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A kind of multilayer structure aluminum oxide composite ceramics and preparation method thereof

A composite ceramic, multi-layer structure technology, applied in chemical instruments and methods, ceramic layered products, lamination and other directions, can solve the problems of poor reliability and lubricity, hinder practical application, low stability, etc., achieve high reliability, Excellent thermal shock resistance, low friction and wear effect

Active Publication Date: 2019-02-26
YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, it is found that the problems of low stability, reliability and poor lubricity of ceramics still exist, which seriously hinder their practical application as wear-resistant sealing parts.

Method used

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  • A kind of multilayer structure aluminum oxide composite ceramics and preparation method thereof
  • A kind of multilayer structure aluminum oxide composite ceramics and preparation method thereof
  • A kind of multilayer structure aluminum oxide composite ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Alumina particles can be obtained by ball milling 90 g of alumina powder with a particle size range of 100-200 mesh, 5 g of tetragonal polycrystalline zirconia and 5 g of sintering aids (4 g of titanium dioxide and 1 g of copper oxide) in an alcohol medium for 24 hours. Ultrafine alumina composite powder with a diameter of 50 nm to 200 nm; obtained by wet ball milling the above 70.0 g ultrafine alumina composite powder, 29.5 g deionized water and 0.5 g binder (polyvinyl alcohol) for 10 hours Alumina slurry: the mixed alumina slurry was tape-cast, and dried at room temperature to obtain an alumina spacer layer with a thickness of 1.2 mm.

[0038]Put 7.0 g of colloidal graphite, 2.8 g of deionized water, and 0.2 g of polyvinyl alcohol into a ball mill jar, and carry out wet ball milling for 10 hours to obtain a slurry composed of colloidal graphite and binder; the above composite slurry was spray-dried Granulation to prepare large-particle spherical graphite lubricant pow...

Embodiment 2

[0041] 94.5 g of alumina, 4 g of titanium dioxide, 1 g of copper oxide and 0.05 g of graphene with a particle size range of 100-200 mesh were ball-milled in an alcohol medium for 25 hours to obtain ultrafine aluminum oxide particles with a particle size of 50 nm to 200 nm. Alumina composite powder; the above 70.0 g ultrafine alumina composite powder, 29.5 g deionized water and 0.5 g polyvinyl alcohol were wet ball milled for 10 hours to obtain alumina slurry; the mixed alumina slurry was flown After stretching and drying at room temperature, an aluminum oxide spacer layer with a thickness of 0.35 mm was obtained.

[0042] 7.0 g of colloidal graphite, 2.8 g of deionized water and 0.2 g of polyvinyl alcohol were packed into a ball mill jar, and wet ball milled for 10 hours to obtain a slurry composed of colloidal graphite and binder; the above-mentioned composite slurry was produced by spray drying granules to prepare large-particle spherical graphite lubricant powder; heat-trea...

Embodiment 3

[0045] 95 g of alumina with a particle size range of 100-200 mesh, 4 g of titanium dioxide and 1 g of copper oxide are ball milled in an alcohol medium for 24 hours to obtain an ultrafine alumina composite powder with a particle size of 50 nm to 200 nm ; The above 70.0 g ultrafine alumina composite powder, 29.5 g deionized water and 0.5 g polyvinyl alcohol were wet ball milled for 12 hours to obtain alumina slurry; the mixed alumina slurry was cast and dried at room temperature Finally, an aluminum oxide spacer layer with a thickness of 0.45 mm was obtained.

[0046] 7.0 g of colloidal graphite, 2.8 g of deionized water and 0.2 g of polyvinyl alcohol were packed into a ball mill jar, and after 10 hours of wet ball milling, a slurry composed of colloidal graphite and binder was obtained; the above-mentioned composite slurry was produced by spray drying granules to prepare large-particle spherical graphite lubricant powder; the large-particle spherical graphite lubricant powder ...

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Abstract

The invention discloses a multilayer-structure aluminum oxide composite ceramic. The surface layer of the composite ceramic is an aluminum oxide-composite lubricant layer; the interlayer is an aluminum oxide layer of which the layer thickness ratio is 1:1 and the layer thickness is 150-1000 mu m; the aluminum oxide-composite lubricant layer is composed of 70-80 wt% of aluminum oxide and 20-30 wt% of a large-particle spherical composite lubricant; the large-particle spherical composite lubricant is graphite, barium sulfate, graphite-barium sulfate or graphite-calcium fluoride; and the aluminum oxide in the surface layer and interlayer respectively contains 5 wt% of a sintering aid. The invention also discloses a preparation method of the composite ceramic. The aluminum oxide composite ceramic has excellent processability, mechanical property (high toughness), reliability (high work of rupture), heat stability (high anti-thermal shock stability) and tribological property (low frictional wear).

Description

technical field [0001] The invention relates to a multilayer structure alumina composite ceramic and a preparation method thereof, and belongs to the technical field of design and preparation of service dynamic sealing composite materials in extreme environments. Background technique [0002] Sealing and leaking are one of the eternal subjects in the field of engineering, and are very common in life and industrial production. In the sealing device, the sealing element is its main part, and the material composition of the sealing element is the key to determine the sealing performance, and also the guarantee for the reliable and stable operation of the sealing system. In recent years, with the rapid development of my country's modern industry and high technology, the working conditions of the sealing device have become increasingly harsh, resulting in a short life of the sealing system and seriously affecting the normal operation of the equipment. At the same time, the leaka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/78C04B35/10C04B35/622C04B35/634B32B18/00B32B37/10B32B37/06
CPCB32B18/00B32B37/06B32B37/10B32B2264/10B32B2264/104B32B2264/108B32B2307/554B32B2307/558B32B2307/714B32B2581/00C04B35/10C04B35/622C04B35/63416C04B35/78C04B2235/3232C04B2235/3244C04B2235/3281C04B2235/425C04B2235/60C04B2235/9607C04B2235/9669
Inventor 张永胜宋俊杰胡丽天苏云峰樊恒中
Owner YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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