CN110548341A - Metal powder sintered filter element and preparation method thereof - Google Patents
Metal powder sintered filter element and preparation method thereof Download PDFInfo
- Publication number
- CN110548341A CN110548341A CN201910850248.XA CN201910850248A CN110548341A CN 110548341 A CN110548341 A CN 110548341A CN 201910850248 A CN201910850248 A CN 201910850248A CN 110548341 A CN110548341 A CN 110548341A
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- filter element
- metal powder
- powder
- sintered filter
- sintered
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- 239000000843 powder Substances 0.000 title claims abstract description 66
- 239000002184 metal Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005245 sintering Methods 0.000 claims description 10
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 7
- 238000007873 sieving Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 5
- 238000011001 backwashing Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 239000011812 mixed powder Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2027—Metallic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/12—Special parameters characterising the filtering material
- B01D2239/1291—Other parameters
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention aims to provide a preparation method of a metal powder sintered filter element, which is characterized in that metal tin powder with seams is added, high-pressure pressing is adopted in the pressing process, the ductility of tin is utilized to generate micro gaps, metal plays a supporting role, the metal is heated to the melting point of tin, and then the tin is thrown out to form the micro gaps. The metal powder filter element prepared by the invention has the advantages that the cross section area of the slit is larger than that of the hole of the traditional sintered filter element due to the generation of the slit, and the flow rate is increased; after high-pressure pressing, the fine seam is narrow, and the distance between metal powder of the filter element is small, so that the precision of the original sintered filter element can be improved; the cross section area of the sintered filter element gap is large, so that the sintered filter element gap has an excellent backwashing effect, and the service life of the sintered filter element gap is longer.
Description
Technical Field
The invention relates to the field of metal powder metallurgy products, in particular to a metal powder sintered filter element and a preparation method thereof.
Background
At present, the requirements of the whole filter industry on the filter material are that the filter flow is as large as possible, and the filter has very small filter resistance, so that the aim of reducing energy consumption is fulfilled. In practice, however, there is often a conflict with a conventional filter: under the condition of large filtering flux, the filtering precision is not high; and when the filtration precision is required to be improved, the filtration flux is reduced sharply. Meanwhile, the filter element with a common structure needs a large amount of equipment in special occasions such as petrochemical S-Zorb adsorption desulfurization devices, and the filter element is difficult to backwash due to the structure, so that the filter element is scrapped due to blockage after being used for about one year, and the normal operation of production is seriously influenced.
Disclosure of Invention
in order to overcome the defects in the prior art, the invention aims to provide a metal powder sintered filter element and a preparation method thereof.
in order to solve the technical problems, the invention adopts the following technical scheme:
A preparation method of a metal powder sintered filter element and the metal powder sintered filter element are characterized in that the filter element preparation process comprises the following steps:
(1) Screening metal powder: sieving filter element metal powder, wherein the granularity of the powder is-300 +1000 meshes; and (4) screening the seam-forming metal powder, wherein the granularity of the powder is-500 +1000 meshes.
(2) and (3) mixing, namely uniformly mixing the filter element powder and the seam forming metal powder in the step (1) in a weight ratio of (30 ~ 40) to 1.
(3) And (3) pressing, namely filling the mixture in the step (2) into a shaping mold, and pressing into a hollow cylindrical green blank under high pressure of 800 ~ 1000 MPa.
(4) And (3) sintering, namely, preserving the heat of the green body in the step (3) at 200 ~ 250 ℃ for 0.5 ~ 1 hour, then throwing the seam-forming molten metal out of the green body by centrifugation at the speed of 1000 ~ 1500r/min, and finally, preserving the heat of the green body at 1400 ~ 1800 ℃ for sintering for 0.5 ~ 1 hour, wherein the operations are all operated in a vacuum environment.
The filter element metal powder is austenitic stainless steel or duplex stainless steel.
The seam forming metal powder is tin.
a metal powder sintered filter element is prepared by the preparation method.
The average gap width of the filter element is 2.5 ~ 1.0.0 μm, and the length of the filter element is 20 ~ 40 μm.
the thickness of the filter element is 1 ~ 5mm, the length of the filter element is 50 ~ 1000mm, and the inner diameter of the filter element is 20 ~ 500 mm.
The invention has the beneficial effects that: the metal powder filter element prepared by the invention has the advantages that the cross section area of the slit is larger than that of the hole of the traditional sintered filter element due to the generation of the slit, and the flow rate is increased; after high-pressure pressing, the fine seam is narrow, and the distance between metal powder of the filter element is small, so that the precision of the original sintered filter element can be improved; the cross section area of the sintered filter element gap is large, so that the sintered filter element gap has an excellent backwashing effect, and the service life of the sintered filter element gap is longer.
