Chang-An Wang¹; ¹Tsinghua University

With the development of aerospace industry, higher requirements, e.g. lightweight, high temperature resistance, high strength and low thermal conductivity, have been put forward for heat insulation materials for high temperature parts. The properties of porous ceramics depend on the characteristics of the composition and structure including porosity, pore configuration, pore size and distribution. In this presentation, some progress on porous ceramics for heat-insulation in my group will be reported. Some novel processing techniques, including modified gelcasting, freeze-casting, fiber reinforcing, aerogel impregnation, hollow-grained processing and so on, have been developed to design and control the specific porous structure, therefore, some specific properties including ultra-high porosity, ultra-lightweight, high strength, and low thermal conductivity have be achieved for some potential heat-insulation applications. The matching relationship between strength and thermal conductivity will also be discussed.