Powder-metallurgic valve seat ring of CNG engine

A valve seat ring, powder metallurgy technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of reduced air tightness of valves, reduced engine efficiency, etc., to increase density, optimize metal phase transformation, and stabilize heat The effect of hardness

Inactive Publication Date: 2017-04-19
ANHUI HENGJUN POWDER METALLURGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the valve seat ring is impacted and worn, the airtightness of the valve will be reduced, which will greatly reduce the engine efficiency, and a large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] CNG engine powder metallurgy valve seat is composed of the following raw material components in mass percentage: Co 4%, Cu13.5%, Mo 6.7%, Ni 0.8%, Cr 5%, W 3%, Y 2 o 3 0.25%, the balance is base material iron; the preparation process of the valve seat adopts solid phase alloy sintering, nitrogen and decomposed ammonia gas are introduced as protective atmosphere, and the heat treatment adopts cryogenic tempering process.

[0012] The formula and process principle of the present embodiment are as follows:

[0013] 1. Rare earth Y is added to raw materials 2 o 3 , Change the phase transition of metal particles, improve the toughness, wear resistance, and thermohardness of the seat ring, and reduce the sintering temperature by 50-70°C during the manufacturing process, increase the sintering rate by about 20%, and reduce production energy consumption.

[0014] 2. Solid-phase alloy sintering is adopted, and nitrogen gas and decomposed ammonia gas are introduced as a prote...

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PUM

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Abstract

The invention discloses a powder-metallurgic valve seat ring of a CNG engine, which is composed of, by mass, 3.5-4.5% of Co, 12-15% of Cu, 6-7.5% of Mo, 0.5-1.2% of Ni, 4.5-5.5% of Cr, 2.5-3.5% of W, 0.2-0.3% of Y2O3, and the balanced being a base material, iron. The valve seat ring is produced through the process of solid phase alloying sintering, wherein nitrogen gas and cracked ammonia gas are fed as a protective atmosphere. A copious cooling tempering process is used in thermal treatment. The valve seat ring is improved in toughness, wear resistance, thermal hardening property, thermal conductivity and coefficient of linear expansion under constant high temperature. Density of the valve seat ring is improved by controlling effective sintering temperature and sintering rate.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a CNG engine powder metallurgy valve seat ring. Background technique [0002] The intake and exhaust valve seat rings of CNG engines are important working parts to control gas intake and exhaust gas discharge. During the working process, they will withstand the erosion of airflow and high-frequency impact and friction of valves at high temperatures, and the working conditions are very harsh. Once the valve seat ring is impacted and worn, the airtightness of the valve will be reduced, which will greatly reduce the engine efficiency, and a large amount of harmful components such as incompletely combusted nitrogen, sulfur, hydrogen, oxygen compounds and carbon-containing PM2.5 gases will be emitted. Contents of the invention [0003] The purpose of the present invention is to provide a CNG engine powder metallurgy valve seat, improve the seat ring toughness, wear resistance, therm...

Claims

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Application Information

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IPC IPC(8): C22C38/52C22C38/42C22C38/44C22C33/02F01L3/02B22F3/10C21D9/40
CPCB22F3/1007B22F2999/00C21D9/40C22C33/0278C22C38/42C22C38/44C22C38/52F01L3/02B22F2201/02B22F2201/016
Inventor 詹晓明疏金平张克庆
Owner ANHUI HENGJUN POWDER METALLURGY TECH
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