Detailed Description
A preparation method of a metal powder sintered filter element is characterized by comprising the following steps:
(1) Metal powder sieving
Sieving filter element metal powder, wherein the granularity of the powder is-300 +1000 meshes;
Screening the seam-forming metal powder, wherein the granularity of the powder is-500 +1000 meshes;
(2) Mixing
Uniformly mixing the filter element metal powder and the seam forming metal powder in the step (1) in a weight ratio of (30 ~ 40) to 1;
(3) Pressing
filling the mixture obtained in the step (2) into a shaping mold, and pressing the mixture into a hollow cylindrical green body at a pressing pressure of 800-;
(4) Sintering
Keeping the temperature of the green blank in the step (3) at 200 ~ 250 ℃ for 0.5 ~ 1 hours, then throwing the seam-forming molten metal out of the blank body by centrifugation at the speed of 1000 ~ 1500r/min, and finally, keeping the temperature of the blank body at 1200 ~ 1400 ℃ for sintering for 0.5 ~ 1 hours, wherein the operations are all operated in a vacuum environment.
The metal powder of the filter element is austenitic stainless steel or duplex stainless steel.
The seam forming metal powder is metal with good ductility and low melting point, such as tin.
a metal powder sintered filter element is prepared by the preparation method.
The average gap width of the filter element is 2.5 ~ 1.0.0 μm, and the length of the filter element is 20 ~ 40 μm.
The thickness of the filter element is 1 ~ 5mm, the length of the filter element is 50 ~ 1000mm, and the inner diameter of the filter element is 20 ~ 500 mm.
The preparation method of the austenitic stainless steel powder sintered filter element comprises the following steps:
Sieving austenitic stainless steel powder, wherein the granularity of the powder is-300 +1000 meshes; and (4) screening the seam-forming tin powder, wherein the granularity of the powder is-500 +1000 meshes.
Mixing the austenitic stainless steel powder and the tin powder according to the weight ratio of 30: 1; mixing the above mixed powders respectively in a mixer for 50min to mix well.
filling the mixed powder into a qualitative mould, pressing into a hollow cylindrical green body, and pressing under 800 MPa.
Keeping the temperature of the green blank at 240 ℃ for 0.5 hour, melting the metal tin, and then throwing the tin liquid out of the blank body in a centrifugal mode, wherein the centrifugal speed is 1000 r/min; finally, the blank body is placed at 1500 ℃ for heat preservation and sintering for 0.5 hour; the above operations were all performed in a vacuum environment.
The prepared filter element has the average gap width of 2.5 ~ 1.0.0 mu m, the length of 20 ~ 40 mu m, the thickness of 1mm, the length of 50mm and the inner diameter of 20 mm.
The preparation method of the bidirectional stainless steel powder sintered filter element comprises the following steps:
Bidirectional stainless steel powder is sieved, and the granularity of the powder is-300 plus 1000 meshes; and (4) screening the seam-forming tin powder, wherein the granularity of the powder is-500 +1000 meshes.
Mixing the bidirectional stainless steel powder and the tin powder in a weight ratio of 40: 1; mixing the above mixed powders respectively in a mixer for 50min to mix well.
Filling the mixed powder into a qualitative mould, pressing into a hollow cylindrical green body, and pressing under 1000 MPa.
Keeping the temperature of the green blank at 240 ℃ for 1 hour, melting the metallic tin, and then throwing the tin liquid out of the blank body in a centrifugal mode, wherein the centrifugal speed is 1500 r/min; finally, the blank body is placed at 1500 ℃ for heat preservation and sintering for 1 hour; the above operations were all performed in a vacuum environment.
the prepared filter element has the average gap width of 2.5 ~ 1.0.0 μm, the length of 20 ~ 40 μm, the length of 500mm and the inner diameter of 250 mm.
The preparation method of the austenitic stainless steel powder and duplex stainless steel powder mixed sintered filter element comprises the following steps:
Sieving austenitic stainless steel powder, wherein the granularity of the powder is-300 +1000 meshes; and (4) screening the seam-forming tin powder, wherein the granularity of the powder is-500 +1000 meshes.
Mixing austenitic stainless steel powder and tin powder in a weight ratio of 35: 1; mixing the above mixed powders respectively in a mixer for 50min to mix well.
filling the mixed powder into a qualitative mould, pressing into a hollow cylindrical green body, and pressing under the pressure of 900 MPa.
Keeping the temperature of the green blank at 240 ℃ for 0.8 hour, melting the metal tin, and then throwing the tin liquid out of the blank body in a centrifugal mode, wherein the centrifugal speed is 1200 r/min; finally, the blank body is placed at 1500 ℃ for heat preservation and sintering for 0.8 hour; the above operations were all performed in a vacuum environment.
