CN118499145A - Laser ceramic alloy piston skirt - Google Patents
Laser ceramic alloy piston skirt Download PDFInfo
- Publication number
- CN118499145A CN118499145A CN202410629826.8A CN202410629826A CN118499145A CN 118499145 A CN118499145 A CN 118499145A CN 202410629826 A CN202410629826 A CN 202410629826A CN 118499145 A CN118499145 A CN 118499145A
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- CN
- China
- Prior art keywords
- piston skirt
- ceramic alloy
- layer
- laser
- ceramic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/004—Cylinder liners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0084—Pistons the pistons being constructed from specific materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
- F02F3/025—Pistons having means for accommodating or controlling heat expansion having circumferentially slotted piston skirts, e.g. T-slots
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The laser ceramic alloy piston skirt is provided with a piston skirt body, the upper end of the piston skirt body is provided with an annular bulge, and a sealing groove is arranged outside the annular bulge; the middle part of the piston skirt body is provided with an inward convex ring, bolt holes and threaded holes are uniformly distributed in the circumferential direction of the piston skirt body; a ceramic alloy layer formed by melting, cooling and solidifying the ceramic alloy through laser beam scanning and heating; the laser beam scans and heats to enable the inner layer of the ceramic alloy layer to be quickly fused with the surface layer of the piston skirt body, and then the transition layer is formed after cooling. Never fall off. And the environment is not polluted, and the environment is more friendly. The relative wear resistance of the cast iron piece after the laser surface is ceramic is improved by more than 90 percent compared with that of the untreated cast iron piece.
Description
Technical Field
The invention relates to the field of machinery, in particular to a piston skirt of a two-stroke low-speed diesel engine, and in particular relates to a corrosion-resistant, high-temperature-resistant and wear-resistant ceramic alloy piston skirt.
Background
Ships are classified into tankers, bulk carriers, container ships, natural gas ships and other special ships according to the type of cargo transported. These vessels are powered by two-stroke low-speed diesel engines. The piston skirt is an essential component of a diesel engine. Two-stroke low-speed diesel engines are classified by design company as MAN, WINGD, rols Luo Yisi, modern, general, cattler, etc. In the market, two diesel engines, namely a MAN and a WINGD, are mainly used, wherein a host of a MAN company accounts for about 90% of the market of the two-stroke low-speed diesel engine. The host of WINGD accounts for about 8% of the two-stroke low-speed diesel engine market, so the piston skirt of the invention is mainly matched with and used as a spare part of a two-stroke low-speed diesel engine of MAN and WINGD. The main engine of the piston skirt WINGD is provided with a piston skirt inlaid copper ring and a piston skirt nitriding two structural forms; the host of MAN company has two structural forms of inlaid copper ring and molybdenum plating. These several structural forms of the piston skirt each have advantages and disadvantages. In order to cope with the complicated working condition of the diesel engine, the MAN company basically adopts a molybdenum-coated piston skirt, and the piston skirt has defects, so that the environment is polluted in the production and manufacturing process, the physical and mental health of people is influenced, and the construction cost is high. By comprehensively considering the factors, the ceramic alloy piston skirt is specially developed to meet the design and service performance requirements of the two-stroke low-speed diesel engine.
Disclosure of Invention
According to the problems, the invention provides the laser ceramic alloy piston skirt, which solves the problems of high temperature resistance, corrosion resistance and abrasion resistance of the surface of the piston skirt.
The invention discloses a laser ceramic alloy piston skirt, which is provided with a piston skirt body and is characterized in that: the upper end of the piston skirt body is provided with an annular bulge, and a sealing groove is arranged outside the annular bulge; the middle part of the piston skirt body is provided with an inward convex ring, bolt holes are uniformly distributed on the surface between the two ends of the piston skirt body along the circumferential direction, and the two symmetrical positions are also respectively provided with a threaded hole; the surface of the outer circle of the piston skirt body is provided with a ceramic alloy layer, and a transition layer is arranged between the ceramic alloy layer and the outer circle of the piston skirt body.
