摘要
以α-SiC和BaAl2Si2O8(BAS)为原料,采用热压烧结工艺制备了SiC基复合材料.研究了添加剂对液相烧结SiC基复合材料的致密化、显微组织、抗弯强度及断裂行为的影响.测试结果表明,添加剂BAS有效促进了SiC基复合材料的致密化.40wt%BAS/SiC复合材料的抗弯强度和断裂韧性分别高达454MPa和5.1MPa.m1/2.复合材料的主要增韧机制为SiC晶粒的拔出、裂纹偏转和裂纹桥连.
Silicon carbide （SiC） composites were prepared by hot - press sintering from α- SiC starting powders with BaAl2Si2O8 （BAS）. The effects of additives on densification, microstructure, flexural strength and fracture behavior of the liquid phase sintered （LPS） SiC composites were investigated. The results show that the additives BAS effectively promotes the densification of SiC composites. The flexural strength and fracture toughness of the SiC composites can reach a maximum value of 454 MPa and 5.1 MPa · m1/2, respectively, for 40wt% BAS/SiC composites. SiC grain pullout, crack deflection and crack bridging were main toughening mechanisms for the sintered composites.
出处
《通化师范学院学报》
2012年第12期14-16,共3页
Journal of Tonghua Normal University
关键词
SIC
BAS
液相烧结
力学性能
Silicon carbide （SiC）
BaA12Si/Os （BAS）
liquid phase sintered （LPS）
mechanical property
