摘要
采用热压工艺制得致密的莫来石陶瓷和莫来石基陶瓷复合材料(ZTM、SiC晶须-莫来石、SiC晶须-ZTM)。通过引入SiC晶须或ZrO_2,使莫来石基陶瓷的力学性能有明显改善,SiC晶须和ZrO_2复合强韧则效果更为显著。组成为20vol.％SiC晶须-15vol.％ZrO_2-莫来石陶瓷材料,其室温及800℃的抗弯强度和断裂韧性分别为559MPa及425MPa,7.5MPa·m^(1/2)及7.4MPa·m^(1/2)。实验结果表明,莫来石基复合材料的相变增韧与晶须增韧机制的作用对韧性的贡献有良好的加和性。
Densed mullite ceramics and mullite-based composites (ZTM, SiC(w)-mullite, SIC(w)ZTM)were prepared by hot pressing technique. The mechanical properties of mullitebased ceramics are improved significantly by incorporating SiC whiskers or ZrO_2, and much more improved when incorporated with both SiC whiskers and ZrO_2. The flexural strength and fracture toughness of the mullite-based composites containing 20 vol.% SiC whiskers and 15 vol.% ZrO_2 are as follows: δ, (R. T.)=559MPa, δ, (800℃)=425MPa, K_(10)(R. T.)=7.5MPa·m^(1/2), K_(10)(800℃)=7.4MPa·m^(1/2). Experimental results indicate that phase transformation toughening and whisker reinforcing mechanisms for the mullitebased composites are substantially parallel.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1989年第5期467-471,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
