係を満たすことが好ましい。
基材表面を平滑化することで、基材表面の凹凸に起因する皮膜欠陥を抑制することが出来る。基材の直上にある皮膜欠陥は直接的に基材自体を著しく腐食する原因となり、基材に近い側の皮膜の皮膜欠陥が少ないことがより好ましい。そのため、研磨後の第2の硬質皮膜の表面粗さよりも、第1の硬質皮膜の表面粗さが平滑であることが好ましく、更には被覆する前の基材の表面粗さが最も平滑であることが好ましい。
また、第1の硬質皮膜については、その被覆時の表面にあるドロップレット等を研磨除去するところ、除去の程度すなわち研磨後の表面粗さCは、研磨前の表面粗さBに対して、RaではC/Bが0.4未満に、RzではC/Bが0.1未満になるよう仕上げることが望ましい。これらの式を満たすことによって、硬質皮膜の欠陥をより低減できる。
なお、平均線とは、断面曲線における山頂と谷底の中心線であり、その中心線からそれぞれ50nm以上にあるピーク数を調査して、それぞれの個数密度を測定した。
また、該第1および/または第2の硬質皮膜は、Mo、Nb、W、Si、Bから選択される1種または2種以上の元素を含むクロム系窒化物であることが好ましい。Mo、Nb、Wが皮膜中へ添加されることで、硬度が向上し耐摩耗性が向上する。その中でもクロム系窒化物自体の靭性と密着性の維持に有利であるには、成分組成が(Cr1-aXa)Nで示されるクロム系窒化物であって(但し、下付き数字はCrと元素Xの原子比を表す)、XはMo、Nb、Wから選択される1種または2種以上の元素であり、aは0.1~0.2であることが好ましい。
そして、Si、Bが皮膜中に添加されることで、皮膜が微細になり高硬度になる。好ましい皮膜硬度は2000HV0.025以上である。そして皮膜が微細化されることで、より耐食性が向上する。被成形材にガラス繊維等の強化物質が添加されると、硬質皮膜は摩耗に起因する腐食も生じ易くなる。よって、硬質皮膜には高い硬度をも付与することで、耐摩耗性の向上に加えては、摩耗腐食も抑制できる。これらの効果を発揮しクロム系窒化物自体の靭性と密着性を低下させないためには、成分組成が(Cr1-aXa)Nで示されるクロム系窒化物であって(但し、下付き数字はCrと元素Xの原子比を表す)、XはSi、Bから選択される1種または2種以上の元素であり、aは0.03~0.10であることが好ましい。
比較例である試料No.8、9は、特許文献3に相当するものである。つまり、第1のCrNを被覆後に、試料No.1~5に同様、チャンバーから取り出し、中間表面処理は行わずにそのままチャンバー内へ戻し(但し、No.9は脱脂洗浄のみ行った)、第2のCrNを被覆する前に、基材と同じArイオンエッチングおよびTi金属イオンエッチングを行ったものである。
比較例である試料No.10は、特許文献1や2に相当するものであり、チャンバーから取り出すことなく、成膜したものである。
そして最後には、上記の試料No.1~10の最表面をダイヤモンドペーストで磨いた。
JIS-B-0602-2001に従って、粗さ曲線より算術平均粗さRaと最大高さRzを測定した。測定条件は、評価長さ:4.0mm、測定速度:0.3mm/s、カットオフ値:0.8mmである。そして、第1の皮膜表面については、本発明が定義する山頂および谷底の個数密度を、前記規格に従った断面曲線にて測定した。測定条件は、評価長さ:1.0mm、測定速度:0.15mm/s、λs値:0.8mmである。また、皮膜表面の中心部から縦、横それぞれ長さ1.0mmの断面曲線より、その平均線から50nm以上窪んだ凹部(谷底)と、同50nm以上突出した凸部(山頂)をカウントした。そしてこの作業を3回繰り返して得た平均値をそれぞれの縦と横での個数を乗じ、個数密度とした。図1AおよびBには、それぞれ試料No.1および8の、その代表される断面曲線を示す。
実際の射出成形中に発生するハロゲンガスなどの腐食ガスを模擬して、試料を10%硫酸水溶液中に20時間浸漬する試験を実施した。前記水溶液の温度は50℃とし、JIS-G-0591-2007に従って、試験片の被覆された面以外はマスキングした。そして、浸漬後には、その腐食による減量を記録するとともに、表面に現れる孔食(ピット)の観察を行った。試験面に対する腐食の面積率は、顕微鏡写真(倍率:8倍)にて評価した。
図4AおよびBは、それぞれ試料No.11および12の破断面組織を示す走査型電子顕微鏡写真である。試料No.11の第2の硬質皮膜が柱状構造となっており、試料No.12の第2の硬質皮膜は組織が微細化されていることが確認される。
典型例として本発明例の試料No.1と比較例No.8の断面観察における走査型電子顕微鏡によるミクロ組織写真を図6AおよびBに示す。
