Critical Biot's number for Determination of the Sensitivity of Spherical Ceramics to Thermal Shock
Critical Biot's number for Determination of the Sensitivity of Spherical Ceramics to Thermal Shock
复制标题
测定球形陶瓷热冲击敏感性的临界毕奥数
DOI：
10.1088/0256-307x/27/8/088104
复制
发表时间：
2010-08-01
影响因子：
3.5
通讯作者：
Song Fan
中科院分区：
文献类型：
--
作者：
Liu Qing-Nian;Meng Song-He;Song Fan
从理论上得到了一个临界毕奥数，它决定了球形陶瓷的淬火敏感性以及在热冲击作用下温度波传播和热应力的持续时间。结果表明，当陶瓷球的毕奥数大于临界数时，陶瓷球的热震失效是一个快速的过程，只发生在热传导的初始阶段，而陶瓷球的热震失效是不确定的。研究结果对热冲击热结构工程中陶瓷材料的选择具有指导意义。
A critical Biot number, which determines both the sensitivity of spherical ceramics to quenching and the durations of the temperature-wave propagation and the thermal stresses in the ceramics subjected to thermal shock, is theoretically obtained. The results prove that once the Biot number of a ceramic sphere is greater than the critical number, its thermal shock failure will be such a rapid process that the failure only occurs in the initial regime of heat conduction, whereas the thermal shock failure of the ceramic sphere is uncertain in the course of heat conduction. The presented results provide a guide to the selection of the ceramics applied in the thermostructural engineering with thermal shock.