Method for producing aluminum oxide titanium white series multiple phase fine ceramics material

A technology of fine ceramics and alumina, which is applied in the field of preparing alumina/titanium oxide complex-phase fine ceramic materials, which can solve the problems of low density of ceramic green bodies, reduce production costs, and high sintering temperature, and achieve uniform quality and repeatability Good, reduce the effect of sintering temperature

Inactive Publication Date: 2008-05-07
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of high sintering temperature, long time, high energy consumption and low density of ceramic green body in the preparation process of fine ceramic materials, and to regranulate fine ceramic raw material powder (especially nano-scale powder) The problem of inhibiting grain growth in the process; and a method for preparing fine alumina / titanium oxide composite fine ceramic materials
The invention realizes the low-temperature rapid sintering of ceramics in the preparation process of fine ceramic materials, significantly reduces the production cost; solves the problem of grain growth in the regranulation process of fine ceramic raw material powder (especially nano-scale powder) and the ceramic biscuit The problem of low density

Method used

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  • Method for producing aluminum oxide titanium white series multiple phase fine ceramics material
  • Method for producing aluminum oxide titanium white series multiple phase fine ceramics material

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specific Embodiment approach 1

[0009] Specific embodiment one: the method for preparing alumina / titanium oxide complex phase fine ceramics in this embodiment is implemented according to the following steps: 1. Mix powder, deionized water, binder polyvinyl alcohol (PVA) and grinding balls Put it into the ball mill according to the mass ratio of 1:0.4~0.6:0.01~0.015:3~5, and mix it at 1000~1200rpm for 4~10h. The mixed powder is composed of 50~99% nano-alumina and 1-50% of nano-titanium oxide; 2. Spray-dry and re-granulate the slurry obtained after mixing step 1 to obtain a powder with a particle size of 20-80 μm, and the inlet temperature of the spray dryer is 210-240°C when it is working , the outlet temperature of the spray dryer is 100-120°C, and the nozzle speed of the spray dryer is 35000-37000r / min; 3. Put the regranulated powder into an alumina crucible and put it into a resistance furnace for heat treatment. The process is as follows: the heating rate during the heat treatment is 8-12°C / min; first, th...

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mixed powder in step 1 is composed of 60-99% of nano-alumina and 1-40% of nano-titanium oxide by mass percentage. Other reactions are the same as in Embodiment 1.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mixed powder in step 1 is composed of 70-97% of nano-alumina and 3-30% of nano-titanium oxide by mass percentage. Other reactions are the same as in Embodiment 1.

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Abstract

The invention relates to a method of producing alumina / titania system complex phase delicate ceramic material, and belongs to the technical field of high-performance ceramic production. The invention solves the problems that the sintering temperature is high, the time is long, the energy consumption is high, and the ceramics biscuit density is low during the production process of the delicate ceramic material, and the difficulties that the crystal grains are resisted to grow during the grain reproduction process of the delicate ceramics material powder (in particular to the nanometer grade powder body). The method comprises the steps as follows: using deionized water as the medium to mix delicate alumina and titania powder body and caking agent polyvinyl alcohol to the even sizing agent in a globe mill; then drying by a sprayer to reproduce the grain; subsequently conducting heat treatment to the got powder body so as to proceed the prepressing and the moulding; sintering after the biscuit is proceeded with the isostatic cool pressing moulding. The invention effectively resists the growth of the crystal grain during the grain reproduction process of the delicate ceramic material powder (in particular to the nanometer grade powder body). The method of the invention has low sintering temperature, low production cost, simple manufacturing and wide applying prospect. The density of the products of the invention reaches above 98 percent.

Description

technical field [0001] The invention belongs to the field of high-performance ceramics, and in particular relates to a method for preparing alumina / titanium oxide complex-phase fine ceramic materials. Background technique [0002] With the development of science and technology, especially the development of energy and space technology, the performance requirements of materials are getting higher and higher. Fine ceramic materials are an important part of modern material science and have broad prospects for commercial application. [0003] The currently widely used process route for preparing high-performance fine ceramics is: fine ceramic raw material powder → powder mixing → molding → sintering. In the process, the ceramic powder should generally be as fine as possible, which is conducive to high-temperature sintering and can reduce the sintering temperature. But this is not the case during forming, especially for dry pressing, the finer the particle size of the powder, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/117C04B35/46C04B35/622
Inventor 杨勇王铀
Owner HARBIN INST OF TECH
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