Microstructure and Mechanical Properties of Infiltrated Zirconia-Mullite Composite

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J. Korean Ceram. Soc. > Volume 37(2); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(2): 174.

침투된 지르코니아-뮬라이트 복합체의 미세구조 및 기계적 성질

손영권, 이윤복¹, 김영우², 오기동¹, 박홍채¹

(주)삼손퍼라이트
¹부산대학교 재료공학부
²포항산업과학기술연구원

Microstructure and Mechanical Properties of Infiltrated Zirconia-Mullite Composite

ABSTRACT

Y-TZP/mullite composites were prepared by the infiltration of Y-TZP precursor into partially reaction-sintered mullite. The addition of Y-TZP(~7.2 wt%) increased the bend strength(207 MPa), fracture toughness(4.6MPa.m1/2) and Vickers microhardness(853kg/$textrm{mm}^2$) of the uninfiltrated mullite sintered at 162$0^{circ}C$ for 10h by more than 75, 70 and 105%, respectively. Residual alumina-rich glass was observed at a mullite/mullite junction, due to the mullitization reaction of silica melt with crystalline $alpha$-Al2O3 during a final sintering. Although ZrO2 inclusions improved the final sintered density of mullite they did not effectively prevent its grain growth.

Key words: Y-TZP/mullite composites, Infiltration, Y-TZP precursor, Partially reaction-sintered mullite