Development of Thermal Shock Testing System for Functionally Graded Materials

研制了一套自动化、多功能的功能梯度材料热震性能测试系统。在新开发的系统中，可以通过用燃烧器火焰加热陶瓷表面和用气体或水流冷却底部表面（通常是金属）来系统地研究FGM试样的热机械性能。确定了燃烧器顶部和底部表面温度以及平均热流密度随燃烧器功率输出的变化关系。热冲击损伤监测声发射信号从损伤的启动和传播。通过逐步增加燃烧器的输出功率，反复进行加热和冷却循环，直到检测到大的损伤为止，对粉末冶金工艺制备的SiC-AlN/Mo、AlN/W、PSZ/不锈钢等功能梯度材料进行了燃烧器加热试验，研究了其热机械性能。它已被澄清，包括抗热震性和隔热性能，这是需要的功能梯度材料的设计，可以使用开发的系统来确定。

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.