摘要
通过SiC晶须对Y-TZP陶瓷材料的补强,发现:在SiC晶须分散均匀的情况下,尽管SiC晶须的体积含量高达30％,复合材料中单斜相氧化锆的含量并不高,氧化锆的应力诱导相变仍是复合材料的主要增韧机理,复合材料的力学性能并不随着SiC晶须含量的增加而降低。在复合材料中加入氧化铝后,发现少量的氧化铝加入有利于复合材料力学性能的提高。在氧化铝重量含量为6%,SiC晶须体积含量为20%时,复合材料的强度和断裂韧性分别为:1329±13MPa和14.8±0.7MPa·m^(1/2)。但是,过多的氧化铝加入又会使复合材料的力学性能出现下降趋势。SiC晶须加入后,复合材料的高温强度和抗热震性都有明显改善。
Effects of SiC whisker content on the mechanical properties of SiC whisker/Y-TZP compo-sites are studied. When SiC whiskers are distributed uniformly in Y-TZP matrix, there is a few amountof monoclinie zirconia in the composites. The transformation of zirconia from tetragonal to monoclinic is the main toughening mechanism. The mechanical properties of the composite are higher than that of the matrix. The composite containing 5％ weight alumina possesses excellent mechanical properties. The strength and fracture toughness of the composite containing 5％ weight alumina and 20％ volume SiC whisker are 1329±13 MPa and 14.8±0.7 MPa·m^(1/2) respectively. The composites show excellent high temperature strength and thermal shock resistence.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1992年第5期393-397,共5页
Journal of The Chinese Ceramic Society
关键词
碳化硅
晶须
氧化铝
复合材料
陶瓷
silicon carbide whisker
yttria-stabilized tetragonal zirconia polycrystals
alumina
composites
whisker reinforcement
