云母微晶玻璃的热压强化和韧化  

STRENGTHENING AND TOUGHENING OF MICA_CONTAINING GLASS-CERAMICS BY HOT_PRESSING TECHNIQUE

作　　者：程慷果[1] 万菊林[1] 粱开明 

机构地区：[1]清华大学材料科学与工程系

出　　处：《硅酸盐学报》1998年第3期403-406,共4页Journal of The Chinese Ceramic Society

摘　　要：用Ｘ射线衍射（ＸＲＤ）和扫描电镜（ＳＥＭ）对经过热压处理前后微晶玻璃进行了分析．结果发现，微晶玻璃中随机取向的云母晶体在热压过程中随着残余玻璃相的高温粘滞流动而发生定向排列．热压后定向排列的云母晶体对沿热压方向扩展的裂纹的偏转作用增强，使得热压方向上微晶玻璃的强度和断裂韧性增加．Mica_containing glass-ceramics before and after hot_pressing treatment were investigated by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). It is found that mica crystals randomly dispersed in the glass matrix before hot_pressing orientate preferentially after hot_pressing treatment,combining with the viscous flow of the residual glass phase. After hot_pressing treatment,both fracture toughness and bending strength constantly increase with the crystallization time and hot_pressing deformation. This is attributed to the variation of the microstructure, i.e., mica crystals preferentially oriente in the glass matrix,which effectively deflect the crack propagation along the direction of hot_pressing.

关 键 词：云母 微晶玻璃 热力 力学性能 玻璃 

分 类 号：TQ171.733[化学工程—玻璃工业]