摘要
基于超高温陶瓷材料相关材料参数对温度的敏感性,以现有的抗热震断裂评价理论为基础,通过考虑温度对超高温陶瓷材料物理性能的影响,探讨了热震温度范围内热应力衰减系数、表面热传递系数、热冲击初始环境温度等热环境参数对抗热冲击阻力参数、断裂临界温差和断裂临界温度的影响.
In the present study, the temperature-dependent thermal shock resistances of Ultra-High Temperature Ceramics （UHTCs） are examined based on the current evaluation theories of thermal shock resistance parameters, since the material parameters of the UHTCs are very sensitive to the changes of temperature. The influence of some important thermal environment parameters , such as the surface heat transfer coefficient, heat transfer condition, thermal stress decay modulus and initial temperature of the thermal shock , on the thermal shock resistance parameters, critical temperature of rupture and critical temperature difference of rupture of the UHTCs are studied considering the effects of temperature on the physical and mechanical properties of the UHTCs within the range of thermal shock temperature. The results show that thermal shock behaviour of the UHTCs is strongly affected by the thermal environment.
出处
《力学学报》
EI
CSCD
北大核心
2008年第1期40-45,共6页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金资助项目(90505015).~~
关键词
超高温陶瓷
抗热冲击阻力参数
表面传热系数
衰减系数
临界温差
ultra-high temperature ceramics, thermal shock resistance parameter, surface heat transfer coefficient, decay modulus, critical temperature difference
