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
2 Cites 9 Cited by

AI-Extracted 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 p...
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Method used

By adding metal elements such as chromium, manganese, nickel in 430L stainless steel powder raw material, greatly improved temperature resistance, corrosion resistance and compressive performance of product, confirmed by experiment, adopt technical scheme of the present invention, obtained The ...
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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.

Technology Topic

Powder metallurgyChromium +10

Examples

  • Experimental program(3)

Example Embodiment

[0032] Example 1
[0033] A stainless steel powder metallurgy key part of an automotive electronic vacuum pump, which is characterized in that its composition includes 0.9% manganese, 17% chromium, 0.4% silicon carbide, 0.02% sulfur, and the balance by weight percentage of stainless steel powder; The stainless steel powder is 430L stainless steel powder.
[0034] The preparation method is:
[0035] Ingredients: 0.9% manganese, 17% chromium, 0.4% silicon carbide, 0.02% sulfur, the balance is stainless steel powder according to the mass percentage; the above-mentioned components are processed or selected powders, powder particles of various components Diameters: 300-500 mesh for graphite, 100-500 mesh for manganese, 100-500 mesh for chromium, 100-500 mesh for silicon carbide, 100-500 mesh for sulphur, add the above-mentioned powders to the mixer and mix, and the mixing time is 50 minutes;
[0036] Forming, add the mixed powder into the mold at 80t/cm 2 Press for 10s under the pressure of, to make a pressed embryo;
[0037] Alloying and sintering, sintering the pressed blank at 1200-1280°C, and then cooling down to obtain the initial product.
[0038] Refining processing, the sintered initial product is refined to obtain a finished product.

Example Embodiment

[0039] Example 2
[0040] A stainless steel powder metallurgy key part of automotive electronic vacuum pump, which is characterized in that its composition includes 0.1% graphite, 2% manganese, 20% chromium, 10% nickel, 2.5% molybdenum, 0.7% carbonization by weight percentage. Silicon, 0.06% sulfur, the balance is stainless steel powder; wherein the stainless steel powder is 430L stainless steel powder.
[0041] The preparation method is:
[0042] Ingredients: 0.1% graphite, 2% manganese, 20% chromium, 0.06% nickel, 0.7% silicon carbide, 0.06% sulfur, and the balance is stainless steel powder by mass percentage; process or process the above components Select the powder, the particle size of each component powder 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 to the mixer and mix, the mixing time is 70min;
[0043] Forming, add the mixed powder into the mold at 80t/cm 2 Press for 10s under the pressure of, to make a pressed embryo;
[0044] Alloying and sintering, sintering the pressed blank at 1200-1280°C, and then cooling down to obtain the initial product.
[0045] Refining processing, the sintered initial product is refined to obtain a finished product.

Example Embodiment

[0046] Example 3
[0047] A stainless steel powder metallurgy key part of an automotive electronic vacuum pump, which is characterized in that its composition includes 0.2% graphite, 3% manganese, 25% chromium, 20% nickel, 5% molybdenum, and 1% carbonization. Silicon, 0.09% sulfur, the balance is stainless steel powder; wherein the stainless steel powder is 430L stainless steel powder.
[0048] The preparation method is:
[0049] Ingredients: 0.2% graphite, 3% manganese, 25% chromium, 20% nickel, 5% molybdenum, 1% silicon carbide, 0.09% sulfur, and the balance is stainless steel powder by mass percentage; Processing or selection of powder for each component, the particle size of each component powder 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-mentioned powders to the mixer and mix, the mixing time is 60min;
[0050] Forming, add the mixed powder into the mold at 80t/cm 2 Press for 8 seconds under the same pressure to form a pressed embryo;
[0051] Alloying and sintering, sintering the pressed blank at 1200-1280°C, and then cooling down to obtain the initial product.
[0052] Refining processing, the sintered initial product is refined to obtain a finished product.

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