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Powder metallurgy valve seat and preparation method thereof

A powder metallurgy and valve seat technology, applied in the field of powder metallurgy valve seat and its preparation, can solve the problems of poor self-lubrication of castings, decrease of engine power, leakage of combustion gas, etc., so as to prolong the service life, reduce pollution and increase wear resistance. The effect of sex and lubricity

Inactive Publication Date: 2014-02-12
TONGLING GUOFANG PLUMBING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the material of the valve seat is usually made of chrome-molybdenum alloy cast iron, which has good mechanical properties, but the disadvantages are high production cost, material utilization rate of only 25-30%, large energy consumption, and poor self-lubrication of castings
Therefore, when unleaded gasoline is used for casting valve seats, abnormal wear will occur in a short period of time, resulting in combustion gas leakage, resulting in a decrease in engine power and polluting the environment.

Method used

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Embodiment Construction

[0016] specific implementation plan

[0017] The present invention will be described in detail below through specific examples.

[0018] A powder metallurgy valve seat made of the following raw materials in parts by weight (kg): copper 3.1, molybdenum 6.1, nickel 6.1, molybdenum disulfide 1.1, graphite 1.1, iron powder 86, Mg 7.2, Ti 3.5, V 1.2, Ta 0.52, Pd 0.1, additive 2;

[0019] The auxiliary agent is made of the following raw materials in parts by weight (kg): iron powder 30, aluminum hydroxide 2, zinc sulfate 1, medical stone 1, nano-carbon 1, jade 2, polyisobutylene 2, aluminate couple Coupling agent DL-411 1. Silicon carbide powder 2; the preparation method is to mix iron powder, aluminum hydroxide, zinc sulfate and medical stone, grind them into 200-300 mesh powder, and then add aluminate coupling agent DL-411 Mix evenly, press it into a blank at 10-15Mpa, then send it to 920-950°C for calcination for 3-4 hours, after cooling, crush it into 300-400 mesh powder, mix ...

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Abstract

The invention discloses a powder metallurgy valve seat, which is characterized in that the valve seat is made of the following raw materials in parts by weight: 3.1-3.2 parts of copper, 6.1-6.4 parts of molybdenum, 6.1-6.2 parts of nickel, 1.1-1.4 parts of molybdenum disulfide, 1.1-1.5 parts of graphite, 86-88 parts of iron powder, 7.2-7.4 parts of Mg, 3.5-3.8 parts of Ti, 1.2-1.5 parts of V, 0.52-0.66 parts of Ta, 0.1-0.2 parts of Pd and 2-3 parts of assistant. The graphite is added into the raw materials, so that the wear resistance and the lubricating property of a shaft sleeve are improved, and the manufactured shaft sleeve is compact in tissue, good in microstructure, very small in pore, and excellent in structural stiffness, hardness, fatigue performance and tensile strength; a process of adding lead powder is omitted, so that the pollution to the environment is reduced, the valve seat can be applied to a lead-free gasoline engine, and the service life of the valve seat is prolonged.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy valve seat and a preparation method thereof. Background technique [0002] The valve seat of an automobile engine is a key part that is frequently impacted and easy to wear in the engine. The general operating temperature of the valve seat is 600-700°C, and the instantaneous temperature can reach about 1000°C. And it works under the corrosion of compressed combustion gas. Therefore, the material of the valve seat must have the properties of wear resistance, high temperature resistance, corrosion resistance and fatigue resistance. At present, the material of the valve seat is usually made of chrome-molybdenum alloy cast iron, which has good mechanical properties, but the disadvantages are high production cost, material utilization rate of only 25-30%, high energy consumption, and poor self-lubrication of castings. Therefore, in the case of unleaded gasoline, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16
Inventor 许国荣
Owner TONGLING GUOFANG PLUMBING TECH
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