CN110964949A - Sintering method of powder metallurgy lining of stainless steel substrate - Google Patents
Sintering method of powder metallurgy lining of stainless steel substrate Download PDFInfo
- Publication number
- CN110964949A CN110964949A CN201910933253.7A CN201910933253A CN110964949A CN 110964949 A CN110964949 A CN 110964949A CN 201910933253 A CN201910933253 A CN 201910933253A CN 110964949 A CN110964949 A CN 110964949A
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- CN
- China
- Prior art keywords
- sintering
- parts
- stainless steel
- powder
- powder metallurgy
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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
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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
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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
- B22F3/24—After-treatment of workpieces or articles
-
- 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
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/06—Alloys based on chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses a sintering method of a powder metallurgy lining of a stainless steel substrate, which comprises the following steps: 1) powder mixing: taking 0.5-2.0 parts of carbon, 14-24 parts of chromium, 14-22 parts of nickel, 0.5-3.0 parts of silicon and 0.5-1.0 part of iron according to the weight part ratio, and fully mixing; 2) molding: feeding the mixed powder into a die for molding; 3) and (3) sintering: continuously sintering the molded powder at 700 + -10 deg.C, 800 + -5 deg.C, 900 + -5 deg.C, 1150 + -10 deg.C, 1160 + -5 deg.C and 950 + -20 deg.C for 10-12min, 20-30min, 18-22min and 18-22 min; 4) and (3) cooling: cooling at-120 + -50 deg.C for 30 min; 5) tempering: tempering for 2h at 585 +/-50 ℃. According to the invention, through reasonable selection of material composition and proportion, reasonable selection of continuous sintering temperature and time, and matching with cooling and tempering processes, the workpiece can reach high hardness and high density, so that the performance of the workpiece is further improved.
Description
Technical Field
The invention relates to the field of valve seat rings, in particular to a sintering method of a powder metallurgy lining of a stainless steel substrate.
Background
Sintering, which means to convert the powdery material into a compact, is a traditional process. This process has long been used to produce ceramics, powder metallurgy, refractories, ultra high temperature materials, and the like. Generally, after the powder is shaped, the dense body obtained by sintering is a polycrystalline material whose microstructure is composed of crystals, vitreous bodies and pores. The sintering process directly affects the grain size, pore size and grain boundary shape and distribution in the microstructure, thereby affecting the performance of the material.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to sinter the powder of the stainless steel matrix to meet the performance requirement of the bushing.
In order to solve the technical problems, the invention provides the following technical scheme:
a powder metallurgy lining sintering method of a stainless steel matrix comprises the following steps:
1) powder mixing: taking 0.5-2.0 parts of carbon, 14-24 parts of chromium, 14-22 parts of nickel, 0.5-3.0 parts of silicon and 0.5-1.0 part of iron according to the weight part ratio, and fully mixing;
2) molding: feeding the mixed powder into a die for molding;
3) and (3) sintering: continuously sintering the formed powder at the temperature of 700 +/-10 ℃, 800 +/-5 ℃, 900 +/-5 ℃, 1150 +/-10 ℃, 1160 +/-5 ℃ and 950 +/-20 ℃ for 10-12min, 20-30min, 18-22min and 18-22 min;
4) and (3) cooling: cooling at-120 + -50 deg.C for 30 min;
5) tempering: tempering for 2h at 585 +/-50 ℃.
As a further scheme of the invention: in the step 1), 1 part of carbon, 16 parts of chromium, 18 parts of nickel, 2 parts of silicon and 1 part of iron are taken according to the weight part ratio and fully mixed.
As a still further scheme of the invention: the continuous sintering temperature in the step 3) is 700 ℃, 800 ℃, 905 ℃, 1140 ℃, 1155 ℃, 1165 ℃, 1160 ℃ and 970 ℃ for continuous sintering.
As a still further scheme of the invention: the continuous sintering time in the step 3) is as follows in sequence: 10min, 22min, 20min and 20 min.
As a still further scheme of the invention: the cooling method of the step 4) is cooling for 30min at-120 ℃.
As a still further scheme of the invention: the tempering method of step 5) is tempered for 2h at 585 ℃.
