以高纯铝屑和氯氧化锆为主要原料 ,用化学共沉淀—凝胶工艺分别制备出平均粒径约10nm的纯ZrO2 、Al2 O3 50ZrO2 、Al2 O3 2 0ZrO2 三种纳米超微粉 ,其中ZrO2 基本以t相结构存在。在不同温度煅烧后 ,纯ZrO2 粉粒迅速长大而转变为单斜相 ,Al2 O3 ZrO2 复合粉粒长大困难 ,并使ZrO2 仍主要以四方相存在 ,Al2 O3以非晶态存在。表明ZrO2 纳米粉粒以四方相在室温下稳定存在的原因是尺寸效应造成的。 The pure ZrO2, Al2 O3 50ZrO2 and Al2 O3 2 0ZrO2 nano-powders with the average particle size of about 10 nm were prepared by chemical coprecipitation-gel process with high-purity aluminum flakes and zirconyl chloride as the main raw materials. The basic ZrO2 In t-phase structure exists. After calcined at different temperatures, the pure ZrO2 powder grows rapidly and turns into a monoclinic phase. The Al2 O3 ZrO2 composite powder grows difficultly, and ZrO2 still exists mainly in the tetragonal phase, while Al2 O3 exists in the amorphous state. The results show that the reason that ZrO2 nano-particles are stable in tetragonal phase at room temperature is due to size effect.