Preparation method of high-purity aluminum oxide ceramic and preparation method of ceramic product

Abstract

The invention relates to a preparation method of aluminum oxide ceramic, and in particular, relates to a preparation method of high-purity aluminum oxide ceramic, wherein the preparation method comprises the following steps: mixing aluminum oxide ceramic balls with various diameters; preparing alumina powder, wherein the mass ratio of the alumina powder to the alumina ceramic balls is 1:(1.5-3); adding the following auxiliary materials in percentage by weight: 0.5 to 2.5% of pseudo-boehmite, 0.1 to 0.3% of silica sol, 0.2 to 0.6% of magnesium oxide and 0.1 to 0.6% of yttrium oxide; adding alumina ceramic balls, alumina powder and auxiliary materials into a ball mill, adding 0.1%-0.5% of a dispersing agent, and carrying out wet ball milling for 20-30 h to obtain slurry; acidizing the slurrysubjected to ball milling; carrying out spray granulation on the acidified slurry to obtain high-purity aluminum oxide ceramic; homogenizing the high-purity aluminum oxide ceramic for 24-48 h in theenvironment with the temperature ranging from 20 DEG C to 45 DEG C and the humidity ranging from 40% to 65%, to obtain the high-purity aluminum oxide ceramic, wherein the aluminum oxide content of thehigh-purity aluminum oxide ceramic is not lower than 99.5%. The high-purity aluminum oxide ceramic is convenient to prepare, low in cost and good in ceramic performance.

Description

Technical field [0001] The invention relates to a preparation method of alumina ceramics, in particular to a preparation method of high-purity alumina ceramics and a preparation method of ceramic products. Background technique [0002] As a basic ceramic material, alumina ceramics are widely used in various industries with a series of properties such as good wear resistance, acid and alkali corrosion resistance, higher hardness, and flexural strength. With the development of science and technology, all walks of life have higher and higher performance requirements for basic materials. The alumina content of alumina ceramic products gradually increases from 75%, 85%, 95%, 99% to over 99.5%. [0003] With the increase of alumina content in ceramic materials, the sintering of alumina ceramic products has become more and more difficult, and the requirements for the sintering activity of alumina powder have also increased accordingly. However, the traditional method of preparing alumin...

AI Technical Summary

Problems solved by technology

However, the traditional method of preparing alumina powder can no longer keep up with the requirements of use. The minimum particle size of alumina powder prepared by traditional methods is between 1 and 2 microns. To prepare powders with D50 of about 0.5 microns, it is necessary to pass Chemical method or using sand mill for processing, the powder processing cost has increased significantly, resulting in the price of D50 0.5 micron and below powder is 2 to 10 times that of traditional alumina powder, the market is unacceptable, and it cannot be used on a large scale for the time being

[0004] Conventional 99 porcelain material density 3.85g / cm 3 About, the grain size is 10-20μm, the surface polishing finish is Ra0.4-0.8, the chemical corrosion resistance is poor, and the relevant technical performance requirements cannot be met

However, ceramic materials prepared by using high-purity ultra-fine powders are expensive in raw materials, expensive in final products, and poor in overall performance-to-price ratio.

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