CN114951653A - Degreasing and sintering process for thin-sheet spiral-structure MIM (metal injection molding) part - Google Patents
Degreasing and sintering process for thin-sheet spiral-structure MIM (metal injection molding) part Download PDFInfo
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- CN114951653A CN114951653A CN202210586550.0A CN202210586550A CN114951653A CN 114951653 A CN114951653 A CN 114951653A CN 202210586550 A CN202210586550 A CN 202210586550A CN 114951653 A CN114951653 A CN 114951653A
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- Prior art keywords
- degreasing
- sintering
- release agent
- thin
- furnace
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- 238000005245 sintering Methods 0.000 title claims abstract description 54
- 238000005238 degreasing Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 title claims abstract description 10
- 238000001746 injection moulding Methods 0.000 title claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 16
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 6
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims abstract description 3
- 239000000758 substrate Substances 0.000 claims abstract description 3
- 229910052582 BN Inorganic materials 0.000 claims description 5
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical group N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011449 brick Substances 0.000 abstract 2
- 239000008187 granular material Substances 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a degreasing and sintering process for a thin-slice spiral-structure MIM (metal injection molding) part, which comprises the following steps of: s1: spraying a release agent, namely spraying the release agent on the surface of the green body subjected to injection molding so as to enable fine ceramic particles in the release agent to be uniformly attached to the surface of the green body; s2: degreasing, namely placing the degreased substrate in a degreasing furnace in an oxalic acid environment, and degreasing at the temperature of 120 ℃; s3: sintering, namely sintering the degreased product in a sintering furnace; in the degreasing step and the sintering step, crucibles filled with aluminum oxide powder are respectively placed in a degreasing furnace and a sintering furnace for supporting and placing parts. This application has avoided the tool of traditional degrease sintering process to support, prevents the adhesion on layer and layer through the spraying release agent to adopt aluminium oxide powder directly to support, be on the one hand it not take place adhesion or reaction with the unburned bricks, on the other hand aluminium oxide granule is tiny, can roll the effect that forms dynamic support thereupon along with the unburned bricks shrink, prevents to sink.
Description
Technical Field
The invention relates to the technical field of metal powder forming, in particular to a degreasing and sintering process for a thin-sheet spiral-structure MIM (metal injection molding) piece.
Background
Slice helical structure MIM spare is because of there being the helix angle, so helical structure end and adjacent sheet can form the space with the plane when sintering of keeping flat, and the sheet of space top can break off under self action of gravity because of lacking the support, and if not have the potsherd to support between each circle sheet, can take place to bond after the sintering, and traditional sintering process all adopts the tool to support, and the tool often the structure is complicated and with high costs, so if can directly realize the sintering without the tool and can improve the benefit greatly.
Disclosure of Invention
In order to overcome the defects in the prior art, the application provides a degreasing and sintering process for a thin-sheet spiral-structure MIM (metal injection molding) part, which comprises the following steps:
s1: spraying a release agent, namely spraying the release agent on the surface of the green body formed by injection molding so as to enable ceramic particles in the release agent to be uniformly attached to the surface of the green body and prevent the mutual adhesion of multiple layers of sheets in the degreasing and sintering processes;
s2: degreasing, namely placing the degreased substrate in a degreasing furnace in an oxalic acid environment, and degreasing at the temperature of 120 ℃;
s3: sintering, namely sintering the degreased product in a sintering furnace, wherein the sintering furnace adopts a hydrogen continuous sintering furnace or a metal furnace;
in the degreasing step and the sintering step, crucibles containing alumina powder are respectively placed in a degreasing furnace and a sintering furnace and used for supporting and placing parts.
Further, in the step S1, a release agent is sprayed on each surface of the green body with the spiral structure, wherein the release agent is a boron nitride release agent and is uniformly sprayed for 3-5 seconds.
Further, in the step S2 and the step S3, during the degreasing and sintering process, the alumina powder only supports the bottom of the product, and the particle size of the alumina powder is between 7 μm and 15 μm, and the powder in the particle size range is not only fine enough to ensure good roughness of the surface of the product, but also has good fluidity and air permeability, so as to ensure the degreasing and sintering effects.
