层状陶瓷材料热冲击破坏机理

abstract The thermal shock performance of porous ceramic were be studied by means of water cooling test and numerical analysis. The test results show that the imitational mode and propagations mode of thermal crack are real depend on the volume raction of porous in the materials, and critical temperature for the crack initiation in ceramic with lower volume fraction of the porus is higher than that in ceramic with higher volume fraction of the porous. A numerical model was established to simulate the test mentioned above. Additional, MgO/Al2O3 laminate ceramic were also be studied by test and numerical analysis, in particular, the influence of the roughness of interface between the layers and heated face on the thermal shock properties were studied detailed.

结合水冷却的热冲击实验和数值分析，研究具有微孔洞和微裂纹结构，以及由这些微结构单层所组成的层状结构陶瓷材料的热冲击性能。在认识材料的微结构对其在热冲击下的破坏起始模式和发展规律作用的基础上，提出抗热冲击陶瓷材料微结构的优化设计方案。此项研究不仅为新材料的研制提供理论基础，而且有助于在材料科学和固体力学的交叉领域中找到新的研究点。