ZrO_2/ZrW_2O_8复合材料的制备及其热膨胀性能

Preparation of ZrO_2/ZrW_2O_8 Composites and Study of Its Thermal Expansion

以分析纯ZrO2、WO3为原料,采用固相法快速烧结合成ZrW2O8,然后将其与ZrO2在高温下复合制备可控热膨胀ZrO2/ZrW2O8复合材料。通过XRD、拉曼光谱和热膨胀仪等分析手段对产物结构进行表征。研究结果表明,ZrO2和ZrW2O8质量比分别为3∶1、2∶1、1.5∶1、1∶1时,复合材料的热膨胀系数为1.20×10-6 K-1、0.32×10-6 K-1、-0.78×10-6 K-1和-1.19×10-6 K-1。通过改变ZrW2O8的体积分数,ZrO2/ZrW2O8复合材料的热膨胀系数可以控制为负、正或零。当ZrW2O8的体积分数为37%时,复合材料的热膨胀系数接近零。

ZrW2O8 is rapidly sintered from pure ZrO2 and WO3 in solid-state reaction, and then synthesized with ZrO2 under high temperature to prepare the controllable thermal expansion composite ZrO2 /ZrW2O8. X-ray diffraction, Raman spectroscopic and Dilatometer analyses are employed to determine the structure characterization. Results show that when the mass ratios of ZrO2 to ZrW2O8 are3 ： 1, 2 ： 1, 1.5 ： 1 and 1 ： 1, the CTEs of the composite are 1.20×10^-6 K^-1,0.32×10^-6 K^-1, -0.78 ×10^-6 K^-1 and -1.19 ×10^-6 K^-1.With changing the volume fraction of ZrW2O8, the CTEs of the composite can be made negative, positive or zero. The composite has a near zero thermal expansion when the volume fraction of ZrW2O8 is 37%.