The invention discloses a laser ceramic alloy piston skirt, which is further characterized in that: the ceramic alloy layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, melting the ceramic alloy through laser beam scanning heating, and cooling and solidifying the ceramic alloy; the transition layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, enabling the inner layer of the ceramic alloy layer to be quickly fused with the surface layer of the piston skirt body through laser beam scanning heating, and then cooling and solidifying.
The laser ceramic alloy piston skirt comprises a piston skirt body, wherein a ceramic alloy layer is arranged on the outer surface of the piston skirt body, ceramic alloy coating contains elements such as chromium, silicon and boron, alloy cast iron is adopted as a piston skirt body material, ceramic alloy is sprayed on the working surface of the outer circle of the piston skirt in advance, the alloy cast iron on the surface of the piston skirt is rapidly heated and melted under the action of a high-energy high-density laser beam, and the ceramic alloy rapidly and uniformly enters the piston skirt body and rapidly cools and solidifies to form a chilled alloying hardening layer, wherein the chilled alloying hardening layer comprises a ceramic alloy layer on the surface and a transition layer fused with the ceramic alloy layer. The alloyed hardened layer is composed of ultra-fine martensite with high hardness, ledeburite. The ceramic alloy layer can be of any thickness and is selected according to working condition requirements.
When the alloying coating has higher chromium, silicon and boron contents, the chromium, silicon and boron contents of the alloying layer are obviously improved compared with the base body. Therefore, after the surface of the piston skirt is subjected to laser ceramic alloying treatment, the piston skirt not only has high hardness and wear resistance, but also has good corrosion resistance and high temperature resistance, and the comprehensive performance is that the wear resistance is generally improved by more than 2 times. The invention has the greatest characteristics that the added coating and the base material perform full metallurgical action to form an alloying coating without obvious interface, and the high metallurgical bonding strength between the alloying coating and the base material is ensured. Pure chemical combination is directly melted on the body, and can not fall off. And the environment is not polluted, and the environment is more friendly.
The invention is suitable for any marine low-speed diesel engine.
Drawings
FIG. 1 is a cross-sectional view of a piston skirt body made of alloy cast iron after laser scanning to form a ceramic alloy layer (sample 1);
FIG. 2 is a cross-sectional view of a piston skirt body made of alloy cast iron after laser scanning to form a ceramic alloy layer (sample 2);
FIG. 3 is a ceramic alloy texture layer;
FIG. 4 is the hardness test results for sample 1 and sample 2;
FIG. 5 is a cross-sectional view A-A of a radial cross-section of a piston skirt;
Fig. 6 is a top view of the piston skirt:
Wherein: the piston skirt comprises a 1-piston skirt body, a 2-ceramic alloy layer, a 3-transition layer, a 4-sealing groove, a 5-threaded hole and a 6-bolt hole.
FIG. 7 is a grey cast iron basic structure morphology;
FIG. 8 is a grey cast iron eutectic structure morphology;
FIG. 9 is a grey cast iron remelted microstructure morphology;
FIG. 10 is a grey cast iron wear surface topography;
FIG. 11 is a wear surface topography after surface ceramization of gray cast iron.
Detailed Description
The invention seat is further described below with reference to the accompanying drawings:
Embodiment 1. The laser ceramic alloy piston skirt of the invention as shown in the accompanying drawings is provided with a piston skirt body 1, and is characterized in that: the upper end of the piston skirt body is provided with an annular bulge, and a sealing groove 4 is arranged outside the annular bulge; the middle part of the piston skirt body is provided with an inward convex ring, bolt holes 6 are uniformly distributed on the surface between the two ends of the piston skirt body along the circumferential direction, and the two symmetrical positions are also respectively provided with a threaded hole 5; the surface of the outer circle of the piston skirt body is provided with a ceramic alloy layer 2, and a transition layer 3 is arranged between the ceramic alloy layer and the outer circle of the piston skirt body.
