Improved yttrium partially stabilized zirconia production process

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...

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 room temperature is 330-350g / L, zirconium oxychloride is usually adjusted to 250g / L during production, and the formed precipitate is a hard block, which is not easy to be centrifuged and dehydrated. The particle size and fluidity of the wet-milled powder are not ideal; 3) The slurry after the co-precipitation reaction is washed with deionized water. The pH value of the deionized water is about 7, and the water consumption is large. The above water can completely precipitate, add deionized water directly, if the pH control of deionized water is slightly improper during the water production process, it will cause a small amount of yttrium to dissolve into the water and be lost, affecting product quality