Preparation and Sintering of Zirconia-Toughnened Alumina Powder

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J. Korean Ceram. Soc. > Volume 29(3); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(3): 167.

지르코니아 인성강화 알루미나 분체의 제조 및 소결

이전, 최상욱, 한기성, 김승태

인하대학교 무기재료공학과

Preparation and Sintering of Zirconia-Toughnened Alumina Powder

ABSTRACT

Zirconia-toughnened alumina(ZTA) powders that were uniformly coated with zirconia and yttria on the surface of alumina particles were prepared in order to inhibit the grain growth of alumina. Alumina particles were ultrasonically dispersed in the ethanol solution of Zr-n-propoxide, and then the Zr-alkoxide was hydrolyzed. Hydrated zironia as thin film was stabilized to tetragonal crystalline form by doping yttria as a stabilizer. The prepared ZTA powders had the good sinterability even at the lower temperature. As a result, the sintered bodies showed the enhanced fracture toughness compared with pure alumina. The relative density and fracture toughness(KIC) of the ZTA bodies sintered at 1550$^{circ}C$ were 98% and 5 MPa$.$m1/2 respectively.