Thermal characteristic evaluation of functionally graded composites for PSZ/metal

The functionally graded material (FGM) is the new concept for a heat resist ing material. FGM consists of ceramics on one side and metal on the other. A composition and microstructure of an intermediate layer change continuous ly from ceramics to metal at the micron level. This study is carried out to analyze the thermal shock characteristics of functionally graded PSZ/metal composites. Heat-resistant property was evaluated by gas burner heating te st using C2H2/O-2 combustion flame. The ceramic surface was heated with bur ner flame and the bottom surface cooled with water flow.. Also, the composi tion profile and the thickness of the graded layer were varied to study the thermomechanical response. Furthermore, this study carried out the thermal stress analysis to investigate the thermal characteristics by the finite e lement method. Acoustic emission(AE) monitoring was performed to detect the microfracture process in a thermal shock test.