单轴热压加载下云母微晶玻璃的晶体定向排列  

Orientational Arrangement of Crystal of Mica Glass-Ceramics in Uniaxial Hot-Pressing

作　　者：马新沛[1] 李光新[1] 沈莲[1] 金志浩[1] 

机构地区：[1]西安交通大学材料科学与工程学院,西安710049

出　　处：《西安交通大学学报》2003年第7期726-730,共5页Journal of Xi'an Jiaotong University

基　　金：西安交通大学 2 0 0 1年度自然科学基金资助项目 .

摘　　要：利用单轴热压变形物理模型进行实验模拟,对强化云母微晶玻璃的新途径———晶体定向排列进行了研究.结果表明:在单轴压缩变形方式下,云母微晶玻璃材料截面上的流变程度不均匀,导致晶体定向排列程度差异大.样品径向中心定向排列不明显,而靠近周边部位因玻璃相和云母晶体的强烈黏滞流变和转动,使云母晶体高度定向排列.云母晶体的定向排列可有效控制裂纹走向,显著提高其强度,也导致材料的各向异性.所采用的室温物理模型准确模拟了高温下云母玻璃陶瓷材料内部的应变特征和材料流动规律.A uniaxial hot-pressing test and a physical modeling simulation are performed to investigate the orientational alignment of crystals, and an attempt to strengthen mica glass-ceramics is made. The results show that the completion degree of orientational alignment in mica plates remarkably varies in different sites of the sample body, which is attributed to the uneven deformation under the uniaxial hot-pressing condition. The crystal alignment in the sample center is not obviously orientational, while the mica crystal in the peripheral area is highly directionally aligned owing to the intense viscous flow of glass phase and the rotation of the mica crystal. The directional alignment of crystal effectively controls the crack propagation paths, increases the strength and induces the anisotropy. The physical model exactly simulates the strain characteristic and flow regulation of the mica glass-ceramic during the uniaxial hot-pressing.

关 键 词：云母微晶玻璃 晶体定向排列 物理模拟 强化 

分 类 号：TQ171[化学工程—玻璃工业]