Further, after sintering is finished, a blade is used for removing residual release agent along gaps of each layer structure of the part to obtain a complete product.
The application has the advantages that: the degreasing and sintering process of the MIM component with the sheet spiral structure avoids the support of a jig in the traditional degreasing and sintering process, and adopts alumina powder for direct support, so that on one hand, the alumina powder is not adhered or reacted with a green body, and on the other hand, the alumina particles are fine and can roll along with the shrinkage of the green body to form a dynamic support effect, thereby preventing collapse; in order to prevent the adhesion between layers, a solution was prepared using boron nitride, and then the layers were removed by spraying.
Drawings
FIG. 1 is a flow chart of the degreasing and sintering process for the thin spiral MIM component.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific examples.
Referring to fig. 1, the embodiment provides a degreasing sintering process for a thin-sheet spiral-structure MIM component, wherein the MIM component is a copper structure, the process firstly goes through the traditional feeding, mixing and injection processes, and then the surface of an injection-molded green body is sprayed with a release agent for demolding; after demolding, placing the product in a degreasing furnace in an oxalic acid environment, degreasing at the temperature of 120-140 ℃, wherein the acid introduction amount is 3-8 g/min, the degreasing time is not less than 8h, the weight loss rate after degreasing is not less than 8.5%, preferably, the acid introduction amount is 6g/min, the degreasing time is 8h, and the weight loss rate after degreasing is 8.5%; sintering in a hydrogen continuous sintering furnace or a metal furnace at 950-1080 ℃, wherein the sintering atmosphere can be selected from hydrogen or a mixed gas (10% -75%) of hydrogen and inert gas, the micro-positive pressure is realized, the highest temperature sintering time is not less than 120min, and the sintering temperature is preferably 1070 ℃; after sintering, slightly removing the residual demolding agent along the gaps of the slices by using a blade to obtain a complete slice spiral structure MIM (metal injection molding) component; in the degreasing and sintering steps, crucibles containing alumina powder are respectively placed in a degreasing furnace and a sintering furnace for supporting and placing parts.
Specifically, in the process of spraying the release agent, the release agent is boron nitride release agent, the main components are boron nitride, propane and butane, diatomite and the like, the release agent is sprayed on the surface of each layer of the green body with the spiral structure, and the layers are uniformly sprayed for 3-5 seconds.
Particularly, in the degreasing and sintering processes, the aluminum oxide powder only supports the bottom of a product, the granularity of the aluminum oxide powder is 7-15 microns, a part sprayed with a release agent is placed in a crucible containing the aluminum oxide powder, gaps exist among the tail end of a spiral structure, adjacent slices and a supporting plane, the slices are prone to breaking in the degreasing and sintering processes, the spiral structure is placed in the aluminum oxide powder crucible, the gaps at the bottom are filled with the aluminum oxide powder, the spiral structure MIM component is supported, the aluminum oxide powder with certain fluidity can be dynamically adjusted along with shrinkage changes of green bodies in the degreasing and sintering processes, uniform stress of the MIM component is always guaranteed, and finally a complete structure sample is obtained.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof.
Claims (6)
1. A degreasing sintering process for a thin-slice spiral-structure MIM (metal-insulator-metal) component is characterized by comprising the following steps:
s1: spraying a release agent, namely spraying the release agent on the surface of the green body subjected to injection molding so as to enable ceramic particles in the release agent to be uniformly attached to the surface of the green body;
s2: degreasing, namely placing the degreased substrate in a degreasing furnace in an oxalic acid environment, and degreasing at the temperature of 120-140 ℃;
s3: sintering, namely sintering the degreased product in a sintering furnace;
in the degreasing step and the sintering step, crucibles containing alumina powder are respectively placed in a degreasing furnace and a sintering furnace and used for supporting and placing parts.
