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中文核心期刊

热环境对超高温陶瓷材料抗热震性能的影响

Effects of thermal environments on the thermal shock resistance of ultra-high temperature ceramics

  • 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.

     

    Abstract: In the present study, the temperature-dependent thermal shock resistances ofUltra-High Temperature Ceramics (UHTCs) were measured based on the currentevaluation theories of thermal shock resistance parameters, since thematerial parameters of the UHTCs are very sensitive to the changes oftemperature. The influence of some important thermal environmentparameters,such as the surface heat transfer coefficient, heat transfercondition, thermal stress decay modulus and initial temperature of thethermal shock,on the thermal shock resistance parameters, criticaltemperature of rupture and critical temperature difference of rupture of theUHTCs were studied considering the effects of temperature on the physicaland mechanical properties of the UHTCs within the range of thermal shocktemperature. The results show that thermal shock behaviour of the UHTCs isstrongly affected by the thermal environments.

     

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