CaO-Al_2O_3-SiO_2系烧结微晶玻璃的结晶过程  

Crystallization of CaO Al_2O_3 SiO_2 sintered glass ceramics

作　　者：陈禾[1] 梁开明[1] 李力军[1] 段仁官[1] 左玉华 

机构地区：[1]清华大学材料科学与工程系,北京100084

出　　处：《清华大学学报（自然科学版）》1999年第10期15-17,共3页Journal of Tsinghua University(Science and Technology)

摘　　要：为控制微晶玻璃中晶体的数量、晶粒尺寸和形貌，采用Ｘ射线方法测定了ＣａＯ－Ａｌ２Ｏ３ －ＳｉＯ２ 系玻璃颗粒在烧结过程中的相对结晶率，并结合扫描电镜研究了不同温度区域内的结晶过程。实验结果表明，在低温（９００ ℃以下）烧结时，晶体沿原玻璃颗粒的界面生成，向玻璃颗粒内部生长，而在原玻璃颗粒的内部无析晶发生，此时的结晶率较低； 在中温区（９００～１ ０５０ ℃）烧结，晶体在玻璃颗粒界面和颗粒内部同时析出并长大，可获得较高的结晶率； 高温区（１ ０５０～１ １００ ℃）烧结时由于玻璃颗粒界面的快速粘合以及相变驱动力的减小，结晶率又趋于下降。To control the quatity, grain size and morphology of crystals in glass ceramics, relative crystallinity of CaO Al 2O 3 SiO 2 sintered glass ceramics was determined using XRD method. The crystallization at different temperature range was studied by SEM. The results indicate that sintering at low temperature (below 900℃), crystals originate at the interface of glass particles and grow toward the inside of particles. There was no crystallization taken place within particles and the crystallinity was relatively low. Higher crystallinity can be obtained at mid temperature range (900～1050℃) when crystallization takes place both at and within the interface of glass particles. The crystallinity tends to decrease at high temperature range (1050～1100℃) due to the rapid sintering and drop of driving force for phase transformation.

关 键 词：结晶率 微晶玻璃 烧结 钙硅氧化物 

分 类 号：TQ171.733[化学工程—玻璃工业]