2. The degreasing sintering process for the thin-sheet spiral-structured MIM component according to claim 1, wherein: in the step S1, a release agent is sprayed on each surface of the green body with the spiral structure.
3. The degreasing sintering process for the thin-sheet spiral-structured MIM component according to claim 2, characterized in that: the release agent is a boron nitride release agent and is uniformly sprayed for 3-5 s.
4. The degreasing sintering process for the thin-sheet spiral-structured MIM component according to claim 1, wherein: in the steps S2 and S3, the alumina powder supports only the bottom of the product during degreasing and sintering.
5. The degreasing sintering process for the thin-sheet spiral-structured MIM component according to claim 1, wherein: the granularity of the alumina powder is 7-15 mu m.
6. The process of claim 1, wherein the degreasing sintering of the thin-sheet spiral MIM component comprises: after sintering, the residual release agent is removed by a blade along the gaps of each layer structure of the part to obtain a complete product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210586550.0A CN114951653A (en) | 2022-05-26 | 2022-05-26 | Degreasing and sintering process for thin-sheet spiral-structure MIM (metal injection molding) part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210586550.0A CN114951653A (en) | 2022-05-26 | 2022-05-26 | Degreasing and sintering process for thin-sheet spiral-structure MIM (metal injection molding) part |
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| Publication Number | Publication Date |
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| CN114951653A true CN114951653A (en) | 2022-08-30 |
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| CN202210586550.0A Pending CN114951653A (en) | 2022-05-26 | 2022-05-26 | Degreasing and sintering process for thin-sheet spiral-structure MIM (metal injection molding) part |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6048432A (en) * | 1998-02-09 | 2000-04-11 | Applied Metallurgy Corporation | Method for producing complex-shaped objects from laminae |
| CN102274820A (en) * | 2011-07-04 | 2011-12-14 | 西北有色金属研究院 | Manufacturing method of isolation board for sintering |
| CN108607989A (en) * | 2018-04-11 | 2018-10-02 | 深圳艾利佳材料科技有限公司 | The ejection forming method of abnormal complex part |
| CN111872399A (en) * | 2020-08-22 | 2020-11-03 | 江苏精研科技股份有限公司 | Synchronous sintering method of titanium alloy or pure titanium product in powder injection molding |
| CN112811912A (en) * | 2021-01-20 | 2021-05-18 | 中国科学院上海硅酸盐研究所 | Batch sintering method of high-performance silicon nitride ceramic substrate |
| CN113695574A (en) * | 2020-07-07 | 2021-11-26 | 南京泉峰汽车精密技术股份有限公司 | Motor coil and preparation method thereof |
| CN114433846A (en) * | 2021-12-22 | 2022-05-06 | 南京泉峰汽车精密技术股份有限公司 | Fin-type heat dissipation plate and forming process thereof |
-
2022
- 2022-05-26 CN CN202210586550.0A patent/CN114951653A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6048432A (en) * | 1998-02-09 | 2000-04-11 | Applied Metallurgy Corporation | Method for producing complex-shaped objects from laminae |
| CN102274820A (en) * | 2011-07-04 | 2011-12-14 | 西北有色金属研究院 | Manufacturing method of isolation board for sintering |
| CN108607989A (en) * | 2018-04-11 | 2018-10-02 | 深圳艾利佳材料科技有限公司 | The ejection forming method of abnormal complex part |
| CN113695574A (en) * | 2020-07-07 | 2021-11-26 | 南京泉峰汽车精密技术股份有限公司 | Motor coil and preparation method thereof |
| CN111872399A (en) * | 2020-08-22 | 2020-11-03 | 江苏精研科技股份有限公司 | Synchronous sintering method of titanium alloy or pure titanium product in powder injection molding |
| CN112811912A (en) * | 2021-01-20 | 2021-05-18 | 中国科学院上海硅酸盐研究所 | Batch sintering method of high-performance silicon nitride ceramic substrate |
| CN114433846A (en) * | 2021-12-22 | 2022-05-06 | 南京泉峰汽车精密技术股份有限公司 | Fin-type heat dissipation plate and forming process thereof |
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