Natural gas engine powder metallurgy valve seat ring material

A powder metallurgy and valve seat technology, applied in the field of powder metallurgy valve seat materials for natural gas engines, can solve the problems of increased valve seat and valve wear, increased direct metal contact, poor working environment of the valve seat, etc. Wear resistance and the effect of meeting the requirements of working conditions

Active Publication Date: 2014-01-01
安庆帝伯粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The working environment of the valve seat of the existing natural gas engine is poor, and the oil mist lubrication and oxide film protection are almost lost. The metal direct contact between the valve seat and the valve is increased, and the wear of the valve seat and the valve is greatly increased. The original The material of the valve seat ring cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Valve seat ring material composition of the present invention is as follows:

[0018] element C S Cr Mo Ni co Cu mn V W Si margin Contentwt% 1.0 0.8 5 8 3 6 15 1 2 5 1 Fe

[0019] Production process: powder mixing → compression molding → sintering (copper penetration) → cold treatment → heat treatment

[0020] (1) Mix the raw material powder evenly in proportion; (2) Compress the mixed powder on a press; (3) Sinter the formed blank at high temperature in a sintering furnace and perform copper infiltration at the same time; (4) ) Cold treatment of the sintered blank with liquid nitrogen; (5) Heat treatment of the cold treated blank in a heat treatment furnace; (6) Machining into finished products.

Embodiment 2

[0022] Valve seat ring material composition of the present invention is as follows:

[0023] element C S Cr Mo Ni co Cu mn V W P margin Contentwt% 0.6 0.3 3 12 0.5 3 20 1 1 7 1 Fe

[0024] Production process: powder mixing → compression molding → sintering (copper penetration) → cold treatment → heat treatment

[0025] (1) Mix the raw material powder evenly in proportion; (2) Compress the mixed powder on a press; (3) Sinter the formed blank at high temperature in a sintering furnace and perform copper infiltration at the same time; (4) ) Cold treatment of the sintered blank with liquid nitrogen; (5) Heat treatment of the cold treated blank in a heat treatment furnace; (6) Machining into finished products.

Embodiment 3

[0027] Valve seat ring material composition of the present invention is as follows:

[0028] element C S Cr Mo Ni co Cu mn V W O margin Contentwt% 1.5 1.5 10 4 5 10 10 2.5 4 2 1 Fe

[0029] Production process: powder mixing → compression molding → sintering (copper penetration) → cold treatment → heat treatment

[0030] (1) Mix the raw material powder evenly in proportion; (2) Compress the mixed powder on a press; (3) Sinter the formed blank at high temperature in a sintering furnace and perform copper infiltration at the same time; (4) ) Cold treatment of the sintered blank with liquid nitrogen; (5) Heat treatment of the cold treated blank in a heat treatment furnace; (6) Machining into finished products.

[0031] Wear resistance test (test conditions: temperature 300°C, rotation speed 2500rpm, test time 10 hours, valve seat wear tester)

[0032] Valve Seat Material Valve seat ring wear mm Valve wear mm Total...

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PUM

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Abstract

The invention discloses a natural gas engine powder metallurgy valve seat ring material. The natural gas engine powder metallurgy valve seat ring material contains the following element raw materials in percentage by weight: 0.6-1.5% of C, 0.3-1.5% of S, 3-10% of Cr, 4-12% of Mo, 0.5-5% of Ni, 3-10% of Co, 10-20% of Cu, 1-2.5% of Mn, 1-4% of V, 2-7% of W and the balance of Fe. The natural gas engine powder metallurgy valve seat ring material disclosed by the invention can effectively improve the abrasion resistance of the powder metallurgy seat ring and meet the working conditions and the requirements of a natural gas fuel engine.

Description

technical field [0001] The invention relates to a natural gas engine powder metallurgy valve seat ring material. Background technique [0002] The working environment of the valve seat of the existing natural gas engine is poor, and the oil mist lubrication and oxide film protection are almost lost. The metal direct contact between the valve seat and the valve is increased, and the wear of the valve seat and the valve is greatly increased. The original The material of the valve seat ring cannot meet the requirements. Contents of the invention [0003] The purpose of the present invention is to provide a natural gas engine powder metallurgy valve seat material which can improve the wear resistance of the material. [0004] The natural gas engine powder metallurgy valve seat material of the present invention contains the following elemental raw materials in the mass ratio: C: 0.6-1.5%, S: 0.3-1.5%, Cr: 3-10%, Mo: 4-12% , Ni: 0.5-5%, Co: 3-10%, Cu: 10-20%, Mn: 1-2.5%, V: 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16C22C38/52
Inventor 李勇
Owner 安庆帝伯粉末冶金有限公司
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