한국재료학회지 제32권 제5호 (p.258-263)

석탄재를 이용한 뮬라이트 휘스커 고다공성 세라믹 제작

Fabrication of High Porous Ceramic with Mullite Whisker from Fly Ash
키워드 :
fly ash,mullite whiskers,MoO3,porous ceramic.

목차

Abstract
1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
Acknowledgement
References

초록

Porous ceramics have the advantages of low density, low thermal conductivity, and excellent mechanical properties. Among porous ceramic manufacturing methods, the replica template method allows the easy manufacturing of porous filters with the highest porosity and pores of the desired size, but it also has the disadvantage that the resulting filters have low mechanical strength. To overcome this shortcoming, mullite (3Al2O3·2SiO2) whiskers, which have excellent thermal stability and high mechanical strength, were introduced in porous ceramic structure. The mullite whiskers were synthesized using a composition of Al2O3, flyash and MoO3. The morphologies and crystal structures of the mullite whiskers with MoO3 contents were investigated in detail. When the porous ceramic with mullite whiskers was fabricated using 20 wt% MoO3 catalyst the most uniform microstructure was obtained, and the mullite whiskers showed the highest aspect ratio of 47.03. The porosity and compressive strength of the fabricated porous ceramic were 82.12% and 0.83 MPa, respectively.