摘要
系统地研究了不同添加剂（如Ａｌ２Ｏ３，ＡｌＮ和Ｂ４Ｃ等）在热等静压（ＨＩＰ）烧结条件下对ＳｉＣ陶瓷之致密机理、显微结构以及力学性能的影响。结果表明：在ＨＩＰ烧结过程中，Ａｌ２Ｏ３可以与ＳｉＣ颗粒表面的ＳｉＯ２生成低共熔的铝硅酸盐玻璃相，并有效地促进ＳｉＣ陶瓷的致密化。当添加３％（以质量计）Ａｌ２Ｏ３时，采用ＨＩＰ烧结工艺，在１８５０℃温度和２００ＭＰａ压力下烧结１ｈ，就可获得相对密度和抗弯强度分别高达９７．３％和５８２ＭＰａ的ＳｉＣ陶瓷。
The influences of different additives such as Al 2O 3,AlN and B 4C on densification,microstructure and properties of hot isostatically pressed SiC ceramics were investigated.Al 2O 3 is confirmed to be an effective additive for hot isostatic pressing of SiC due to the formation of an eutectic alumino silicate glassy phase between SiO 2 and Al 2O 3.A commercial submicron αSiC powder with the addition of 3%(in mass)Al 2O 3 is densified to obtain a relative density of 97 3% and a flexural strength of 582MPa by glass encapsulated hot isostatic pressing under 200MPa in Ar at 1850℃ for 1h.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1997年第4期395-400,共6页
Journal of The Chinese Ceramic Society
关键词
碳化硅陶瓷
热等静压
烧结
压制成型
silicon carbide,ceramics,hot isostatic pressing,sintering