The laser processing technology system consists of a 5000-10000W high-power CO2 laser, a special refrigerating system for laser, an external light path system and a multifunctional laser numerical control processing machine tool. The piston skirt is subjected to casting, processing and grinding according to the technological requirements, then the surface of the piston skirt is subjected to laser ceramic surface alloying treatment according to a specific processing technology, the thickness of an alloy layer is 0.25-0.3mm, the hardness is about HV710, and finally the finished product is polished, so that the design and the use requirements of the piston skirt are met. The ceramic alloy layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, melting the ceramic alloy through laser beam scanning heating, and cooling and solidifying the ceramic alloy; the transition layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, enabling the inner layer of the ceramic alloy layer to be quickly fused with the surface layer of the piston skirt body through laser beam scanning heating, and then cooling and solidifying.
The piston skirt with the ceramic alloy layer has no obvious interface with the piston skirt body, and the ceramic alloy layer can never fall off in the working process of the piston skirt, and has high hardness, wear resistance and good corrosion resistance. As shown in fig. 3 and 4, the hardness of the gray cast iron of the piston skirt body is about HV230, after ceramic alloying, a new ceramic alloy layer is formed, the depth of the layer is more than 0.6mm, and the hardening layer is more than the alloy layer above HV 713.
Gray cast iron friction wear performance test as shown in fig. 10; FIG. 11 test of frictional wear properties after ceramization of the gray cast iron surface. The test results show that: the relative wear resistance of the cast iron piece after the laser surface is ceramic is improved by more than 90 percent compared with that of the untreated cast iron piece. In the actual working process of the piston skirt, the ceramic alloyed piston skirt can better improve the wear resistance, the high temperature resistance and the corrosion resistance.
The ceramic alloy layer and the transition layer are alloying hardening layers and are composed of ultra-fine martensite with high hardness and ledeburite. The ceramic alloy layer can be of any thickness, is selected according to working condition requirements, is purely chemically combined, is directly melted on the body, and can not fall off. And the environment is not polluted, and the environment is more friendly. After ceramic alloying, a new ceramic alloy layer is formed, the depth of the layer is more than 0.6mm, and the hardening layer is more than the alloy layer above HV 713.
The test results show that: the relative wear resistance of the cast iron piece after the laser surface is ceramic is improved by more than 90 percent compared with that of the untreated cast iron piece.
Example 2. Laser ceramic alloy piston skirt (see figure) of the present invention, having a piston skirt body, characterized in that: the outer surface of the piston skirt is provided with a ceramic alloy layer, the ceramic alloy coating contains elements such as chromium, silicon, boron and the like, the piston skirt body is made of alloy cast iron, the ceramic alloy is sprayed on the working surface of the outer circle of the piston skirt in advance, and under the action of a high-energy high-density laser beam, the alloy cast iron on the surface of the piston skirt is quickly heated and melted, and is quickly cooled and solidified to form a chilled alloyed hardened layer. A transition layer is arranged between the ceramic alloy layer and the outer circle of the piston skirt body, and the transition layer is an alloying hardening layer which is formed by rapid cooling and solidification of ceramic alloy after the ceramic alloy rapidly and uniformly enters the piston skirt body. The alloyed hardened layer is composed of ultra-fine martensite with high hardness, ledeburite. The ceramic alloy layer can be of any thickness and is selected according to working condition requirements. When the alloying coating has higher chromium, silicon and boron contents, the chromium, silicon and boron contents of the alloying layer are obviously improved compared with the base body. Therefore, after the surface of the piston skirt is subjected to laser ceramic alloying treatment, the piston skirt not only has high hardness and wear resistance, but also has good corrosion resistance and high temperature resistance, and the comprehensive performance is that the wear resistance is generally improved by more than 2 times. The laser ceramic alloy piston skirt is provided with a piston skirt body, the upper end of the piston skirt body is provided with an annular bulge, and a sealing groove is arranged outside the annular bulge; the middle part of the piston skirt body is provided with an inward convex ring, bolt holes are uniformly distributed on the surface between the two ends of the piston skirt body along the circumferential direction, and the two symmetrical positions are also respectively provided with a threaded hole; the surface of the outer circle of the piston skirt body is provided with a ceramic alloy layer, and a transition layer is arranged between the ceramic alloy layer and the outer circle of the piston skirt body. The ceramic alloy layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, melting the ceramic alloy through laser beam scanning heating, and cooling and solidifying the ceramic alloy; the transition layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, enabling the inner layer of the ceramic alloy layer to be quickly fused with the surface layer of the piston skirt body through laser beam scanning heating, and then cooling and solidifying.
