摘要
用碳化硅颗粒 SiC(p)、Y-TZP 作为补强剂,单一强化增韧莫来石陶瓷,其复合材料的力学性能获得一定程度的改善。在此基础上用 SiC(p)和 Y-TZP 共同强化增韧莫来石陶瓷,制备的 SiC(p)/Y-TZP/莫来石(M)复合材料室温强度达500MPa,韧性达6.1MPa·m^(1/2),室温至1000℃范围内,强度随温度升高下降很小。同时材料的抗热震性能得到显著改善。用 SEM 和 TEM 分析材料断口等显微结构,确定 SiC(p)/M复合材料中裂纹偏转和分支对强化增韧起主要作用;Y-TZP/M 复合材料中微裂纹增韧起重要作用。
Mullite matrix composites reinforced by SiC particles,Y-TZP,and both respec-tively were fabricated by hot pressing.The mechanical properties of these composi-tes were investigated.The flexural strength and fracture toughness as well as ther-mal shock resistance of SiC(p)/Y-TZP/M composites were significantly improved,compared with that of SiC(p)/M or Y-TZP/M.This SiC(p)/Y-TZP/M compositegave the strength 500 MPa and fracture toughness 6.1 MPa.m^(1/2),and the strengthwas almost constant from room temperature to 1000℃.The observations of micro-structures by SEM and TEM revealed that the reinforcing mechanisms for SiC(p)/M composites were mainly crack deflection and crack branching by SiC particles,and for Y-TZP/M composites microcrack toughening was important.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第4期340-345,共6页
Journal of Inorganic Materials
关键词
莫来石
陶瓷
复合材料
碳化硅
增韧
Mullite
SiC particle
Y-TZP
Strengthening and toughening
Composite
