The Fabrication and Characteristics of Porous Alumina Ceramics by Pressureless Powder Packing Forming Method : I . Alumina

,; ,; ,; ,; ,; ,; ,; ,; ,; ,

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

Journal of the Korean Ceramic Society 1999;36(6): 662.

무가압분말충전성형법에 의한 다공성 세라믹스의 제조 및 특성 : I. 알루미나

박정현, 황명익, 김동희, 최환욱, 김용남

연세대학교 세라믹공학과

The Fabrication and Characteristics of Porous Alumina Ceramics by Pressureless Powder Packing Forming Method : I . Alumina

ABSTRACT

Porous alumina was fabricated from pressureless powder packing forming method using powders granulated by spray drying. It was investigated the pore size distribution of fabricated porous alumina. The results of microstructural observation showed that intraganular pore size and intragranular pore size. At 1700$^{circ}C$ there were no intragranular pores but it showed homogeneous distribution of intergranular pore size. The bending strength and shrinkage increased as porosity decreased. In case 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 alumina ceramics, Pressureless powder packing forming method, Spray dried powder