Thermodynamic analysis and preparation of β-SiC/ZrO_2 composites

作     者：Bei-yue Ma Jing-kun Yu Qiang Zhu Yong Sun 

作者机构：School of Materials and Metallurgy Northeastern University Shenyang 110004 China 

基　　金：supported by the National Natural Science Foundation of China (No.50274021)and Baoshan Iron and Steel Co. Ltd 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2009年第16卷第5期

页      码：581-585页

摘      要：A predominance area diagram for the Zr-Si-C-O system at 1773 K was plotted according to correlative thermodynamic data. β-SiC/ZrO2 composites were prepared based on the phase diagram by carbothermal reduction of zircon （ZrSiO4） in argon atmosphere. Zircon and carbon black were mixed according to the C/ZrSiO4 mass ratio of 0.2, and with 0, 1wt% and 2wt% extra addition of La2O3. Phase evolution of the mixture was investigated at 1723-1803 K by X-ray powder diffraction, and the microstructure of the product prepared at 1803 K for 4 h was examined by scanning electronic microscope. The results show that the decomposition of ZrSiO4 and the formation of β-SIC can be promoted by increasing the heating temperature and adding La2O3. The β-SiC/ZrO2 composites can be prepared at 1803 K for 4 h in a mixture of zircon, carbon black and La2O3, and the contents of β-SIC and m-ZrO2 in the product sample with 2wt% La2O3 reach the highest values of 10.8wt% and 89.2wt%, respectively. The crystal size of the products is about 200 nm.

主 题 词：composites silicon carbide zirconium dioxide carbothermal reduction thermodynamic analysis 

学科分类：080701[080701] 08[工学] 0807[工学-电子信息类] 0805[工学-能源动力学] 080502[080502] 

核心收录：

D　O　I：10.1016/S1674-4799(09)60100-X

馆 藏 号：203117800...