Preparation Of Fine Grained SiC At Reduced Temperature By Two-Step Sintering

Archives of Metallurgy and Materials

T.-J. Chung¹  B.-S. Kim²  K.-S. Oh³  H. Lee³  K.-W. Kim³ 

[1] D CENTER, WONIK QNC, GUMI, REPUBLIC OF KOREA;R&SCHOOL OF MATERIALS SCIENCE AND ENGINEERING, INDUSTRIAL TECHNOLOGY CENTER FOR ENVIRONMENT-FRIENDLY MATERIALS, ANDONG NATIONAL UNIVERSITY, ANDONG, REPUBLIC OF KOREA

关键词: Keywords: SiC;    Liquid phase;    Two-step sintering;    Coarsening;    Hardness;   

DOI  :  10.1515/amm-2015-0168

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Two-step sintering route was applied for the densification SiC by promoting the role of liquid phase. The specimen contained 8 vol% of liquid phase composed of Al2O3 and Y2O3. The heating schedule consisted with initial rapid heating to 2000°C and immediate quenching to 1700 or 1750°C. By heating at elevated temperature, even distribution of the liquid phase was intended. The heat treatment at reduced temperature was to suppress the evaporative loss of the liquid and to secure the time for densification. The two-step sintering effectively suppressed loss of mass and coarsening. The resultant SiC was thus dense and was composed of fine grains exhibiting hardness of 2321 kgf/mm2.

【 授权许可】

Unknown