Abstract: The chromium oxide sintering process is applied to produce the SiC-mullite-zirconia multiphase material featuring excellent performance，with nano-η-Al 2O3 powder taken as the aluminum source and micro-silica as the silicon source to synthesize the associative phase of mullite. With the experiment，the authors probe into the influence of firing temperature exerted on the physical property，phase composition and micro-structure of a multiphase material， and conduct comprehensive thermal analysis of the raw materials. The results show that the SiO2 generated by SiC oxidation is highly active so that it starts to react with the η-Al2O3 in the transient phase under 996.5 ℃，forming solid mullite；the samples boast the best overall performance under 1 600 ℃，with their bulk density reaching 2.82 g/cm3 ，apparent porosity 3.2%, flexural strength 143.2 MPa at room temperature, while oxidation mass gain 0.65% only；the calcined ZrO2 losses its stability，transforms from c-ZrO2 to m-ZrO2，and evenly distributed in the samples；the mullite crystallizes well and bonds tightly with SiC. Key words：Nano-η-Al 2O3；Chromium oxi

Key words: Nano-η-Al 2O3, Chromium oxide sintering, Mullite, Multiphase material, Physical properties