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Aluminum oxide ceramic coating and preparation method thereof

A technology of alumina ceramics and alumina, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of brittle fracture and the decrease of the toughness of alumina ceramic coating materials.

Pending Publication Date: 2019-03-08
陈涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the action of external load, the stress will concentrate at the tip of the gap, resulting in the decrease of the toughness of the alumina ceramic coating material and even brittle fracture

Method used

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  • Aluminum oxide ceramic coating and preparation method thereof
  • Aluminum oxide ceramic coating and preparation method thereof
  • Aluminum oxide ceramic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The present invention proposes a method for preparing alumina liquid ceramics with high hardness, high wear resistance and high safety. The main steps are as follows:

[0075] (1) Select the substrate

[0076] The selection of the substrate should choose materials with wide material sources, low cost, low cutting difficulty and high strength. If necessary, materials that can still maintain certain plasticity, wear resistance and toughness after high temperature and high heat treatment should be selected. Here we give examples including wood, bamboo, metal materials, cement materials, resin materials, glass materials, carbon fiber materials and other substrates.

[0077] (2) Pretreatment of the substrate: sandblasting or frosting

[0078]In order to allow the ceramic coating raw material and the substrate to be more closely combined, the substrate needs to be sandblasted or frosted. This step greatly increases the roughness of the substrate surface. During plasma arc ...

Embodiment 2

[0105] A method for preparing aluminum oxide liquid ceramics, comprising the steps of:

[0106] (1) Select the substrate

[0107] Determine the substrate for aluminum oxide liquid ceramic spraying. The selection of the substrate should be based on a wide range of materials with suitable cost, low cutting difficulty and high strength. If necessary, it should still maintain a certain degree of plasticity and Abrasion-resistant and tough material.

[0108] (2) Pretreatment of the substrate: sandblasting (frosting) treatment

[0109] Described blasting treatment refers to:

[0110] Use compressed air to beat the sand to the surface of the substrate in a sandblasting machine, and the pressure of the compressed air is about 0.7MPa. When sandblasting is used to treat the surface of the substrate, the spray gun nozzle and the substrate form an angle of 45 degrees, and move at a constant speed from one end of the substrate to the other end. After sandblasting, use compressed air to ...

Embodiment 3

[0128] All the steps are the same as in Example 1 or Example 2, the difference is that the alumina raw material powder in the step (3) is also mixed with zirconia raw material powder, and the zirconia raw material powder is obtained by the following steps:

[0129] Dissolve quantitative urea and zirconium nitrate in deionized water to prepare a zirconium nitrate mixture; add 1 part of Span-80 to a container containing 10 parts of xylene, and use electric stirring during the addition of Span-80 Stir the xylene mixed solution in the container, and when the xylene mixed solution in the container becomes uniform, add 1 part of the prepared zirconium nitrate mixed solution to the container, and obtain a white emulsion after emulsification for half an hour. Pour the emulsion into the reaction kettle, seal the reaction kettle and put it in an oven at 120 degrees Celsius for reaction. After 15 hours of reaction, take out the reaction kettle and wait for it to cool to room temperature, ...

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Abstract

The invention belongs to the technical field of plasma arc spraying, and particularly relates to a high-hardness, high-wear-resistance and high-toughness aluminum oxide ceramic coating and a preparation method thereof. The method comprises the following steps that (1.1) a matrix is selected; (1.2) sand blasting or sanding pretreatment is carried out on the matrix; (1.3) aluminum oxide raw materialpowder is prepared; (1.4) the aluminum oxide nano-sintered powder is heated to a molten state; and (1.5) an aluminum oxide nano-liquid material is sprayed. The core step of the method is the molten step which before the aluminum oxide nano-liquid material is sprayed, a traditional aluminum oxide spraying technology is characterized in that aluminum oxide nano particles are directly placed into aspray gun for heating and spraying, and the combination effect cannot sufficiently meet a strength requirement and an adhesion degree requirement; and the sintered powder is melted into the molten state before feeding by the spray gun through the method, so that the defect is avoided, and the comprehensive parameters of the strength, hardness, toughness and the like of the ceramic coating are obviously better than the effect of a common spraying technology.

Description

technical field [0001] The invention belongs to the technical field of plasma arc spraying, and in particular relates to an alumina ceramic coating with high hardness, high wear resistance and high toughness and a preparation method thereof. Background technique [0002] In the field of industrial manufacturing and daily production, the surfaces and contact surfaces of most parts are the parts that are most likely to be damaged by friction and scratching, which will cause the function of the parts to fail, and eventually lead to the shutdown and scrapping of the entire device. With the leapfrog development of the second revolution of the global manufacturing industry, various production and processing equipment, assembled parts and other devices have higher and higher requirements for surface wear resistance, slip resistance, and scratch resistance. Obviously, if all the parts of a device as a whole use materials with excellent performance to improve the surface performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/02C04B35/10C04B35/622C04B35/626C04B35/638C04B35/64
CPCC04B35/10C04B35/622C04B35/62605C04B35/638C04B35/64C04B2235/3244C04B2235/6562C04B2235/6567C04B2235/661C23C4/02C23C4/11C23C4/134
Inventor 陈涛
Owner 陈涛
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