摘要
研究了CaO对我国DK型烧结高铝矾土材料抗蠕变性能的影响.结果表明,在中低温度下,随CaO加入量的增多,材料的抗蠕变能力下降,但超过组成转折点(Ⅰ等矾土6%CaOⅡ等10%CaO)后,抗蠕变能力有所改善;但高温(1300℃)时抗蠕变能力随CaO加入一直下降.认为初期蠕变减速指数m可作为初步抗蠕变能力的判据;抗蠕变能力与组成和结构密切相关.
The effect of CaO addition on the creep resistance of sintered Chinese bauxites was studied. The rusults show that the creep resistance deceases with CaO addition for hoth grade I and I bauxites. But after the turning point carresponding to 6% and 10% CaO addition for grade I and I bauxites respectively, the property is improved slightly. The property shows singular drop at 1300℃ with CaO addition. It is concluded that the decceleration exponent m at the transient stage of creep might be served as an indicator of long term creep resistance;that the creap resistance is closely related with CaO addition and microstructure;and that the main mechanisms dominating creep under lower temperature are grain boundary sliding and diffusion, but at high temperature e. g. 1300℃ viscous flow predominates.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
1994年第2期25-30,共6页
Bulletin of the Chinese Ceramic Society
