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Gas engine valve seat ring material

A technology of engine valves and seat rings, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of reduced lubricity, low heat conversion efficiency, high explosion limit, etc., and achieves improved wear resistance and wear resistance The effect of volume increase

Inactive Publication Date: 2019-12-27
SHANDONG HUASHENG ZHONGTIAN MACHINERY GROUP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Compared with gasoline, natural gas has the characteristics of high ignition point, high explosion limit but low heat energy conversion efficiency, so natural gas will generate excessive heat energy after burning in the cylinder body, which will overheat the engine and cause the temperature of the combustion chamber to rise
At the same time, the lubricating oil will be oxidized due to the increase of temperature, which will reduce the lubricity and aggravate the wear.
Gasoline engines are now the mainstream in the market. Gasoline has the above-mentioned opposite characteristics compared to natural gas, so the requirements for valve seat materials are relatively low, so that the industry's general components cannot meet the requirements of high wear resistance after high temperature in the combustion chamber of gas engines.

Method used

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  • Gas engine valve seat ring material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] The present invention has designed the gas valve seat ring material of various formulas, and carries out wear rate test to different materials, and its specific formula is as follows table 1:

[0017] Table 1 raw material formula

[0018]

[0019] The raw materials of the formulas in the above examples are produced by traditional techniques, that is, one-time molding and one-time sintering, that is, powder mixing→press molding→sintering→heat treatment→finished product, the sintering temperature is 1200-1250°C, and the wear rate test is carried out on the obtained materials. The specific test The conditions are:

[0020] Testing machine: high temperature valve seat wear testing machine, rotation speed: 2500rpm; test temperature: intake air 200°C, exhaust air 300°C; test time: 9hr. The specific results are shown in Table 2 below:

[0021] Table 2 Test results of wear amount of traditional craft products

[0022]

[0023] The raw materials of the formulas of the a...

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PUM

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Abstract

The invention discloses gas engine valve seat ring material. The material is made from the following raw materials of, in percentage by weight, 0.9%-1.4% of C, 4.5%-8.0% of Ni, 3.5%-5.5% of Cr, 6.0%-9.0% of Mo, 15%-23% of Co, and balance Fe. According to the material, the content components of Ni, Co, Mo and Cr are adjusted, the interaction between hard particles and other components in the material is increased, and meanwhile, the processing technology is changed into "two-time forming two-time sintering" from the traditional "one-time forming one-time sintering", so that the abrasion resistance of the material is greatly improved, and the material is suitable for a gas engine.

Description

technical field [0001] The invention relates to a gas engine valve seat ring material. Background technique [0002] Compared with gasoline, natural gas has the characteristics of high ignition point, high explosion limit but low heat energy conversion efficiency. Therefore, after natural gas is burned in the cylinder body, excessive heat energy will be generated, which will overheat the engine and cause the temperature of the combustion chamber to rise. At the same time, the lubricating oil will be oxidized due to the increase of temperature, which will reduce the lubricity and aggravate the wear. Gasoline engines are now the mainstream in the market. Because gasoline has the above-mentioned opposite characteristics compared to natural gas, the requirements for valve seat ring materials are relatively low, so that the industry's common components cannot meet the high wear resistance requirements of gas engine combustion chambers after high temperature. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/52C22C33/02F01L3/22
CPCC22C33/0278C22C33/0285C22C38/44C22C38/52F01L3/22
Inventor 刘乃孟
Owner SHANDONG HUASHENG ZHONGTIAN MACHINERY GROUP