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ZrO2(Y2O3) powder and SiC nanopowder were prepared by carbothermal reduction of ZrSiO4. With the existence of additive Y2O3 and other impurities, ZrSiO4 was dissociated into ZrO2 and SiO2 in the condition of 1450—1550?℃. ZrO2(Y2O3)powder was thus obtained