Improved yttrium partially stabilized zirconia production process

A technology for stabilizing zirconia and production process, applied in the field of improved yttrium partially stabilized zirconia production process, can solve the problems of yttrium loss, gelation, large water consumption, etc., and achieves lower production cost, high sintering density and high strength Effect

Inactive Publication Date: 2005-11-23
宜兴新兴锆业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production process of yttrium-stabilized zirconia is to prepare the mixed water-soluble material of zirconium oxychloride and yttrium chloride with ammonia water for co-precipitation reaction, then wash with water, centrifugal dehydration, dry, and burn. The deficiencies in the process Yes: 1) ammonia water is passed into the mixed water-soluble material of zirconium oxychloride and yttrium chloride during production, gel phenomenon will be formed during the precipitation process, and the water consumption is large during the dechlorination and washing of the subsequent sequence, and the chlorine root cannot be cleaned; 2) Since the saturated solubility of zirconium oxychloride at ro

Method used

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Examples

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Effect test

Embodiment 1

[0009] Embodiment 1, a kind of improved production process of yttrium partially stabilized zirconia, prepare the mixed water-soluble material of zirconium oxychloride and yttrium chloride with deionized water, the concentration of zirconium oxychloride is 280g / L, zirconia: yttrium oxide It is 95.2:4.8. After the mixed aqueous solution is suction filtered to remove impurities, it is introduced into 4N ammonia solution for co-precipitation until the pH value of the solution reaches 10. The reaction is terminated. The precipitate is washed with deionized water and then dehydrated by centrifugation. The content of zirconia in the material reaches about 40%, and then it is calcined at 900°C for 2.5 hours, and finally it is coarsely ground by wet method and then crushed by air flow to obtain the finished product.

Embodiment 2

[0010] Example 2, referring to Example 1, the concentration of zirconium oxychloride in the mixed aqueous solution is 350g / L, zirconium oxide: yttrium oxide is 94: 6, and ammoniacal liquor concentration is 6N, coprecipitation reaction reaches when pH value reaches 9 and terminates, washing Use deionized water and ammonia water to adjust the pH value to 8, and when the zirconia content in the material reaches 50%, the drying is terminated, and the calcination is performed at 1100° C. for 1.5 hours.

Embodiment 3

[0011] Example 3, referring to Example 1, the concentration of zirconium oxychloride in the mixed aqueous solution is 300g / L, zirconium oxide: yttrium oxide is 95:5, and ammoniacal liquor concentration is 5N, coprecipitation reaction reaches 9.5 when termination, washing Use deionized water and ammonia water to adjust the pH value to 9, and when the zirconia content in the material reaches 45%, the drying is terminated, and the calcination is performed at 1000° C. for 2 hours.

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PUM

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Abstract

Disclosed is an improved yttrium partially stabilized zirconia production process which comprises subjecting the mixed water dissolved material of zirconium oxychloride and yttrium chloride for coprecipitation reaction with ammonia, i.e., letting the mixed water dissolved material of zirconium oxychloride and yttrium chloride into 4-6N of ammonia for coprecipitation, terminating the reaction when the pH of the solution reaches 9-10, the concentration of the zirconium oxychloride in the mixed water solution being 280-350g/L if converted to zirconium oxide, the ratio of zirconium oxide and yttrium oxide is 95.2-94 : 4.8-6, then washing the precipitate with deionized water, carrying out centrifugal dehydration, drying, firing and disintegrating to obtain the product.

Description

technical field [0001] The invention relates to the improvement of the production process of partially stabilized yttrium oxide zirconia. The produced yttrium partially stabilized zirconia can produce zirconia ceramics with higher sintered density and stronger strength. Background technique [0002] Yttrium partially stabilized zirconia In the process of making ceramics, the stabilizer yttrium oxide can prevent zirconia from cracking due to volume changes during crystal transformation, and make the sintering temperature of ceramics lower, only 1400 ° C, and the ceramics made The product is stronger. At present, the production process of yttrium-stabilized zirconia is to prepare the mixed water-soluble material of zirconium oxychloride and yttrium chloride with ammonia water for co-precipitation reaction, then wash with water, centrifugal dehydration, dry, and burn. The deficiencies in the process Yes: 1) ammonia water is passed into the mixed water-soluble material of zirco...

Claims

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Application Information

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IPC IPC(8): C04B35/48
Inventor 杨新民李福平宗俊峰
Owner 宜兴新兴锆业有限公司
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