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Method for preparing high-temperature wear-resistant alumina-ceramic based composite coating

A technology of alumina ceramics and composite coatings, applied in coatings, metal material coating processes, molten spraying, etc., can solve the problems of easy expansion and cracks, etc., and achieve low preparation costs, simple operation process, The effect of low operator requirements

Active Publication Date: 2019-01-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is: the problem that cracks are easily generated and cracks are easy to expand during the high-temperature wear process of alumina-based thermal spraying ceramic coatings

Method used

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  • Method for preparing high-temperature wear-resistant alumina-ceramic based composite coating
  • Method for preparing high-temperature wear-resistant alumina-ceramic based composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw materials and parts by weight used in the method described in this embodiment are: 55 parts by weight of a stabilizer, 30 parts by weight of a binder, and 15 parts by weight of a reinforcing agent, wherein the stabilizer is AT40, the binder is Al, and the reinforcing agent is zirconia.

[0024] In this embodiment, the preparation and application method of thermal spraying high-temperature wear-resistant alumina ceramic matrix composite coating is based on aluminum alloy, and the specific method is as follows:

[0025] (1) The surface of the substrate is roughened by sandblasting, and then the sandblasting surface is cleaned with dry air. The sand material used in the rough sandblasting process is zirconium corundum with a particle size of 15-30 μm.

[0026] (2) Weigh 55g AT40, 30g Al, and 15g zirconia, crush the materials by mechanical ball milling, and pass through a 325-mesh mechanical vibrating sieve.

[0027] (3) Fully mix 55g AT40 and 15g zirconia powder pr...

Embodiment 2

[0030] The raw materials and parts by weight used in the method described in this embodiment are: 80 parts by weight of a stabilizer, 17 parts by weight of a binder, and 3 parts by weight of a reinforcing agent, wherein the stabilizer is alumina, the binder is Cu, and the reinforcing agent is YSZ.

[0031] The preparation and application method of thermal spraying high-temperature wear-resistant alumina ceramic matrix composite coating in this embodiment uses copper alloy as the substrate, and the specific method is as follows:

[0032] (1) The surface of the substrate is roughened by sandblasting, and then the sandblasting surface is cleaned with dry air. The sand material used in the rough sandblasting process is zirconium corundum with a particle size of 15-30 μm.

[0033] (2) Weigh 80g of alumina, 3g of YSZ, and 17g of Cu, crush the materials by mechanical ball milling, and pass through a 325-mesh mechanical vibrating sieve.

[0034] (3) Fully mix 80g of alumina and 3g of ...

Embodiment 3

[0037] The raw materials and parts by weight used in the method described in this embodiment are: 70 parts by weight of a stabilizer, 20 parts by weight of a binder, and 10 parts by weight of a reinforcing agent, wherein the stabilizer is AT40, the binder is NiAl, and the reinforcing agent is boron carbide.

[0038] The preparation and application method of thermal spraying high-temperature wear-resistant alumina ceramic-based composite coating in this embodiment uses cast iron as the substrate, and the specific method is as follows:

[0039] (1) The surface of the substrate is roughened by sandblasting, and then the sandblasting surface is cleaned with dry air. The sand material used in the rough sandblasting process is zirconium corundum with a particle size of 15-30 μm.

[0040] (2) Weigh 70g of AT40, 20g of NiAl, and 10g of boron carbide, crush the materials by mechanical ball milling, and pass through a 325-mesh mechanical vibrating sieve.

[0041] (3) Fully mix 70g of AT...

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Abstract

The invention discloses a method for preparing a high-temperature wear-resistant alumina-ceramic based composite coating and belongs to the field of hot-spray ceramic coating materials. The method disclosed by the invention comprises the steps of adding a reinforcer in a stabilizer, then, carrying out uniform mixing, adjusting parameters of spraying equipment, feeding powder together with an adhesive by a powder feeder, carrying out hot spraying, and subjecting the stabilizer to complete melting and the reinforcer to partial melting during spraying, thereby obtaining the high-temperature wear-resistant alumina-ceramic based composite coating. Part of unmelted reinforcer particles are present in the high-temperature wear-resistant alumina-ceramic based composite coating prepared by the method, the production of microcracks is inhibited during wearing of the coating or the extension direction of the microcracks is changed during the wearing of the coating, the toughness of the coating isenhanced, the wear resistance of the coating is improved, and the service life of the high-temperature wear-resistant alumina-ceramic based composite coating is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature wear-resistant alumina ceramic matrix composite coating, which belongs to the field of thermal spraying ceramic coating materials. Background technique [0002] Alumina thermal spraying ceramic coatings are widely used in aerospace, transportation and other high-temperature and wear-resistant fields due to their advantages such as high temperature resistance, corrosion resistance, high hardness, wear resistance, and good chemical stability. However, the crystal structure of the alumina ceramic material 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. Microcracks or microcracks expand during high temperature wear and become the cause of its wear failure. The main reason is that this characteristic seriously affects the service life of alumina ceramic materials. [0003] Aiming ...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/11
CPCC23C4/11C23C4/12
Inventor 宋鹏李乔磊黄太红陆建生
Owner KUNMING UNIV OF SCI & TECH
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