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利用X射线衍射仪 (XRD)和扫描电子显微镜 (SEM ) ,对ZrOCl2 Al体系熔体反应生成的复合材料组织进行了分析 ,结果表明 :ZrOCl2 Al体系反应生成相为Al3 Zr和α Al2 O3 ,颗粒尺寸为 0 .2～ 5 μm ,形状以多面体为主 ;随反应起始温度升高 ,生成的颗粒体积分数增大 ,熔体温度也升高 ,但当熔体温度高于 12 0 0℃时 ,Al3 Zr出现聚集、长大。提出了ZrOCl2 Al体系的反应是气液反应和固液反应的复合过程 ,建立了ZrOCl2 /Al反应中的控制环节ZrO2 /Al反应的动力学模型及化学反应速率的关系式。
The microstructure of the composites formed by melt reaction of ZrOCl2 Al system was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the reaction phases of ZrOCl2 Al system are Al3Zr and αAl2O3, The size is 0.2-2 μm, and the shape is dominated by polyhedron. With the increase of initial reaction temperature, the volume fraction of particles increases and the melt temperature also increases. However, when the melt temperature is higher than 1200 ℃ , Al3Zr appears to aggregate and grow up. The reaction of ZrOCl2 Al system was proposed to be a complex process of gas-liquid reaction and solid-liquid reaction. The kinetic model of ZrO2 / Al reaction in ZrOCl2 / Al reaction and the relationship of chemical reaction rate were established.