Synthesis of Mullite-Zirconia Composites from Kaolin by Gel Coating

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J. Korean Ceram. Soc. > Volume 37(5); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(5): 497.

Gel Coating법에 의한 Kaolin으로부터 Mullite-Zirconia 복합체의 합성

김세훈, 김인섭¹, 이병하

명지대학교 공과대학 무기재료공학과
¹요업기술원

Synthesis of Mullite-Zirconia Composites from Kaolin by Gel Coating

ABSTRACT

In this study, mullite-zirconia comosite was fabricated by adding ZrOCl2.8H2O using of boehmite gel coating to Hadong kaolin (pink A grade) in order to enhance strength of the mullite specimens. The influence of ZrOCl2.8H2O content and fireing temperature on the crystall phase, microstructure, bulk density, strength of the specimens was investigated. Mullite-zirconia composite was produced in the process of coating zirconia to mullite powder synthesized thereafter and mixing simultaneously of starting materials with boehmite-zirconia gel. Maximum strength with in this study was 251 sintered at 1$600^{circ}C$ for 2h. Bulk density and strength of the composite with zirconia coated mullite was higher than simultaneous on mixture of starting materials.

Key words: Kaolin, Gel coating, Mullite-Zirconia composite, ${ZrOCl_2}