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MIM316 sintering process

A process and product technology, applied in the field of MIM316 sintering process, can solve the problems of bumps and scratches on the surface of the product, and achieve the effects of improving the degree of densification, solving the problem of low sintering hardness and wide sintering range.

Active Publication Date: 2021-10-26
东莞市华研新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, vacuum furnace sintered MIM316L products have low austenite hardness, and the general hardness is below 180HV. Under normal circumstances, the general hardness is only 110-140HV. Due to the current status of the MIM industry, the high-demand surface polished MIM parts are currently only 316 materials. It can meet the requirements of nearly full and dense polishing, but the low hardness makes the surface of the product easy to scratch, bruise and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of MIM316 sintering process, including the following steps: firstly carry out sintering in vacuum; then fill in low-pressure argon gas for sintering, sinter until the product becomes dense layer; then fill in high-pressure nitrogen gas, apply auxiliary pressure during sintering, make the product under pressure Further densification and cooling with argon.

[0036] In the step of filling in low-pressure argon gas for sintering until the product becomes a dense layer, the pressure of the argon gas is 10Kpa.

[0037] In the step of filling the low-pressure argon gas and sintering until the product becomes a dense layer, the sintering temperature is 1350°C.

[0038] In the step of filling in low-pressure argon gas and sintering until the product becomes a dense layer, the sintering time is 60 minutes.

[0039] In the step of filling high-pressure nitrogen, applying auxiliary pressure during sintering to make the product more dense under pressure, and using argon to ...

Embodiment 2

[0046] A kind of MIM316 sintering process, including the following steps: firstly carry out sintering in vacuum; then fill in low-pressure argon gas for sintering, sinter until the product becomes dense layer; then fill in high-pressure nitrogen gas, apply auxiliary pressure during sintering, make the product under pressure Further densification and cooling with argon.

[0047] The difference from Example 1 is that the pressure of the argon gas is 20Kpa during the subsequent sintering with low-pressure argon until the product becomes a dense layer.

[0048] The difference from Example 1 is that in the step of filling the low-pressure argon gas and sintering until the product becomes a dense layer, the sintering temperature is 1365°C.

[0049] The difference from Example 1 is that in the step of filling with low-pressure argon gas and sintering until the product becomes a dense layer, the sintering time is 100 minutes.

[0050] The difference from Example 1 is that the pressur...

Embodiment 3

[0057] A kind of MIM316 sintering process, including the following steps: firstly carry out sintering in vacuum; then fill in low-pressure argon gas for sintering, sinter until the product becomes dense layer; then fill in high-pressure nitrogen gas, apply auxiliary pressure during sintering, make the product under pressure Further densification and cooling with argon.

[0058] The difference from Example 1 is that the pressure of the argon gas is 40Kpa during the subsequent sintering with low-pressure argon until the product becomes a dense layer.

[0059] The difference from Example 1 is that in the step of filling the low-pressure argon gas and sintering until the product becomes a dense layer, the sintering temperature is 1385°C.

[0060] The difference from Example 1 is that in the step of filling with low-pressure argon gas and sintering until the product becomes a dense layer, the sintering time is 180 minutes.

[0061] The difference from Example 1 is that the pressur...

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Abstract

The invention relates to the technical field of sintering, in particular to an MIM316 sintering process which comprises the following steps: firstly, carrying out vacuum sintering; filling low-pressure argon gas for sintering until the product becomes a compact layer; filling high-pressure nitrogen gas, applying auxiliary pressure during sintering, so that the product is further densified under the pressure, and argon gas is used for cooling. According to the MIM316 sintering process, the compactness of powder metallurgy sintering is improved, meanwhile, the industrial problem that the sintering hardness of the austenitic stainless steel is too low is solved. The MIM316 sintering process is suitable for sintering 316 stainless steel and other austenitic stainless steel such as 304, and is wide in sintering range.

Description

technical field [0001] The invention relates to the technical field of sintering, in particular to a MIM316 sintering process. Background technique [0002] At present, vacuum furnace sintered MIM316L products have low austenite hardness, and the general hardness is below 180HV. Under normal circumstances, the general hardness is only 110-140HV. Due to the current status of the MIM industry, the high-demand surface polished MIM parts are currently only 316 materials. It can meet the requirements of nearly full and dense polishing, but the low hardness makes the surface of the product easy to scratch, bruise and other defects. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a MIM316 sintering process, which can effectively improve the sintering hardness of austenitic stainless steel. [0004] The present invention adopts following technical scheme: [0005] A kind of MIM316 sintering process, comprises the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10B22F3/14B22F3/15
CPCB22F3/1007B22F3/14B22F3/15
Inventor 刘荣徐旭辉
Owner 东莞市华研新材料科技有限公司
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