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采用前驱体分解法制备了高纯ZrWMoO8粉体。为获得ZrWMoO8/Cu复合材料,首先将ZrWMoO8与Cu按1:1的比例进行研磨获得混合粉,采用化学镀的方法获得ZrWMoO8与Cu比例为1:1的包覆粉,然后压片并在氩气气氛保护下于500℃烧结3 h获得复合材料。详细研究了复合材料的热膨胀性能并且发现包覆粉更适合制备ZrWMoO8/Cu复合材料。结果表明:烧结后,混粉制备的复合材料中部分ZrWMoO8发生了分解并且与Cu发生了反应,而以包覆粉制备的ZrWMoO8/Cu复合材料未检测出ZrWMoO8的分解产物。包覆粉制备的复合材料在25~250℃显示的热膨胀系数为3.3774×10-6℃-1,其相对密度达到90.6%。
High purity ZrWMoO8 powder was prepared by precursor decomposition method. In order to obtain ZrWMoO8 / Cu composites, firstly, ZrWMoO8 and Cu are ground in a ratio of 1: 1 to obtain a mixed powder. Electroless plating is used to obtain a coated powder with a ratio of ZrWMoO8 to Cu of 1: 1, Gas atmosphere at 500 ℃ for 3 h to obtain a composite material. The thermal expansion properties of the composites were studied in detail and the coated powders were found to be more suitable for the preparation of ZrWMoO8 / Cu composites. The results show that some ZrWMoO8 in the composites are decomposed and reacted with Cu after sintering. However, the ZrWMoO8 / Cu composites prepared by coating do not detect the decomposition products of ZrWMoO8. The composite material prepared by coating powder shows a thermal expansion coefficient of 3.3774 × 10-6 ℃ -1 at 25 ~ 250 ℃ and a relative density of 90.6%.