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Gasoline engine exhaust valve seat and preparation method thereof

A gasoline engine and exhaust valve technology, applied in the field of powder metallurgy, can solve the problems of cumbersome casting process, high cost, and large energy consumption of casting exhaust valve seats, and achieve the effect of uniform and fine microstructure, low cost and high operation

Active Publication Date: 2016-03-09
JIANGDU LEADER POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cast exhaust valve seat still has problems such as cumbersome process, large energy consumption, and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Weigh 60.84g of -200 mesh iron powder, 26.68g of -200 mesh ferrochrome powder, 32.52g of -200 mesh iron vanadium powder, 31.36g of -200 mesh iron molybdenum powder, 20g of 1μm tungsten carbide, 20g of 1μm titanium carbide, 7.6g of 20μm activated carbon, 1.0g of -200 mesh copper powder, prepared as mixed powder;

[0018] (2), above-mentioned mixed powder is mixed in ball mill 8h;

[0019] (3) Press the mixed powder under a pressure of 600MPa to form an exhaust valve seat green body with a compact density of 6.9g / cm 3 ;

[0020] (4), put the exhaust valve seat body in H 2 Sintered at 1150°C for 2 hours under atmospheric conditions, the density of the sintered body is 7.71g / cm 3 .

[0021] (5) Heat the sintered valve seat at 780°C for 1 hour, and then perform quenching treatment to obtain a powder metallurgy exhaust valve seat product with a hardness of 52HRC.

Embodiment 2

[0023] (1) Weigh 130.72g of -200 mesh iron powder, 13.34g of 320 mesh ferrochromium powder, 16.26g of 320 mesh iron vanadium powder, 15.68g of 320 mesh ferromolybdenum powder, 10g of 5μm tungsten carbide, 10g of 5μm titanium carbide, and 50μm activated carbon 3.8g, 0.2g of 320 mesh copper powder, prepared as mixed powder;

[0024] (2), above-mentioned mixing powder is mixed in ball mill 15h;

[0025] (3) Press the mixed powder under a pressure of 700MPa to form an exhaust valve seat body with a compact density of 7.2g / cm 3 ;

[0026] (4), put the exhaust valve seat body in H 2 Sintered at 1200°C for 1 hour under atmospheric conditions, the density of the sintered body is 7.76g / cm 3 .

[0027] (5) Heat the sintered valve seat at 820°C for 0.5h, and then perform quenching treatment to obtain a powder metallurgy exhaust valve seat product with a hardness of 54HRC.

Embodiment 3

[0029] (1) Weigh 100g of -200 mesh iron powder, 16g of -200 mesh ferrochrome powder, 24g of 320 mesh iron vanadium powder, 20g of -200 mesh iron molybdenum powder, 16g of 2μm tungsten carbide, 16g of 3μm titanium carbide, and 7.3g of 30μm activated carbon , 0.7g of 320 mesh copper powder, mixed into mixed powder;

[0030] (2), above-mentioned mixing powder is mixed in ball mill 12h;

[0031] (3) Press the mixed powder under a pressure of 650MPa to form an exhaust valve seat body with a compact density of 7.0g / cm 3 ;

[0032] (4), put the exhaust valve seat body in H 2 Sintered at 1180°C for 1 hour under atmospheric conditions, the density of the sintered body is 7.74g / cm 3 .

[0033] (5) Heat the sintered valve seat at 800°C for 1 hour, and then perform quenching treatment to obtain a powder metallurgy exhaust valve seat product with a hardness of 53HRC.

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Abstract

The invention provides a gasoline engine exhaust valve seat and a preparation method thereof, belonging to the technical field of powder metallurgy. By adding chromium, molybdenum, vanadium and other alloy elements to improve high temperature performance and stability, adding WC and TiC as hard phases to improve the wear resistance of the exhaust valve seat, adding Cu powder to improve the heat dissipation performance of the valve seat, after powder mixing, pressing, Sintering and heat treatment prepare the gasoline engine exhaust valve seat. The method has less energy consumption and low cost; the microstructure is fine and uniform, and it is easy to add various high melting point alloy elements and hard phase particles, and has excellent wear resistance, high temperature performance and stability; in addition, the process has high operational stability, The repeatability is strong, and the batch continuous production of the exhaust valve seat of the high-performance gasoline engine can be realized.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a method for preparing an exhaust valve seat of a gasoline engine. technical background [0002] The gas valve and valve seat are one of the four major friction pairs of the automobile engine, and its function is to control the intake of gas and the discharge of exhaust gas. When working, the valve seat is under high temperature conditions, subjected to the impact, beating and wear of the valve, as well as the scour and oxidation of the incoming and outgoing airflow, etc. The working conditions are extremely harsh, and severe wear, excessive sinking of the valve and poor air tightness often occur and other problems, resulting in a decrease in engine power. With the continuous increase of engine speed and gasoline compression ratio, the working conditions of the exhaust valve seat are getting worse and worse, and the valve seat material must have high wear res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/16
Inventor 葛莲叶青郭志猛
Owner JIANGDU LEADER POWDER METALLURGY
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