中文摘要：

在复合引入不同比例Al粉、Si粉（Al粉、Si粉的组合分别为2％（w）Al＋3％（w）Si，3％（w）Al＋2％（w）Si，4％（w）Al＋1％（w）Si）的Al2O3-ZrO2-C材料中进一步外加质量分数分别为0、1％、2％的SiO2微粉，经配料、混练、成型、烘干后，在埋炭（煤焦炭）气氛中分别于800、1000、1200、1300和1400℃保温3h煅烧，然后对烧后试样进行三点弯曲试验，并测定烧后试样的平均孔径，分析烧后试样的显微结构。结果表明：1）对于含不同比例Al粉和Si粉的Al2O3-ZrO2-C材料，SiO2微粉的引入使其经1200oC或更高温度煅烧后的抗折强度、弹性模量和韧性提高，平均孔径减小；2）显微结构分析发现，含有SiO2微粉的试样中，A1N和（或）SiC晶须发育良好并且分布均匀，孔径细小，从而优化了材料力学性能。

英文摘要：

Varied additions （0,1% ,and 2%） of microsilica powder were added in Al2O3-ZrO2-C refractory materials with different additions of metal AI and Si composite powders （2%Al ＋3%Si,3%Al ＋2%Si,4%Al ＋ 1%Si）. Specimens preparation strictly followed batching, mixing, pressing, curing, and firing in coke bed at 800,1000,1 200, 1 300 and 1 400℃ for 3 h, respectively. The three-point bending strength tests of fired specimens were carried out. Also the microstructure and pore size distribution of specimens were observed and analyzed. The results show that： （1）the introduction of microsilica can increase MOR,elastic modules,and toughness of the specimens fired at 1200 ℃ or higher temperatures, and decrease average pore size; （2） mechanical properties of the specimens with microsilica can be improved remarkably,which is attribu- ted to well-developed and evenly-distributed AIN and/or SiC whiskers with smaller average pore size in microstructure.