High-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring and manufacturing method thereof

A technology of iron-based powder metallurgy and engine valves, which is applied in the direction of manufacturing tools, metal processing equipment, furnace types, etc., can solve the problems of poor toughness of the valve seat blank body, poor long-term wear resistance, and short service life, and achieve improved Effects of strength and friction performance, improvement of toughness, and small difference in density

Inactive Publication Date: 2017-05-10
安徽马仪科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the valve seat ring has no oil lubrication in the working process, its weather resistance is poor, its service life is short, and its long-term wear resistance is poor. At present, there are few researches on the combination of adding hard particles, self-lubricating additives

Method used

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Comparison scheme
Effect test

Embodiment Construction

[0016] A high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat, made of the following raw materials in parts by weight: 6.2 chromium, 4.2 cobalt, 0.7 nickel, 0.5 titanium, 0.3 cerium, 18 copper, 1.2 nanometer molybdenum disulfide, carbonized Tungsten 0.7, manganese dioxide 1, methyltriethoxysilane 0.4, boron iron alloy powder 2.1, aluminum dihydrogen phosphate 0.2, polytetrafluoroethylene powder 2, iron 64.

[0017] A method for making a high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat, comprising the following steps:

[0018] (1) Add nano-molybdenum disulfide to aluminum dihydrogen phosphate aqueous solution with a mass concentration of 5-15%, disperse evenly by ultrasonic, add methyltriethoxysilane and heat to 50-70°C, stir for 12-24 hours and spray dry;

[0019] (2) Put the copper powder into the crucible resistance furnace and heat it up rapidly until it is completely melted, add the materials in step (1) and st...

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PUM

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Abstract

The invention discloses a high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring. The high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring is made from, by weight, 6.2-6.4 parts of chrome, 4.2-4.4 parts of cobalt, 0.7-0.9 part of nickel, 0.5-0.7 part of titanium, 0.3-0.5 part of cerium, 18-19 parts of copper, 1.2-1.5 parts of nano molybdenum disulfide, 0.7-0.9 part of tungsten carbide, 1-2 parts of manganese dioxide, 0.4-0.6 part of methyl triethoxy silane, 2.1-2.4 parts of ferro boron powder, 0.2-0.4 part of aluminum dihydrogen phosphate, 2-3 parts of polytetrafluoroethylene powder and 64-68 parts of iron. According to the high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat ring, the surface of the modified nano molybdenum disulfide is covered with a layer of copper film to be added into a matrix material as a solid lubricating agent; and meanwhile, manganese dioxide, titanium, cerium and other elements are added, the sintering, melt infiltration and heat treatment process is adopted to change the phase change of metal particles, and the manufactured product has high hardness and high high-temperature stability.

Description

technical field [0001] The invention relates to the technical field of automobile engine accessories, in particular to a high-hardness iron-based powder metallurgy self-lubricating CNG engine valve seat and a manufacturing method thereof. Background technique [0002] Compressed natural gas (CNG), liquefied petroleum gas (LPG) and methanol as alternative fuels for internal combustion engines are effective ways to protect the environment and use energy rationally. my country is rich in natural gas resources, and its market prospect as a clean fuel for engines is huge. However, with the use of new energy sources, the operating conditions of auto parts, especially engine valve seat rings, will change, and new requirements are put forward for their materials. The intake and exhaust valve seat rings of CNG engines are important working parts to control gas intake and exhaust gas discharge. Under high temperature, they are subjected to the erosion of air flow and high-frequency i...

Claims

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Application Information

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IPC IPC(8): C22C38/52C22C38/50C22C38/42C22C33/02B22F3/10B22F5/10B22F1/00B22F3/24C21D9/40C21D1/18
CPCC21D1/18C21D9/40C22C33/0214C22C33/0221C22C33/0228C22C33/0285C22C38/005C22C38/42C22C38/50C22C38/52B22F3/1035B22F3/24B22F5/106B22F2003/248B22F1/105
Inventor 周以林
Owner 安徽马仪科技股份有限公司
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