The invention has the greatest characteristics that the added coating and the base material perform full metallurgical action to form an alloying coating without obvious interface, and a transition layer for gradually transiting the ceramic alloy layer to the piston skirt body exists, so that high metallurgical bonding strength between the alloying coating and the base material is ensured. Pure chemical combination is directly melted on the body, and can not fall off. And the environment is not polluted, and the environment is more friendly.
Claims (8)
1. A laser ceramic alloy piston skirt is provided with a piston skirt body, which is characterized in that: the upper end of the piston skirt body is provided with an annular bulge, and a sealing groove is arranged outside the annular bulge; the middle part of the piston skirt body is provided with an inward convex ring, bolt holes are uniformly distributed on the surface between the two ends of the piston skirt body along the circumferential direction, and the two symmetrical positions are also respectively provided with a threaded hole; the surface of the outer circle of the piston skirt body is provided with a ceramic alloy layer, and a transition layer is arranged between the ceramic alloy layer and the outer circle of the piston skirt body.
2. A laser ceramic alloy piston skirt according to claim 1, wherein: the ceramic alloy layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, melting the ceramic alloy through laser beam scanning heating, and cooling and solidifying the ceramic alloy; the transition layer is formed by coating a layer of ceramic alloy on the outer circle surface of the piston skirt body in advance, enabling the inner layer of the ceramic alloy layer to be quickly fused with the surface layer of the piston skirt body through laser beam scanning heating, and then cooling and solidifying.
3. A laser ceramic piston skirt according to claim 1 or 2, wherein: the diameter of the piston skirt is 300-1080mm.
4. A laser ceramic alloy piston skirt according to claim 1 or 2, wherein: the piston skirt is applied to a marine low-speed diesel engine.
5. A laser ceramic alloy piston skirt as claimed in claim 3 wherein: the piston skirt is applied to a marine low-speed diesel engine.
6. A laser ceramic alloy piston skirt according to claim 1 or 2, wherein: the ceramic alloy layer and the transition layer can be also used for cylinder liners of low-speed diesel engines for ships, piston heads and other parts of the low-speed diesel engines for ships.
7. A laser ceramic alloy piston skirt as claimed in claim 3 wherein: the ceramic alloy layer and the transition layer can be also used for cylinder liners of low-speed diesel engines for ships, piston heads and other parts of the low-speed diesel engines for ships.
8. A laser ceramic alloy piston skirt according to claim 4, wherein: the ceramic alloy layer and the transition layer can be also used for cylinder liners of low-speed diesel engines for ships, piston heads and other parts of the low-speed diesel engines for ships.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410629826.8A CN118499145A (en) | 2024-05-21 | 2024-05-21 | Laser ceramic alloy piston skirt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410629826.8A CN118499145A (en) | 2024-05-21 | 2024-05-21 | Laser ceramic alloy piston skirt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118499145A true CN118499145A (en) | 2024-08-16 |
Family
ID=92238154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410629826.8A Pending CN118499145A (en) | 2024-05-21 | 2024-05-21 | Laser ceramic alloy piston skirt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118499145A (en) |
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2024
- 2024-05-21 CN CN202410629826.8A patent/CN118499145A/en active Pending
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