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High-intensity alumina ceramic material and low temperature sintering method thereof

A technology of alumina ceramics and low temperature sintering, which is applied in the field of alumina ceramic materials and their manufacturing, can solve the problems of limited application scope, decrease in theoretical density of alumina ceramics, decrease in theoretical and relative density of 90 alumina ceramics, etc., so as to reduce sintering. Effect of temperature, surface wetting behavior improvement

Inactive Publication Date: 2011-06-15
NINGBO YUNSHENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simply introducing MgO and SiO2 as sintering aids into commercial alumina powder can promote its sintering and densification, but it often reduces the theoretical density of alumina ceramics while reducing the sintering temperature. The reason is that the adopted The density of glass powder is lower than that of alumina and because the pores are wrapped in the liquid phase during liquid phase sintering, the theoretical and relative density of 90 alumina ceramics are reduced, thus greatly limiting its application range

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Alumina powder is used as raw material of commercial high-purity alumina, and two kinds of alumina powder are selected as raw materials. The specific surface areas of alumina are 7m2 / g and 16 m2 / g respectively. The gradation selection of the two alumina powders is: 70wt% alumina powder with a specific surface area of ​​7m2 / g; 30wt% alumina powder with a specific surface area of ​​16 m2 / g. The composition of CaO-Al2O3-SiO2 eutectic point is selected as the basic formula as the additive, and ZrO2 and BaO are added on the basis of the basic formula. The composition is: 90wt% CaO-Al2O3-SiO2; 5wt% ZrO2, 5wt% BaO. The weight ratio of additives and alumina was 5 wt%. The above raw materials are blended according to the above-mentioned proportions, with absolute ethanol as the medium, the three are uniformly mixed, and then ball milled with high-purity alumina balls for 20 hours, dried and passed through a 200-mesh sieve. The prepared powder is formed by uniaxial 50 steel mol...

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PUM

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Abstract

The invention discloses a high-intensity alumina ceramic material, which consists of the following components in percentage by weight: A: 50 to 90 percent of alumina powder with the specific surface area of between 3 and 7 m<2> / g, B: 50 to 10 percent of alumina powder with the specific surface area of between 10 and 20 m<2> / g, D: 80 to 95 percent of CaO-Al2O3-SiO2 or BaO-Al2O3-SiO2 and E: ZrO2, BaO, SrO, HfO2 or Re2O3, wherein the mixture of C, D and E is in an amount which is 3 to 7 percent based on the total weight of the mixture of A and B. By the method, the theoretical density of 90 alumina ceramic is more than 3.8 g / cm<3> and the relative density is more than 99.5 percent; simultaneously, the mechanical property of alumina ceramic is not reduced, and sintering temperatures can be lowered.

Description

technical field [0001] The invention relates to an alumina ceramic material and a manufacturing method thereof. Background technique [0002] With the development of science and technology, especially the development of energy technology, space technology, automobile industry, etc., the requirements for materials are becoming more and more stringent, and it is urgent to develop various new high-performance structural materials. Alumina ceramics are widely used in electronics, machinery, chemical and other industries due to their high strength, high temperature resistance, good insulation, corrosion resistance, and good electromechanical properties. [0003] The preparation of high-performance alumina ceramics requires a high sintering temperature, and the production cost is high. In order to reduce the cost, the low-temperature sintering of ceramics usually introduces MgO, SiO2CaO or MAS, CAS, LAS and other glass powders as sintering aids. Simply introducing MgO and SiO2 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63C04B35/64C04B35/622C04B35/10
Inventor 李巨安蒋丹宇
Owner NINGBO YUNSHENG