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采用固相法成功制备了纯度较高的各向异性负热膨胀材料Sc2W3O12。将ZrO2与Sc2W3O12按一定体积比混合,在1200℃烧结10h制备Sc2W3O12/ZrO2复合材料。通过XRD、SEM、EDS和热膨胀仪对合成样品的晶体结构、断面形貌和热膨胀性能进行表征。结果表明:样品组元为正交相Sc2W3O12和单斜相ZrO2;在30～600℃内,Sc2W3O12/ZrO2复合材料的热膨胀系数皆线性一致,并且通过改变Sc2W3O12的体积分数,其热膨胀系数可以控制为正、负或零,其中60%Sc2W3O12/ZrO2复合材料在30～600℃的平均热膨胀系数为0.026×10-6℃-1,近似为0。
The high purity anisotropic negative thermal expansion material Sc2W3O12 was successfully prepared by solid state reaction. The ZrO2 and Sc2W3O12 were mixed at a certain volume ratio and sintered at 1200 ℃ for 10h to prepare the Sc2W3O12 / ZrO2 composite. The crystal structure, cross-sectional morphology and thermal expansion of the synthesized samples were characterized by XRD, SEM, EDS and thermal dilatometer. The results show that the components of the sample are the quadrature phase Sc2W3O12 and the monoclinic phase ZrO2. The coefficients of thermal expansion of Sc2W3O12 / ZrO2 composites are linearly consistent at 30 ~ 600 ℃, and by changing the volume fraction of Sc2W3O12, the thermal expansion coefficient can be controlled as Positive, negative or zero. The average thermal expansion coefficient of 60% Sc2W3O12 / ZrO2 composite at 30-600 ℃ is 0.026 × 10-6 ℃ -1, which is approximately zero.