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MIM sintering process of 316L stainless steel

A stainless steel and process technology, applied in the field of MIM sintering process, can solve the problems of increased cost and inability to solve the sintering problem of products with special structures

Active Publication Date: 2021-03-02
广东精研科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is indeed effective for products with simple sintered structures, but it does not fundamentally improve the sintering deformation problem, and cannot solve the sintering problems of some special structure products, such as structures with thin or long necks, Z-shaped structures, etc.; and follow-up increase The shaping process will cause new process problems, resulting in increased costs

Method used

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Embodiment Construction

[0028] The present invention will be described below in conjunction with specific embodiments.

[0029] A kind of MIM sintering process of 316L stainless steel comprises the following steps:

[0030] Step 1, prepare 316L stainless steel feed: mix stainless steel powder and binder at a ratio of 9:1, knead evenly, and then put the obtained mixture into a feed crusher to obtain uniform granular feed;

[0031] Step 2, injection molding: molding the feed material obtained in step 1 in an injection molding machine to obtain an injection blank of expected structure;

[0032] Step 3, decoration: place the injection blank obtained in step 2 on the special ceramic jig 1 as required;

[0033] Step 4, degreasing: put the product described in step 3 together with the ceramic jig into a special degreasing furnace for degreasing to obtain a degreasing part;

[0034] Step 5, sintering: Put the degreased part made in step 4 into a sintering furnace for sintering to obtain a 316L stainless st...

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Abstract

The invention discloses an MIM sintering process of 316L stainless steel. The MIM sintering process comprises the following steps: (1) preparation of 316L stainless steel feeds: stainless steel powderand a binding agent are mixed according to a ratio of 9:1 for uniform mixing; and the obtained mixture is put in a feed crusher to prepare granular feeds with uniform sizes; (2) injection molding; (3) piece arrangement; (4) degreasing; (5) sintering; (6) piece arrangement by rotating a plate; and (7) secondary sintering: semi-sintered pieces prepared in the step (6) and a ceramic tool 2 are put in a sintering furnace in the step (5) for secondary sintering to prepare 316L stainless steel products without deforming and breaking. According to the sintering principle, the sintering process and the ceramic support mode are optimized, so that the sintering deformation problem is improved essentially; the sintering difficulties of some products with special structures are solved; and the production cost is reduced to a certain extent.

Description

technical field [0001] The invention relates to the technical field of stainless steel, in particular to a MIM sintering process of 316L stainless steel. Background technique [0002] Metal Injection Molding (MIM for short) is to mix metal powder and binder to prepare powder metallurgy feed material with certain plasticity and fluidity, injection molding with injection machine, and then remove the bond by catalytic degreasing Agent, and then use high temperature sintering to obtain dense MIM products. The obtained MIM products have the advantages of uniform structure, high strength, high precision, good corrosion resistance, good surface finish, and mass production. In recent years, MIM technology has gradually matured, and stainless steel such as 316L and 17-4PH have been widely used in industry. [0003] The problem of sintering deformation has always been a technical problem in the MIM industry. In response to this problem, the current improvement measures for the MIM p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10B22F3/22
CPCB22F3/225B22F3/1017B22F3/101
Inventor 杨健长杨云党黄志立刘礼华
Owner 广东精研科技发展有限公司
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