Formation of composite powders and ceramics from β-SiC-Cr<SUP>2</SUP>O₃-C mixtures

作     者：Vlasova, MV Kakazey, NG Gonzales-Rodriguez, JG Mondragon, JJS Prilutskii, EV Tomila, TM Isaeva, LP Timofeeva, II Bukov, AI Gordienko, SP 

作者机构：UAEM Ctr Res Engn & Appl Sci Cuernavaca Morelos Mexico Natl Acad Sci Ukraine Inst Problems Mat Sci Kiev Ukraine 

出 版 物：《JOURNAL OF MATERIALS SYNTHESIS AND PROCESSING》 (材料合成与加工杂志)

年 卷 期：2001年第9卷第4期

页      面：187-197页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：beta-SiC Cr2O3 SiO2 C interaction silicide formation 

摘      要：The phase-formation process in the disperse beta-SiC + SiO2 + Cr2O3 + C system treated in vacuum at 1273, 1473, 1673, and 1873 K was studied by X-ray phase analysis, IR spectroscopy, EPR, and other methods. It was found that at treatment temperatures of 1273, 1473, and 1673 K, the major process is carbothermal reduction of Cr2O3 and SiO2 with the formation of chromium carbosilicide and chromium carbide (Cr3C2). At T = 1873 K, on the surface of the SiC particles, metastable chromium silicate forms on the base of SiO2 and Cr2O3. The reduction of Cr2SiO4 by silicon carbide is accompanied by the formation of CrSi2, Cr5Si3, and chromium carbosilicide. The phase composition of the products of interaction and their distribution over the volume of the composite powder and ceramic material are determined by the dispersion composition of the starting SiC powder and by the degree of development of reduction processes in local volumes of the disperse and compacted material.