Development of Thermal Shock Testing System for Functionally Graded Materials

研制了一种自动与多功能相结合的功能梯度材料热冲击性能评价燃烧器加热测试系统。在新开发的系统中，通过用燃烧器火焰加热陶瓷表面，并用气体或水流冷却底表面（通常是金属），可以系统地研究FGM样品的热力学性能。确定了顶底表面温度和平均热流密度随燃烧器功率输出的函数关系。利用损伤产生和传播过程中释放的声发射信号对热冲击损伤进行监测。通过逐步增加燃烧器的输出功率，加热和冷却的循环被重复，直到发现一个大的损坏。通过燃烧器加热试验，对SiC-A1N/Mo、A1N/W、PSZ/不锈钢等粉末冶金工艺制备的功能梯度材料（fgm）的热力学性能进行了评价。研究表明，利用所开发的系统可以确定FGM材料设计所需的性能，包括抗热震性和隔热性。

A burner heating test system for evaluating thermal shock behavior of Functionally Graded Materials (FGM) has been developed, which has well-combined automatic and multi-functions. Thermomechanical properties of a FGM specimen can be systematically investigated by heating the ceramic surface with burner flame and coolong the bottom surface (usually metals) with gas or water flow in the newly developed system. The top and bottom surface temperatures and the average heat flux were determined as a function of the power output of burner. Thermal shock damage was monitored with acoustic emission signals liberated from damage initiation and propagation. By increasing the output power of burner stepwisely, a cycle of heating and cooling was repeated until a large damage was detected.The burner heating tests have been carried out for evaluating the thermomechanical performance of Functionally Graded Materials (FGMs) fabricated by powder metallurgical process, such as in the SiC-A1N/Mo, A1N/W,PSZ/Stainless steel systems. It has been clarified that the properties including thermal shock resistance and thermal insulation, which is needed for the design of the FGM materials, can be determined using the developed system.