Hot spray coating anti-crack-expansion aluminum oxide ceramic composite coating material and use method thereof

A technology of alumina ceramics and composite coatings, applied in the field of ceramic wear-resistant coatings, can solve the problems of microcracks, high brittleness and low toughness of thermal spray coating materials, etc., to solve microcracks, reduce volume shrinkage, and prepare low cost effect

Inactive Publication Date: 2018-06-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention aims to solve the problems of high brittleness and low toughness of alumina-based ceramic thermal spraying coating materials, and microcracks are easily generated during the spraying process

Method used

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  • Hot spray coating anti-crack-expansion aluminum oxide ceramic composite coating material and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The thermal spraying anti-crack propagation alumina ceramic composite coating material is prepared from the following raw materials, 65g of strengthening agent, 30g of loosening agent, and 5g of healing agent, wherein the strengthening agent is aluminum oxide powder, the loosening agent is copper, and the healing agent is dioxide Zirconium powder.

[0022] The use method of the thermal spraying anti-crack propagation alumina ceramic composite coating material is to sieve the strengthening agent, the loosening agent and the healing agent respectively, then mix the strengthening agent and the healing agent evenly, and then send the loosening agent into two feeders respectively. In the powder machine, the powder is fed to carry out thermal spraying on the sprayed substrate, and an anti-crack propagation alumina ceramic composite coating material is obtained on the surface of the sprayed substrate.

[0023] The above method of use, the specific process is:

[0024] Step 1....

Embodiment 2

[0027] The thermal spraying anti-crack propagation alumina ceramic composite coating material is prepared from the following raw materials, 40g of strengthening agent, 40g of loosening agent, and 20g of healing agent, wherein the strengthening agent is alumina powder, the loosening agent is copper, and the healing agent is dioxide Zirconium powder.

[0028] The use method of the thermal spraying anti-crack propagation alumina ceramic composite coating material is to sieve the strengthening agent, the loosening agent and the healing agent respectively, then mix the strengthening agent and the healing agent evenly, and then send the loosening agent into two feeders respectively. In the powder machine, the powder is fed to carry out thermal spraying on the sprayed substrate, and an anti-crack propagation alumina ceramic composite coating material is obtained on the surface of the sprayed substrate.

[0029] The above method of use, the specific process is:

[0030] Step 1. Perfo...

Embodiment 3

[0033] The thermal spraying anti-crack propagation alumina ceramic composite coating material is prepared from the following raw materials, 60g of strengthening agent, 32g of loosening agent, and 8g of healing agent, wherein the strengthening agent is alumina powder, the loosening agent is NiAl, and the healing agent is dioxide Zirconium powder.

[0034] The use method of the thermal spraying anti-crack propagation alumina ceramic composite coating material is to sieve the strengthening agent, the loosening agent and the healing agent respectively, then mix the strengthening agent and the healing agent evenly, and then send the loosening agent into two feeders respectively. In the powder machine, powder-feeding thermal spraying is carried out on the surface of the substrate in step 1 to obtain an anti-crack propagation alumina ceramic composite coating material.

[0035] The above method of use, the specific process is:

[0036] Step 1. The surface of the substrate (cast iron...

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Abstract

The invention relates to a hot spray coating anti-crack-expansion aluminum oxide ceramic composite coating material and a use method thereof, and belongs to the technical field of a ceramic wear-resistant coating. The hot spray coating anti-crack-expansion aluminum oxide ceramic composite coating material is prepared from the following raw materials including 40 to 65 weight parts of reinforcing agents, 30 to 40 weight parts of loosening agents and 5 to 20 weight parts of healing agents, wherein the reinforcing agents are aluminum oxide powder; the loosening agents are copper, NiAl or NiCr; the healing agents are zirconium dioxide powder; the reinforcing agents, the loosening agents and the healing agents are respectively sieved; then, the reinforcing agents and the healing agents are uniformly mixed; the mixture and the loosening agents are respectively fed into two powder conveying devices; powder is conveyed for performing hot spray coating on a spray coating base body; the anti-crack-expansion aluminum oxide ceramic composite coating material is obtained on the surface of the spray coating base body. The invention aims at solving the problems that the aluminum oxide-based ceramic hot spray-coating coating material has high brittleness and low toughness, and microcracks can be easily generated in the spray coating process.

Description

technical field [0001] The invention relates to a thermal spraying anti-crack propagation alumina ceramic composite coating material and a method for using the same, belonging to the technical field of ceramic wear-resistant coatings. Background technique [0002] Alumina thermal spraying ceramic coatings are widely used in aerospace, mechatronics, medical and chemical industries due to their low density, high temperature resistance, corrosion resistance, high hardness, wear resistance, and good chemical stability. However, the crystal structure of alumina ceramics belongs to the corundum type, which is combined by strong directional ionic bonds and covalent bonds, resulting in its own high brittleness and low toughness, and microcracks are prone to occur during high-temperature spraying. This characteristic restricts alumina ceramics. Practical applications of materials. [0003] Zirconia has a phase change volume change characteristic of shrinking when heated up and expan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C22C29/12
CPCC23C4/06C22C29/12
Inventor 宋鹏李乔磊吕凯月陈榕陆建生
Owner KUNMING UNIV OF SCI & TECH
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