Iron-based powder metallurgy valve seat of automobile engine

An iron-based powder metallurgy and automobile engine technology, which is applied to engine components, turbines, mechanical equipment, etc., can solve the problems of complex process, poor dimensional stability, and large volume change of products, so as to reduce manufacturing costs, improve wear resistance and The effect of corrosion resistance

Inactive Publication Date: 2019-10-01
孙荣华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, most of the valve seats of automobile engines adopt iron-based powder metallurgy technology, which overcomes the problems that the original alloy cast iron automobile engine valve seats are not wear-resistant, easy to crack, and have complicated processes.
The automobile engine of the prior art is processed by mixing Fe powder with C, Cu, Ni, W, Mo, Ti, zinc stearate, etc., stirring, pressing, and sintering. This automobile engine iron-based powder metallurgy valve seat High strength, wear resistance, not easy to crack, and simple process, but due to the addition of more precious non-ferrous metals such as Cu, Ni, W, Mo, the production cost is still high; in addition, the volume of the sintered product changes greatly, and the product Dimensional stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Fill the prefabricated mold with sealed, stirred and mixed alloy powder material with a particle size ≥ 100 mesh, and the ingredients are 1.6% C, 1% Cu, 2.5% Ni, 3% Cr, 0.8% W, 3% Mo by weight , 0.2% zinc stearate, and the rest is Fe powder; pressed into a billet at 7tf / ㎝²; the billet is sintered at a high temperature of 1130±5°C, kept in a reducing gas for 2.2h, and then cooled to room temperature through a water jacket .

Embodiment 2

[0022] Fill the prefabricated mold with alloy powder materials with particle size ≥ 100 meshes uniformly mixed by sealing and stirring, and the ingredients are 0.8% C, 1% Cu, 1% Ni, 0.6% W, 0.2% Mo, 3% Ti by weight , 0.2% zinc stearate, and the rest is Fe powder; pressed into a billet at 7tf / ㎝²; the billet is sintered at a high temperature of 1130±5°C, kept in a reducing gas for 2.2h, and then cooled to room temperature through a water jacket .

Embodiment 3

[0024] Fill the prefabricated mold with alloy powder materials with particle size ≥ 100 meshes that have been sealed and mixed uniformly, and the ingredients are 1.5% C, 1.5% Cu, 2% Ni, 0.9% W, 1% Mo, 4% Ti by weight , 0.8% zinc stearate, and the rest is Fe powder; pressed into a billet at 7tf / ㎝²; the billet is sintered at a high temperature of 1130±5°C, kept in a reducing gas for 2.2h, and then cooled to room temperature through a water jacket .

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PUM

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Abstract

The invention discloses an iron-based powder metallurgy valve seat of an automobile engine. The iron-based powder metallurgy valve seat comprises the following components of, in percentage by weight,0.8%-1.5% of C, 1%-1.5% of Cu, 1%-2% of Ni, 0.6%-0.9% of W, 0.2%-1% of Mo, 3%-4% of Ti, 0.2%-0.8% of zinc stearate, and the balance Fe powder. According to the valve seat, Ti is added in a iron-basedpowder metallurgy, the use amount of valuable non-ferrous metals such as Cu, Ni and Mo are reduced, so that the manufacturing cost is remarkably reduced, and meanwhile, the high dimensional stabilitycan also be obtained.

Description

technical field [0001] The invention relates to an automobile engine accessory and a manufacturing method thereof, more specifically, the invention relates to an automobile engine valve seat and a manufacturing method thereof. Background technique [0002] The valve seat of automobile engine is an important part of automobile engine. It needs to withstand high-frequency impact at high temperature in the cylinder head of the automobile engine. Therefore, the valve seat needs to have higher strength and better resistance to high temperature, wear and corrosion. performance. Nowadays, most of the valve seats of automobile engines adopt iron-based powder metallurgy technology, which overcomes the problems that the original alloy cast iron automobile engine valve seats are not wear-resistant, easy to crack, and have complicated processes. The automobile engine of the prior art is processed by mixing Fe powder with C, Cu, Ni, W, Mo, Ti, zinc stearate, etc., stirring, pressing, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/08C22C38/12C22C38/14C22C33/02B22F3/02B22F3/10B22F5/00
CPCB22F3/02B22F3/10B22F5/00C22C33/0264C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 孙荣华
Owner 孙荣华
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