The Fabrication and Characteristics of Porous Ceramics by Pressureless Powder Packing Forming Method ; II, Mullite & Cordierite

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J. Korean Ceram. Soc. > Volume 36(6); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(6): 671.

무가압분말 충전성형법에 의한 다공성 세라믹스의 제조 및 특성 : II. 뮬라이트 & 코디어라이트

박정현, 황명익, 김동희, 최환욱¹, 김용남

연세대학교 세라믹공학과
¹연세대학교 세라믹공학

The Fabrication and Characteristics of Porous Ceramics by Pressureless Powder Packing Forming Method ; II, Mullite & Cordierite

ABSTRACT

Porous ceramics were fabricated from pressureless powder packing forming method using mullite and cordierite powders granulate by spray drying. The bending strength and shrinkage of porous ceramics were increased and their porosity were decreased with increasing temperature. It showed homogeneous distribution of 2$mutextrm{m}$ intergranular pores of mullite at 1400$^{circ}C$, 2.5$mutextrm{m}$ intergranular pores of cordierite at 1300$^{circ}C$ respedtively. Above that temperature intragranular particles were sintered and sintering by intergranular necking was extremely proceeded. In the test of thermal shock resistance sudden decrease of bending strength to $Delta$T was not shown because intergranular large pore prevented sudden crack propagation.

Key words: Porous ceramics, Pressureless powder packing forming method, Spray dried powder, cordierite, Mullite