期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.05.068
关键词
Mechanical characterization; Ceramics; Glass; Crystallization; Lithium disilicate; Residual stresses
类别
资金
- National Natural Science Foundation of China (NSFC) [81371176, 51171137]
Crystal size of lithium disilicate (LD) phase in a LD glass-ceramic was changed by thermally controlled crystallization of a precursory LD glass at different temperatures. Effects of the crystal size on the mechanical properties of the glass-ceramic were investigated. It was found that the flexural strength presented a hump-like variation trend with increasing the crystal size, the hardness monotonously decreased at the same time. It was further confirmed that micro residual compressive stresses existed inside the LD crystals due to the thermal expansion mismatch between the glass matrix and the crystalline phase. The levels of the residual stresses increased with increasing the crystal size. The crystal size performed dual effects on the flexural strength of the glass-ceramic: an interlocking effect caused by larger-sized LD crystals and a micro residual stress effect related to the balancing tensile stresses in the glass matrix. Higher residual tensile stresses in the glass matrix induced by larger-sized LD crystals would counteract the interlocking effect of the crystals, causing the strength degradation. The hardness of the glass-ceramic was mainly controlled by the micro residual stress effect. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据