Compared with the prior art, the invention has the beneficial effects that: 1) the material performance of the sintered powder metallurgy lining is ensured by reasonably selecting the materials and the proportion of the powder;
2) a continuous sintering method is adopted, and the temperature and time of continuous sintering are reasonably selected, so that the performance of the workpiece is further improved;
3) and then, the cooling and tempering processes are matched, so that the workpiece can reach high hardness and high density, and the performance of the workpiece is further improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a powder metallurgy lining sintering method of a stainless steel matrix comprises the following steps:
1) powder mixing: taking 1 part of carbon, 16 parts of chromium, 18 parts of nickel, 2 parts of silicon and 1 part of iron according to the weight part ratio, and fully mixing;
2) molding: feeding the mixed powder into a die for molding;
3) and (3) sintering: continuously sintering the molded powder at the temperature of 700 deg.C, 800 deg.C, 905 deg.C, 1140 deg.C, 1155 deg.C, 1165 deg.C, 1160 deg.C and 970 deg.C for 10min, 22min, 20min and 20 min;
4) and (3) cooling: cooling at-120 deg.C for 30 min;
5) tempering: tempering at 585 ℃ for 2 h.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A powder metallurgy lining sintering method of a stainless steel matrix is characterized by comprising the following steps:
1) powder mixing: taking 0.5-2.0 parts of carbon, 14-24 parts of chromium, 14-22 parts of nickel, 0.5-3.0 parts of silicon and 0.5-1.0 part of iron according to the weight part ratio, and fully mixing;
2) molding: feeding the mixed powder into a die for molding;
3) and (3) sintering: continuously sintering the molded powder at 700 + -10 deg.C, 800 + -5 deg.C, 900 + -5 deg.C, 1150 + -10 deg.C, 1160 + -5 deg.C and 950 + -20 deg.C for 10-12min, 20-30min, 18-22min and 18-22 min;
4) and (3) cooling: cooling at-120 + -50 deg.C for 30 min;
5) tempering: tempering for 2h at 585 +/-50 ℃.
2. The sintering method for powder metallurgy bushings of stainless steel substrates according to claim 1, characterized in that 1 part of carbon, 16 parts of chromium, 18 parts of nickel, 2 parts of silicon and 1 part of iron are taken in the ratio of parts by weight in step 1) and mixed well.
3. The method for powder metallurgy bushing sintering of stainless steel substrates according to claim 1, wherein the continuous sintering in step 3) is performed at temperatures of 700 ℃, 800 ℃, 905 ℃, 1140 ℃, 1155 ℃, 1165 ℃, 1160 ℃ and 970 ℃ in this order.
4. The method for powder metallurgy bushing sintering of stainless steel substrates according to claim 3, wherein the continuous sintering time in step 3) is, in order: 10min, 22min, 20min and 20 min.
5. The method for powder metallurgy bushing sintering of stainless steel substrates according to claim 1, characterized in that the cooling method of step 4) is cooling at-120 ℃ for 30 min.
6. The powder metallurgy bushing sintering process of stainless steel substrates according to claim 1, characterized in that the tempering process of step 5) is tempered at 585 ℃ for 2 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910933253.7A CN110964949A (en) | 2019-09-29 | 2019-09-29 | Sintering method of powder metallurgy lining of stainless steel substrate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910933253.7A CN110964949A (en) | 2019-09-29 | 2019-09-29 | Sintering method of powder metallurgy lining of stainless steel substrate |
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| Publication Number | Publication Date |
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| CN110964949A true CN110964949A (en) | 2020-04-07 |
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| CN201910933253.7A Pending CN110964949A (en) | 2019-09-29 | 2019-09-29 | Sintering method of powder metallurgy lining of stainless steel substrate |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676979A (en) * | 2011-03-15 | 2012-09-19 | 台耀科技股份有限公司 | Method for upgrading strength and hardness of powder metallurgy stainless steel |
| CN102909372A (en) * | 2011-08-03 | 2013-02-06 | 东睦新材料集团股份有限公司 | Manufacturing method for valve plate of compressor |
| CN107043885A (en) * | 2017-04-28 | 2017-08-15 | 张家港振江粉末冶金制品有限公司 | A kind of manufacture method of immediate action valve valve element |
-
2019
- 2019-09-29 CN CN201910933253.7A patent/CN110964949A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676979A (en) * | 2011-03-15 | 2012-09-19 | 台耀科技股份有限公司 | Method for upgrading strength and hardness of powder metallurgy stainless steel |
| CN102909372A (en) * | 2011-08-03 | 2013-02-06 | 东睦新材料集团股份有限公司 | Manufacturing method for valve plate of compressor |
| CN107043885A (en) * | 2017-04-28 | 2017-08-15 | 张家港振江粉末冶金制品有限公司 | A kind of manufacture method of immediate action valve valve element |
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Application publication date: 20200407 |
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