図6Aに示すとおり、本発明例の試料No.1では、界面上に1μm以上の粗大なドロップレットは確認されない。
また、本発明例のすべての試料では、本発明例の試料No.1と同様な形態であり、1μm以上のドロップレットは界面長さ50μmあたり1個以下であった。また、本発明例では界面に存在するドロップレット自体が、除去されるか、研磨されて界面をまたぐことのない平滑面を構成していることが確認された。
一方、耐食性の悪い比較例の試料No.8では、第1の硬質皮膜と第2の硬質皮膜の界面をまたぐ1ないし2μmの粗大なドロップレットが断面組織観察における界面長さ50μmあたり4個確認された。
粗大なドロップレットが存在すると、その上面に堆積する皮膜との間に空隙等の内部欠陥が形成される。この欠陥は腐食を助長するものである。
本発明例では、このような粗大なドロップレットの影響を研磨処理により排除できており、これにより耐食性が向上していることがわかる。
2 成膜チャンバー
3 蒸発源
4 蒸発源
5 蒸発源
6 基材ホルダー
7 基材
8 回転機構
Claims (19)
- 物品の基材表面に物理蒸着法によって少なくとも2層以上からなる硬質皮膜を被覆した耐食性に優れた被覆物品の製造方法であって、該製造方法は、
前記基材表面に第1の硬質皮膜を被覆するステップと、
前記第1の硬質皮膜の表面に第2の硬質皮膜を被覆するステップとを含み、
前記第2の硬質皮膜を被覆するステップの前に、前記第1の硬質皮膜の表面を、算術平均粗さRaが0.05μm以下、かつ最大高さRzが1.00μm以下に研磨するステップを更に含む、耐食性に優れた被覆物品の製造方法。 - 前記第1の硬質皮膜を被覆する前の前記基材の表面粗さをA、前記第1の硬質皮膜の研磨前の表面粗さをB、前記第1の硬質皮膜の研磨後の表面粗さをCとしたとき、各々の算術平均粗さRaと最大高さRzが、下記の式1~3を満たすことを特徴とする請求項1に記載の耐食性に優れた被覆物品の製造方法。
Raおよび/またはRzについて、A<C<B・・・式1
Raについて、C/B<0.4・・・式2
Rzについて、C/B<0.1・・・式3 - 前記研磨するステップが、第1の硬質皮膜の表面を、断面測定による断面曲線において、平均線からの距離が50nm以上の山頂および谷底の個数密度が、それぞれ50個/mm2以下になるように研磨することを特徴とする請求項1または2に記載の耐食性に優れた被覆物品の製造方法。
- 前記第1および/または第2の硬質皮膜は、クロム系窒化物であることを特徴とする請求項1ないし3のいずれかに記載の耐食性に優れた被覆物品の製造方法。
- 前記第1および/または第2の硬質皮膜は、Mo、Nb、W、Si、Bから選択される1種または2種以上の元素を含むクロム系窒化物であることを特徴とする請求項4に記載の耐食性に優れた被覆物品の製造方法。
- 前記第2の硬質皮膜は、成分組成が(Cr1-aXa)Nで示されるクロム系窒化物であって、XはMo、Nb、Wから選択される1種または2種以上の元素であり、aは0.1~0.2であることを特徴とする請求項5に記載の耐食性に優れた被覆物品の製造方法。
- 前記第2の硬質皮膜は、成分組成が(Cr1-aXa)Nで示されるクロム系窒化物であって、XはSi、Bから選択される1種または2種以上の元素であり、aは0.03~0.10であることを特徴とする請求項5に記載の耐食性に優れた被覆物品の製造方法。
- 前記第2の硬質皮膜を被覆するステップの後に、前記第2の硬質皮膜の表面を研磨するステップを更に含むことを特徴とする請求項1ないし7のいずれかに記載の耐食性に優れた被覆物品の製造方法。
- 硬質皮膜を被覆する前の前記基材の表面粗さをA、前記第1の硬質皮膜の研磨前の表面粗さをB、前記第1の硬質皮膜の研磨後の表面粗さをC、前記第2の硬質皮膜の研磨後の表面粗さをDとしたとき、各々の算術平均粗さRaと最大高さRzが、下記の式1~3を満たすことを特徴とする請求項8に記載の耐食性に優れた被覆物品の製造方法。
Raおよび/またはRzについて、A<C<D<B・・・式1
Raについて、C/B<0.4・・・式2
Rzについて、C/B<0.1・・・式3 - 物理蒸着法は、アークイオンプレーティング法であることを特徴とする請求項1ないし9のいずれかに記載の耐食性に優れた被覆物品の製造方法。
- 前記被覆物品が、射出成形用部品または金型であることを特徴とする請求項1ないし10のいずれかに記載の耐食性に優れた被覆物品の製造方法。
