Abstract

In this paper the manufacture of shrinkage-free in situ Mullite-ZrO$_2$ceramics through the addition of Al base metal powder to the mixture of ZrSiO$_4$and A1$_2$O$_3$was attempt. The ZrO$_2$-strengthened mullite ceramics was prepared after the following reaction form, 3(Al+Al$_2$O$_3$)+2ZrSiO$_4$longrightarrow3A1$_2$O$_3$.2SiO$_2$+2ZrO$_2$Al metal powder was added from none to 30 weight percent to the A1$_2$O$_3$. The powders were mechanically mixed, isostatically pressed and reaction sintered at 1450-1$600^{\circ}C$ for 3hours. The specimens were sintered with and without intrim soaking time for 5 hours at 125$0^{\circ}C$ for the oxidation of Al-powder The addition of aluminium accelerates the reaction and compensate the shrinkage during the sintering through an increase in volume of oxidized Al. Because coarse flake type Al metal powders were not effectively milled, oxidized Al resulted in the relative large pore in the specimen.

Keywords

File

Download PDF

References

1. Cearmic Transactions v.6 A review of powder preparation methods and densification procedures for fabricating high density mullite M.D. Sacks(et al.)
2. Br. Ceram. Trans. J. v.89 Preparation and properties of mullite grain T.J. Davies(et al.)
3. J. Am. Ceram. Soc. v.63 no.3-4 Mechanical properties of sintered, in situ-reacted mullite-zirconia composites N. Claussen;J.W. Jahn
4. Cearmic Transactions v.6 Mechanical properties and microstructures of mullite-zirconia composites A. Leriche
5. J. Am. Ceram. Soc. v.74 High temperature characterization of reaction-sintered mullite-zirconia composites P. Descamps(et al.)
6. Ceramic transactions v.6 Reaction-sintered mullite-zirconia and mullite-zirconia-SIC ceramics S. Moya
7. J. Mater.Sci. v.26 Effect of CeO₂on mullite-zirconia ceramics J.M. Wu;C.M. Lin
8. Keram. Z. v.43 Mullit-ZrO₂-Keramik mit zusatzen von Bentonit, Speckstein und MnO+TiO₂ I.S. Kim;H.W. Hennicke
9. J. Mater. Sci. v.14 Reaction hot-pressing of zircon-alumina mixtures E. Di Rupo(et al.)
10. Cearmic Transactions v.6 High-purity mullite ceramics by reaction sintering P. Boch(et al.)
11. J. Ceram. Soc. Jpn. v.98 Preparation of ZrSiO₄powder using sol-gel process(Part Ⅰ)-Influence of starting materials and seeding H. Kobayashi(et al.)
12. Abstracts of Annual Meeting of the Ceramic Society of Japan,Paper No.3H06 Mechanical properties of mullite-zirconia composites prepared by various methods T. Koyama(et al.)
13. Adv. Ceram. v.12 Microstructure and property development of in situ reacted mullite-ZrO₂composites J.S. Wallace(et al.)
14. 요업재료의 과학과 기술 v.9 no.6 용융산화법으로 제조한 세라믹기 복합재료 김일수
15. 요업학회지 v.20 no.1 첨가된 알루미늄의 산화가 알루미나의 소결에 미치는 영향 : Ⅰ. 공기중, 1350-1550℃에서 박정현;안주삼;김해두
16. J. Eur. Ceram. Soc. v.5 Low-shrinkage reaction-bonded alumina N. Claussen(et al.)
17. Ceram. Eng. Sci. Proc. v.11 no.7-8 Tailoring of reaction-bonded Al₂O₃(RBAO) ceramics N. Claussen(et al.)
18. J. Am. Ceram. Soc. v.76 Mechanisms and kinetics of reaction-bonded aluminium oxide ceramics S. Wu(et al.)
19. J. Mater Sci. v.20 Multicomponent toughened ceramic materials obtained by reaction sintering P. Pena(et al.)
20. J. Am. Ceram. Soc. v.74 Fabrication and properties of low-shrinkage reaction bonded mullite S. Wu;N. Claussen
21. Keram. z. v.45 Schwindungfreie Mullit-Keramik aus Kaolin und Al-pulver I.S. Kim
22. Ceram. Eng. Sci. Proc. v.11 no.7-8 Preparation and Characterization of reaction-bonded Al₂O₃(RBAO) matrix SiC particulate filler composites A.G. Gessing(et al.)
23. Structural Cearmics-Processing,Microstructures and Properties Processing of reaction-bonded Al₂O₃(RBAO) composites S. Wu(et al.);J.J. Bentzen(et al.)(ed.)
24. 요업학회지 v.31 no.3 산화물과 금속분말의 attrition miliing 및 반응소결 : Ⅰ. 분말의 특성에 따른 분쇄거동 황규홍;박정환;윤태경
25. 요업학회지 v.31 no.4 산화물과 금속분말의 attrition Milling 및 반응소결 : Ⅰ.분말의 분쇄특성에 따른 반응소결거동 황규?;김의훈