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Thermal spraying engine valve seat ring wear-resistant coating and preparation method and use thereof

A technology of engine valves and wear-resistant coatings, which is applied in the direction of engine components, machines/engines, coatings, etc., can solve the problem that the wear resistance of the workpiece surface lubrication cannot meet the working conditions, etc., to eliminate local hot spots and improve Thermal conductivity, wear reduction effect

Inactive Publication Date: 2020-05-08
云南云内动力机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wear resistance of the workpiece and the surface lubrication of the workpiece still cannot meet the working conditions.

Method used

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  • Thermal spraying engine valve seat ring wear-resistant coating and preparation method and use thereof
  • Thermal spraying engine valve seat ring wear-resistant coating and preparation method and use thereof
  • Thermal spraying engine valve seat ring wear-resistant coating and preparation method and use thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0026] A preparation method of a thermally sprayed engine valve seat ring wear-resistant coating, comprising the following steps:

[0027] (1) Carry out the pretreatment of machining, sandblasting and cleaning on the valve seat to be sprayed, so that the surface roughness of the valve seat can reach Ra>6.4; The surface of the seat ring is clean, so that the surface roughness of the valve seat ring reaches Ra>6.4, which improves the bonding performance of the coating.

[0028] (2) Use the plasma spraying system to spray the wear-resistant coating one or more times to obtain a metal-ceramic composite wear-resistant coating with a uniform thickness, with a thickness of 300um~700μm;

[0029] (3) Perform honing and finishing on the valve seat ring coating obtained in step (2), and the thickness of the wear-resistant coating reaches 200um~500um.

[0030] Before spraying the wear-resistant coating, the metal powder and the ceramic powder are uniformly mixed and ball-milled to a part...

Embodiment 1

[0033] (1) Select 100g of metal and ceramic powder, and the preparation ratio of ceramic powder and metal powder is (mass fraction ratio): 40%, 60%. Among them, the metal powder is 5% Mo, 10% Co, 1% Cu, 9% W, 7% Ni, and the rest is Fe alloy powder, and the ceramic powder is silicon carbide (SiC);

[0034] (2) Mix the well-proportioned metal powder and ceramic powder evenly and ball-mill to a particle size of 20 μm;

[0035] (3) Machining, sandblasting and cleaning the surface of the valve seat, using ordinary quartz sand for sandblasting, so that the surface roughness of the valve seat can reach Ra>6.4;

[0036] (4) Adjust the plasma spraying process parameters and write the robot arm program;

[0037] (5) Without changing the above parameters, spray the valve seat ring to make the coating uniform;

[0038] (6) Finish the sprayed coating, and use a grinding machine to process the surface of the coating. The bonding strength of the coating prepared in this example is 15 MPa, ...

Embodiment 2

[0040] (1) Select 100g of metal and ceramic powder, and the preparation ratio of ceramic powder and metal powder is (mass fraction ratio): 1%, 99%. Among them, the metal powder is 1%Mo, 1%Co, 0.5%Cu, 7%W, 5%Ni, the rest is Fe alloy powder, and the ceramic powder is boron nitride (BN);

[0041] (2) Mix the well-proportioned metal powder and ceramic powder evenly and ball-mill to a particle size of 45 μm;

[0042] (3) The valve seat ring shall be machined, sandblasted, and pre-cleaned, and the sandblasted quartz sand shall be ordinary quartz sand, so that the surface roughness of the valve seat ring can reach Ra>6.4.

[0043] (4) Adjust the plasma spraying process parameters and write the robot arm program;

[0044] (5) Without changing the above parameters, rotate and spray the valve seat ring to make the coating uniform.

[0045] (6) Finish the sprayed coating, and use a grinding machine to process the surface of the coating. The bonding strength of the coating prepared in t...

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Abstract

The invention discloses a thermal spraying engine valve seat ring wear-resistant coating and a preparation method and use thereof. The purpose is to provide the thermal spraying engine valve seat ringwear-resistant coating with a simple process and the preparation method and use thereof. The wear-resistant coating is prepared from the following components in percentage by mass: 60-99% of metal powder and 1-40% of ceramic powder. The wear-resistant coating has high hardness and good adhesion performance, and can operate under high-temperature, high-scouring and high-pressure environments for along time without failure, falling off and other phenomena, and the wear-resistant performance is good.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a thermally sprayed engine valve seat ring wear-resistant coating, a preparation method and an application. Background technique [0002] The valve seat ring is an important part in the valve mechanism of the internal combustion engine. The valve seat ring avoids the direct contact between the valve and the cylinder head, and is used together with the valve to seal the combustion chamber and adjust the intake and exhaust. The valve seat ring absorbs part of the combustion heat and is the main path for the heat transfer from the valve to the cylinder head cooling water jacket. The traditional engine valve seat ring is produced by powder metallurgy, and its body is made of two materials, which has low strength, high manufacturing cost and complicated process. The material selection of the valve seat first and foremost must meet the hard conditions of service in high temperature, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/134F01L3/22
CPCC23C4/06C23C4/134F01L3/22
Inventor 李静文陈友才刘智杰吴威王润杨金美陈帅谭俊湘李建林李昊明
Owner 云南云内动力机械制造有限公司
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