- 物品の基材表面に物理蒸着法によって硬質皮膜を被覆した被覆物品であって、該硬質皮膜は、前記基材表面に被覆された第1の硬質皮膜と、研磨された第1の硬質皮膜の直上に被覆された第2の硬質皮膜の少なくとも2層以上からなり、かつ前記第1の硬質皮膜と前記第2の硬質皮膜の界面をまたぐ長径1μm以上のドロップレットが、断面組織観察における界面長さ50μmあたりの個数が2個未満(0を含む)であることを特徴とする耐食性に優れた被覆物品。
- 前記第1および/または第2の硬質皮膜は、クロム系窒化物であることを特徴とする請求項12に記載の耐食性に優れた被覆物品。
- 前記第1および/または第2の硬質皮膜は、Mo、Nb、W、Si、Bから選択される1種または2種以上の元素を含むクロム系窒化物であることを特徴とする請求項13に記載の耐食性に優れた被覆物品。
- 前記第2の硬質皮膜は、成分組成が(Cr1-aXa)Nで示されるクロム系窒化物であって、XはMo、Nb、Wから選択される1種または2種以上の元素であり、aは0.1~0.2であることを特徴とする請求項14に記載の耐食性に優れた被覆物品。
- 前記第2の硬質皮膜は、成分組成が(Cr1-aXa)Nで示されるクロム系窒化物であって、XはSi、Bから選択される1種または2種以上の元素であり、aは0.03~0.10であることを特徴とする請求項14に記載の耐食性に優れた被覆物品。
- 第2の硬質皮膜は、表面が研磨されていることを特徴とする請求項12ないし16のいずれかに記載の耐食性に優れた被覆物品。
- 物理蒸着法は、アークイオンプレーティング法であることを特徴とする請求項12ないし17のいずれかに記載の耐食性に優れた被覆物品。
- 前記被覆物品は、射出成形用部品または金型であることを特徴とする請求項12ないし18のいずれかに記載の耐食性に優れた被覆物品。
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Cited By (6)
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JP2013132393A (ja) * | 2011-12-26 | 2013-07-08 | Polyplastics Co | プレフィルドシリンジ用外筒の製造方法 |
WO2016027832A1 (ja) * | 2014-08-20 | 2016-02-25 | 日立金属株式会社 | ダイカスト用被覆金型の製造方法 |
JPWO2014192730A1 (ja) * | 2013-05-30 | 2017-02-23 | 日立金属株式会社 | 冷間加工用金型の製造方法 |
JPWO2018096820A1 (ja) * | 2016-11-22 | 2019-06-24 | 国立研究開発法人産業技術総合研究所 | 木質流動成形用金型及びそれを用いた木質流動成形用金型システム並びに植物系材料からなる成形体の製造方法 |
WO2019167674A1 (ja) | 2018-02-27 | 2019-09-06 | 日立金属株式会社 | 被覆部材およびその製造方法 |
WO2020090475A1 (ja) * | 2018-10-31 | 2020-05-07 | 東洋製罐グループホールディングス株式会社 | 金属塑性加工用治具 |
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DE102016225449A1 (de) * | 2016-12-19 | 2018-06-21 | Robert Bosch Gmbh | Verfahren zum Beschichten eines metallischen Bauteils mit einer Verschleißschutzschicht, metallisches Bauteil sowie Kraftstoffeinspritzsystem |
JP6733844B1 (ja) * | 2020-04-15 | 2020-08-05 | マツダ株式会社 | 被覆金属材の耐食性試験方法及び耐食性試験装置 |
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CN102803546B (zh) | 2014-12-31 |
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CN102803546A (zh) | 2012-11-28 |
JP5498572B2 (ja) | 2014-05-21 |
KR101455142B1 (ko) | 2014-10-27 |
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