本文研究了非均相沉淀法制备Al2O3－ZrO2（3Y）－SiC复合粉体的工艺过程，认为粉体的理烧温度是至关重要的，热压烧结得到了致密的Al2O3－ZrO2（3Y）－SiC纳米复合材料，ZrO2的加入对烧结温度的影响不大．通过TEM观察，SiC颗粒均匀分散于材料中，大的ZrO2颗粒位于Al2O3晶粒间，小的圆形ZrO2颗粒位于Al2O3晶粒内，一部分Al2O3晶粒呈非等轴状．80Wt％Al2O3－15wt％ZrO2－5Wt％SiC纳米复合材料的抗弯强度可达555MPa，韧性为3.8MPa．m1／2.
The Al2O3-ZrO2(3Y)-SiC composite powders were made by the heterogeneous precipitation method. For getting dense sintered body, the selection of the calcining temperatures was important. The addition of ZrO2 did not
change the hot-pressing sinter temperatures, and the dense bodies could be got at 1700℃. Nano SiC particles were uniformly located in Al2O3
grains because of the transformation of Al2O3 from γ phase to α phase. Larger ZrO2 particles were located among Al2O3
grains, and little spherical ZrO2 particles were located in Al2O3 grains. Some Al2O3 grains were no-equiaxed. The strength of Al2O3-SiC
nanocomposites was 555MPa, toughness was 3.8 MPa·m1/2.
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