Abstract: Ceramic Matrix Composite (CMC), as one of the fiber reinforced composites, has been gradually applied in some power devices, such as the aero gas turbine engines and the rocket engines, due to its excellent heat-resistance and mechanical performance. The thermal properties of CMC have obvious anisotropy due to the internal structural and the difference between matrix and fibers. So the traditional thermal analysis method based on homogeneous metal materials for hot components may be not suitable for the CMC hot components. This paper firstly summarizes the prediction method of the CMC’s thermal conductivity for different internal structures, including the Unidirectional fiber reinforced composites (UFRC), the 2D/2.5D weave composites(TDWC) and the 3D braided composites(TDBC). Taken together, how to efficiently introduce micro-scale information of CMC in macro thermal analysis and establish a multi-scale thermal analysis method of CMC hot components with high accuracy and engineering application is a technical problem that needs to be broken through. For future engineering applications of CMC hot components, a thermal analysis model based on the reconstruction of three-dimensional microstructure characteristics is the key to establishing a high-precision thermal analysis method for CMC hot components. At the same time, thermal analysis needs to be further closely integrated with manufacturing processes and mechanical behavior analysis.

Key words: Ceramic matrix composite, thermal analysis method, anisotropic thermal conductivity, CMC hot component, cross-scale thermal analysis method