Abstract
Functionally Gradient Materials(FGMs) are expected to be applied, as advanced thermal barrier coating systems, to active cooling structures for air-frames and engines of hypersonic spaceplanes. In this paper, fabrication of (MoSi2-SiC)/TiA1 FGMs by the Gas-pressure Combustion Sintering is described and properties of the FGMs are discussed. Compositional distribution in the FGM was one of the most important determinants of residual thermal stress of an FGM, especially for radial stress on the MoSi2-SiC surface. Residual stress after fabrication was examined by thermal stress analysis, and experimental results were compared with analytical results. Static thermal stress in actual high-temperature environments was also examined analytically, and it was considered to be less critical than residual thermal stress after fabrication.
Published Version
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