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Stainless steel powder metallurgy key part of automobile electronic vacuum pump and preparation method of key part

An electronic vacuum pump and powder metallurgy technology, applied in the field of powder metallurgy, can solve the problems of powder metallurgy stainless steel limitations, low density, low corrosion resistance and low mechanical properties, and achieve the goal of improving temperature resistance, reducing sintering temperature and increasing density Effect

Active Publication Date: 2015-04-08
ANHUI HENGJUN POWDER METALLURGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, stainless steel powder is a pre-alloyed powder with high alloy content, which has high hardness and poor compressibility.
Therefore, there are pores inside the stainless steel parts produced by the traditional molding process, the density is often low, and its corrosion resistance and mechanical properties are generally lower than the corresponding dense stainless steel, which greatly limits the application of powder metallurgy stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A stainless steel powder metallurgy key part of an automotive electronic vacuum pump, characterized in that its composition includes, by weight percentage, 0.9% manganese, 17% chromium, 0.4% silicon carbide, 0.02% sulfur, and the balance is stainless steel powder; The stainless steel powder is 430L stainless steel powder.

[0034] Described preparation method is:

[0035] The ingredients are 0.9% manganese by mass percentage, 17% chromium, 0.4% silicon carbide, 0.02% sulfur, and the balance is stainless steel powder; the above-mentioned components are processed or selected as powder, and the powder particles of various components The diameter is: graphite 300-500 mesh, manganese 100-500 mesh, chromium 100-500 mesh, silicon carbide 100-500 mesh, sulfur 100-500 mesh, add the above powders to the mixer and mix them for 50 minutes;

[0036] Forming, adding the mixed powder into the mold at 80t / cm 2 Pressed under the pressure of 10s to make a pressed embryo;

[0037] Allo...

Embodiment 2

[0040] A stainless steel powder metallurgy key part of an automotive electronic vacuum pump, characterized in that its composition includes, by weight percentage, 0.1% graphite, 2% manganese, 20% chromium, 10% nickel, 2.5% molybdenum, and 0.7% carbonization Silicon, 0.06% sulfur, and the rest stainless steel powder; wherein the stainless steel powder is 430L stainless steel powder.

[0041] Described preparation method is:

[0042] The ingredients are 0.1% graphite by mass percentage, 2% manganese, 20% chromium, 0.06% nickel, 0.7% silicon carbide, 0.06% sulfur, and the balance is stainless steel powder; the above-mentioned components are processed or Choose powder, the powder particle size of various components is: graphite 300-500 mesh, manganese 100-500 mesh, chromium 100-500 mesh, nickel 100-500 mesh, molybdenum 100-500 mesh, silicon carbide 100-500 mesh, Sulfur 100-500 mesh, add the above powders into the mixer and mix, the mixing time is 70min;

[0043]Forming, adding t...

Embodiment 3

[0047] A stainless steel powder metallurgy key part of an automotive electronic vacuum pump, characterized in that its composition includes, by weight percentage, 0.2% graphite, 3% manganese, 25% chromium, 20% nickel, 5% molybdenum, and 1% carbonization Silicon, 0.09% sulfur, and the rest stainless steel powder; wherein the stainless steel powder is 430L stainless steel powder.

[0048] Described preparation method is:

[0049] Batching is 0.2% graphite by mass percentage, 3% manganese, 25% chromium, 20% nickel, 5% molybdenum, 1% silicon carbide, 0.09% sulfur, and the balance is stainless steel powder; Each component is processed or selected as powder. The powder particle size of each component is: graphite 300-500 mesh, manganese 100-500 mesh, chromium 100-500 mesh, nickel 100-500 mesh, molybdenum 100-500 mesh, silicon carbide 100-500 mesh, sulfur 100-500 mesh, add the above powders into the mixer and mix, the mixing time is 60min;

[0050] Forming, adding the mixed powder ...

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PUM

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Abstract

The invention relates to a stainless steel powder metallurgy key part of an automobile electronic vacuum pump and a preparation method of the key part. The stainless steel powder metallurgy key part is prepared from the following components in percentage by weight: 0-0.2% of graphite, 0.9-3% of manganese, 17-25% of chromium, 0-20% of nickel, 0-5% of molybdenum, 0.4-1% of silicon carbide, 0.02-0.09% of sulfur and the balance of stainless steel powder. The temperature resistance, the corrosion resistance and the pressure resistance of the product are greatly improved.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, in particular to key parts of stainless steel powder metallurgy for electronic vacuum pumps used in automobiles and a preparation method thereof. Background technique [0002] The electronic vacuum pump is mainly used in the brake system of automatic transmission vehicles, turbocharged engines and electric vehicles. It can reduce the operating force of the brake plate. It consists of pump chamber, pump chamber upper cover, pump body cover, pump core Shaft and other key components. However, at present, domestic automotive electronic vacuum pumps and their key components are basically imported, especially imported German products; , there is no mature product yet. As the country focuses on promoting the research and development of new energy vehicles and encourages the development of new energy vehicles, the braking system of electric vehicles cannot obtain vacuum from the engine because there is...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/58C22C38/44C22C38/38C22C38/22C22C38/18C22C33/02C22C1/05C22C30/00B22F3/16B22F1/00
Inventor 顾进文詹晓明疏金平毕军
Owner ANHUI HENGJUN POWDER METALLURGY TECH
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