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Composite powder of zirconia in high square phase and alumina and preparation method

A technology of phase zirconia and zirconia fine powder, which is applied in the field of zirconia-alumina composite powder and its preparation, can solve the problems of low tetragonal phase content and large amount of water adsorbed on the surface, so as to increase the tetragonal phase content and improve compatibility properties, and the effect of reducing the amount of adsorbed water

Inactive Publication Date: 2006-05-24
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to meet the need for high-tetragonal zirconia powder when preparing high-concentration and low-viscosity slurries for ceramics, the present invention solves the problems of low tetragonal phase content and large surface adsorption water in zirconia powder in the prior art, and proposes a A kind of high tetragonal phase zirconia-alumina composite powder and its preparation method

Method used

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Experimental program
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Effect test

Embodiment 1

[0021] 100g of zirconia fine powder containing 5.21% (weight ratio) of yttrium oxide with a particle size of 30-50nm was added to 200g of water and stirred to prepare a suspension; 36.76g of Al(NO 3 ) 3 ·10H 2 O is prepared into an aqueous solution with a concentration of 20% by mass; mix the two, slowly titrate the ammonia under stirring, and slowly adjust the pH value from 3 to 4 to 8 to 10, during the process Al(NO 3 ) 3 Al(OH) is formed 3 Precipitate uniformly on the surface of zirconia, keep the pH value at 8-10 for 1 hour, filter, wash the powder to neutral, suction filter, dry and heat treatment, the temperature rise rate is 100℃ / h, and the temperature is 280℃ for 0.5 hours. , And then continue to heat up to 1050°C and keep for 2 hours to obtain the high tetragonal phase zirconia-alumina composite powder of the present invention, the particle size is 100-200nm, and the tetragonal phase zirconia content is about 75-80 of the total zirconia %, the content of zirconia containi...

Embodiment 2

[0023] Add 100g of 3mol% yttria-containing zirconia fine powder with a particle size of 30-50nm to 200g of water and stir to prepare a suspension; add 94.7g of AlCl 3 ·6H 2 O is prepared into an aqueous solution with a concentration of 40% by mass; mix the two, slowly titrate the ammonia under stirring, and slowly adjust the pH to 8-10. During the process, AlCl 3 Al(OH) is formed 3 Precipitate uniformly on the surface of zirconia, keep the pH value at 8-10 for 1 hour, filter, wash the powder to neutral, suction filter, dry and heat treatment, the temperature rise rate is 100℃ / h, and the temperature is 280℃ for 0.5 hours. , And then continue to raise the temperature to 1150°C and keep it for 2 hours to obtain the high tetragonal phase zirconia powder of the present invention, the particle size is 100-200nm, the tetragonal phase zirconia content is about 75-80% of the total zirconia, containing 5.21 % Yttria has a zirconia content of 80% and an alumina content of 20%.

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Abstract

High density low viscosity pulp material and powder material with high content of tetragonal phase zirconium oxide are required by the invention. Surface of zirconium oxide is covered by a layer of aluminium oxide by heterogeneous precipitation, then they are processed by heating to make aluminium oxide solidifying at surface of zirconium oxide. The tetragonal phase content in zirconium oxide powder is increased to increase utilized ratio of zirconium oxide in ceramics prodn. Heating process is used to compose larger particle to reduce absorbing water quantity of the surface, thus to increase solid phase content of low viscosity pulp material. Growing of zirconium oxide in high temp. is restained by covering a layer of aluminium oxide, it is beneficial to generate fine-grained ceramics of zirconium oxide and aluminium.

Description

Technical field [0001] The invention relates to a zirconia-alumina composite powder for the preparation of ceramics and a preparation method thereof. Specifically, the invention relates to a zirconia with a high content of tetragonal phase of alumina coated for the preparation of high-strength and high-toughness ceramics -Alumina composite powder and its preparation method. Background technique [0002] High-performance zirconia must use high-quality powder and appropriate technology. At present, high-quality zirconia-based ceramic powder is prepared by the precipitation method of zirconium oxychloride (a water-soluble salt containing yttrium or cerium), and then heat-treated to prepare zirconia powder. The particle size of the powder prepared by this method is between 30-100 nanometers, and the content of tetragonal zirconia is about 50%. After granulation, it is suitable for dry molding. The strength of the pressureless sintered ceramic is 600-800MPa, and the fracture toughness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/64C04B35/48C04B35/482C04B35/488
Inventor 焦宝祥丘泰张其土冯春霞
Owner NANJING TECH UNIV
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