Sintering behavior and properties of SiC/Si_3N_4 composite

作     者：Yong Jiang Lan-Er Wu Wen-Zhou Sun 

作者机构：School of Materials Science and Engineering Beifang University of Nationalities 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2015年第34卷第2期

页      面：95-100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）] 080502[工学-材料学] 

基　　金：financially supported by the National Natural Science Foundation of China (No. 51362001) the Key Projects of Beifang University of Nationalities, China. (No. 2012XZK02) 

主　　题：SHS powder β-SIC SiC/Si_3N_4 composite Sintering behavior Properties 

摘      要：SiC/Si_3N_4 composite was pressureless sintered using self-propagating high-temperature combustion synthesis a-Si_3N_4 powder and appropriate amount of b-SiC powder. Both of the sintering additive systems were used,which were YAN（Y_2O_3–Al_2O_3–AlN） and YN（Y_2O_3–AlN）.The influences of b-SiC content on sintering behavior of SiC/Si_3N_4 composite were investigated. The results show that the density, shrinkage, bending strength, hardness, and fracture toughness of the samples with two sintering additive systems increase first with the increase of the contents of b-SiC and then decrease even when b-SiC contents continually increase. The tendency of weight loss of the samples is opposite. The b-SiC content of the samples with the best mechanical properties is different in two systems. For YAN system, the best mechanical properties of the samples are gained when b-SiC content reaches 10 %, while as for YN system it is 5 %. The properties of YN samples are superior to YAN samples. J phase（2Y_2O_3 ·Si_2N_2O） forms in YN system easily. A small amount of M phase（Y_2O_3·Si_3N_4） is observed in YAN system.