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Gasoline engine exhaust valve seat and preparing method thereof

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

Active Publication Date: 2014-04-30
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 preparing method thereof and belongs to the technical field of powder metallurgy. The preparing method improves the high-temperature performance and the stability of the gasoline engine exhaust valve seat by adding alloy elements such as chromium, molybdenum and vanadium, the wearing resistance of the exhaust valve seat by adding WC and TiC which serve as the hard phase and the heat dissipation performance of the exhaust valve seat by adding Cu and comprises the steps of powder mixing, pressing, sintering and thermal treatment to prepare the gasoline engine exhaust valve. The preparing method of the gasoline engine exhaust valve seat is low in energy source consumption and cost; the gasoline engine exhaust valve seat is fine and uniform in microstructure and can be added with various high-melting-point alloy elements and hard phase granules conveniently to achieve excellent wearing-resistant, high-temperature and stability performance; besides, the preparation method of the gasoline engine exhaust valve seat is high in operating stability, strong in repeatability and capable of achieving continuous batch production of high-performance gasoline engine exhaust valve seats.

Description

Technical field [0001] The present invention belongs to the field of powder metallurgical technology, and specially provides a preparation method for gasoline exhaust valves. technical background [0002] The air valve and valve seat are one of the four major friction of the car engine. Its function is to control the inhalation of gas and the excretion of exhaust gas.When working, the valve seat is under high temperature conditions, and the impact, patting, wear, wear, and oxidation of the airflow of the air valve, and the inlet and airflow are extremely harsh.Waiting for problems, the engine power decreases.As the engine speed and gasoline compression ratio continues to increase, the working conditions of the exhaust valve seat are getting more and more deteriorated, and the valve seat material must have high abrasion resistance and high temperature stability. [0003] At present, the preparation process of the exhaust valve seat is mainly cast and powder metallurgy. The traditi...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/16
Inventor 葛莲叶青郭志猛
Owner JIANGDU LEADER POWDER METALLURGY
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