Method for increasing combination strength of plasma spraying ceramic coat and substrate

A technology of ceramic coating and bonding strength, which is applied in coating, metal material coating process, fusion spraying, etc., and can solve the problems of reducing the service life of the coating, the effect is small, and the bonding strength of the coating and the substrate is low.

Inactive Publication Date: 2008-07-09
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bonding strength between the coating and the substrate is low, generally about 30MPa, which reduces the service life of the coating and limits the applica

Method used

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  • Method for increasing combination strength of plasma spraying ceramic coat and substrate
  • Method for increasing combination strength of plasma spraying ceramic coat and substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Spray the NiCrAl bottom layer on the surface of the carbon steel substrate by plasma spraying method, and then use Cr 2 o 3 -8%TiO 2 Spraying the ceramic coating of the working layer;

[0029] (2) Put the above-mentioned sprayed carbon steel substrate into a furnace at 400° C. for 8 hours, and then cool with the furnace.

Embodiment 2

[0031] (1) Spray the NiCr bottom layer on the surface of the carbon steel substrate by plasma spraying method, and then use Al 2 o 3 -13%TiO 2 Spraying the ceramic coating of the working layer;

[0032] (2) Put the above-mentioned sprayed carbon steel substrate into a furnace at 450° C. for 6 hours, and then cool with the furnace.

Embodiment 3

[0034] (1) Spray the NiCrAl bottom layer on the surface of the carbon steel substrate by plasma spraying method, and then use ZrO 2 -8%Y 2 o 3 Spraying the ceramic coating of the working layer;

[0035] (2) Put the above-mentioned sprayed carbon steel substrate into a furnace at 450° C. for 4 hours, and then cool with the furnace.

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Abstract

The invention discloses a method for improving plasma sprayed ceramic coatings and base binding strength, which is sprayed ceramic coating fusion processing method. The method is that sceramic coatings which are prepared by plasma spraying are put in special environment which is 300-550 DEG C for 4-8 hours and then is cooled along with a stove. The coatings and a workpiece base are mutually diffused or are formed into a new phase, thereby playing a role of a transition layer between the coatings and the base. The bonding strength of the coatings and the base are improved by about 20 percent and is capable of meeting the application requirements for industries.

Description

1. Technical field [0001] The invention mainly relates to the field of steel surface coatings commonly used in industry, in particular to a method for improving the bonding strength of the steel surface and the plasma sprayed ceramic coating. 2. Background technology [0002] In recent years, plasma spraying technology has been widely used in various fields due to its excellent corrosion resistance and wear resistance. stress. The bonding strength between the coating and the substrate is low, generally about 30MPa, which reduces the service life of the coating and limits the application range of the coating. Therefore, people have been working on improving the bonding strength of coatings and substrates, but with little success. At present, the commonly used methods to improve the bonding strength between the coating and the substrate are: [0003] (1) Workpiece pretreatment includes different degrees of roughening treatment and preheating treatment on the surface of the ...

Claims

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Application Information

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IPC IPC(8): C23C4/08C23C4/10C23C4/18C23C4/073C23C4/11C23C4/134
Inventor 王泽华张晶晶林萍华吴玉萍
Owner HOHAI UNIV
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