The prepared filter element has the average gap width of 2.5 ~ 1.0.0 μm, the length of 20 ~ 40 μm, the length of 1000mm and the inner diameter of 500 mm.
The prepared metal powder sintered filter element is arranged in an S-Zorb adsorption desulfurization device for test detection, wherein the table 1 shows the field filtering performance of the metal powder sintered filter element, and the table 2 shows the pressure difference comparison between a reactor and a filter in one period.
As can be seen from the table, the metal powder filter element prepared by the invention can simultaneously obtain high precision, high flux and excellent backwashing effect, and has longer service life.
TABLE 1
TABLE 2
Claims (6)
1. A preparation method of a metal powder sintered filter element is characterized by comprising the following steps:
(1) Metal powder sieving
Sieving filter element metal powder, wherein the granularity of the powder is-300 +1000 meshes;
Screening the seam-forming metal powder, wherein the granularity of the powder is-500 +1000 meshes;
(2) mixing
Uniformly mixing the metal powder of the filter element and the seam-forming metal powder in the step (1) according to the weight ratio of (30 ~ 40) to 1, (3) pressing
Filling the mixture obtained in the step (2) into a shaping mold, and pressing the mixture into a hollow cylindrical green body under high pressure, wherein the pressing pressure is 800 ~ 1000MPa and 1000 MPa;
(4) Sintering
and (3) preserving the heat of the green body in the step (3) at 200 ~ 250 ℃ for 0.5 ~ 1 hour, then throwing the seam-forming molten metal out of the green body by centrifugation at the speed of 1000 ~ 1500r/min, and finally, preserving the heat of the green body at 1400 ~ 1800 ℃ for sintering for 0.5 ~ 1 hour, wherein the operations are all operated in a vacuum environment.
2. The method of making a metal powder sintered filter element of claim 1, wherein: the filter element metal powder is austenitic stainless steel or duplex stainless steel.
3. The method of making a metal powder sintered filter element of claim 2, wherein: the seam forming metal powder is tin.
4. A metal powder sintering filter element is characterized in that: the filter element is prepared by the preparation method of any one of the claims 1 to 3.
5. the sintered metal powder filter element of claim 4, wherein said filter element has an average gap width of 2.5 ~ 1.0.0 μm and a length of 20 ~ 40 μm.
6. The sintered metal powder filter insert of claim 5, wherein said filter insert has a thickness of 1 ~ 5mm, a length of 50 ~ 1000mm, and an inside diameter of 20 ~ 500 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910850248.XA CN110548341A (en) | 2019-09-10 | 2019-09-10 | Metal powder sintered filter element and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910850248.XA CN110548341A (en) | 2019-09-10 | 2019-09-10 | Metal powder sintered filter element and preparation method thereof |
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| Publication Number | Publication Date |
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| CN110548341A true CN110548341A (en) | 2019-12-10 |
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| CN201910850248.XA Pending CN110548341A (en) | 2019-09-10 | 2019-09-10 | Metal powder sintered filter element and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167002A (en) * | 1996-06-03 | 1997-12-10 | 陆洪章 | Fluid filter element made of mixed-fibre and making method thereof |
| US20100287897A1 (en) * | 2009-05-12 | 2010-11-18 | Hyundai Motor Company | Receptacle filter for charging hydrogen |
| CN101945751A (en) * | 2007-12-20 | 2011-01-12 | 加州大学评议会 | Sintered porous structure and method of making same |
| CN102173857A (en) * | 2010-12-20 | 2011-09-07 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of mullite mesh ceramic foam filter |
| CN102642026A (en) * | 2011-02-22 | 2012-08-22 | 苏州市东方净水器厂 | Manufacturing process of metal powder sintered filter elements |
| CN103068771A (en) * | 2010-08-19 | 2013-04-24 | 日立金属株式会社 | Manufacturing method for ceramic honeycomb structure |
-
2019
- 2019-09-10 CN CN201910850248.XA patent/CN110548341A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167002A (en) * | 1996-06-03 | 1997-12-10 | 陆洪章 | Fluid filter element made of mixed-fibre and making method thereof |
| CN101945751A (en) * | 2007-12-20 | 2011-01-12 | 加州大学评议会 | Sintered porous structure and method of making same |
| US20100287897A1 (en) * | 2009-05-12 | 2010-11-18 | Hyundai Motor Company | Receptacle filter for charging hydrogen |
| CN103068771A (en) * | 2010-08-19 | 2013-04-24 | 日立金属株式会社 | Manufacturing method for ceramic honeycomb structure |
| CN102173857A (en) * | 2010-12-20 | 2011-09-07 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of mullite mesh ceramic foam filter |
| CN102642026A (en) * | 2011-02-22 | 2012-08-22 | 苏州市东方净水器厂 | Manufacturing process of metal powder sintered filter elements |
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Application publication date: 20191210 |
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