中文摘要：

以Al2O3和WO3为原料，采用固相反应法制备了负热膨胀性能的Al2（WO4）3粉体。用X射线粉末衍射和扫描电镜分别对粉体进行物相、晶体结构分析和形貌观察；通过热重-差热分析了粉体的热性能；采用热膨胀仪测定了热膨胀系数。结果表明：产物为高纯度正交晶系结构的Al2（WO4）3，形状规则，大小均匀，平均尺寸为0．6μm×0．4μm。从室温到熔点范围内，Al2（WO4）3粉体无相变，不发生分解，30～900℃的平均热膨胀系数为-1．56×10^-6K^-1。

英文摘要：

Negative thermal expansion material Al2 （WO4）3 powders were prepared by solid state reaction using aluminum oxide and tungsten trioxide as raw materials. The phase, crystal structure and morphology of the powders were characterized by powder X-ray diffraction（XRD）and scanning electron microscopy（SEM）respectively. The thermodynamic property of the powders was characterized by thermo gravimetric and differential thermal analysis（TG-DTA）. The thermal expansion coefficients of Al2 （WO4）3 powders were measured by thermal dilatometer. The results show that the sample is Al2 （WO4）3 with high purity and orthorhombic structure. The particles have regular morphology and the size distribution is homogeneous, which is 0. 6 μm× 0. 4μm averagely. The powders have no phase transition and decomposition in the temperature range from room-temperature to the melting point. The average thermal expansion coefficient of the powders is - 1.56 μ 10^-6 K^-1 in the temperature range of 30-900 ℃.