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以HfO2、Ta2O5粉体为原料,采用固相法合成Hf6Ta2O17材料。在空气气氛下1600℃常压烧结8h制备块体试样。用X射线衍射(XRD)仪检测合成粉体的相结构,通过场发射扫描电镜(SEM)观察试样的微观形貌,用热膨胀仪检测试样的热膨胀系数(TEC)。结果表明:固相法可以制备纯净单相的Hf6Ta2O17材料和比较致密的块体试样;Hf6Ta2O17材料在20~1400℃温度范围内没有相变,其高温相稳定性优于YSZ材料;Hf6Ta2O17在1200℃的热膨胀系数为9.59×10-6/℃,与YSZ材料的热膨胀系数接近,有望用于热障涂层。
HfO2, Ta2O5 powder as raw materials, the solid phase synthesis of Hf6Ta2O17 material. Atmospheric pressure sintering in air at 1600 ℃ 8h preparation of bulk samples. The phase structure of the synthesized powder was characterized by X-ray diffraction (XRD). The microstructure of the sample was observed by field emission scanning electron microscopy (SEM) and the thermal expansion coefficient (TEC) of the sample was measured by thermal dilatometer. The results show that the pure Hf6Ta2O17 material and the relatively dense block specimen can be prepared by solid state method. Hf6Ta2O17 material has no phase transition in the temperature range of 20-1400 ℃, and its phase stability at high temperature is better than that of YSZ material. ℃ coefficient of thermal expansion of 9.59 × 10-6 / ℃, with the thermal expansion coefficient of YSZ close to material, is expected to be used for thermal barrier coating.