共沉淀法制备 (Sm1-xGdx)2Zr2O7 陶瓷材料的热物理性能
首发时间:2020-12-22
摘要:为了提高高温燃气轮机的热效率,研究除氧化钇稳定的氧化锆外的新型热障涂层用(Sm1-xGdx)2Zr2O7稀土锆酸盐材料具有重要的科学意义和应用价值。采用共沉淀法制备了(Sm1-xGdx)2Zr2O7,通过X射线衍射和激光闪光扩散率测量,研究了(Sm1-xGdx)2Zr2O7 (0≤X≤1.0)从室温到1400℃的结构演变和热物理性质。纯Gd2Zr2O7陶瓷表现出有缺陷的萤石型结构,而(Sm1-xGdx)2Zr2O7 (0.1≤X≤1.0)陶瓷具有烧绿石型结构。在500 K~1500 K的区间内(Sm1-xGdx)2Zr2O7陶瓷的热导率为0.4~1 W/(moK)。
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Preparation steps of (Sm1-xGdx)2Zr2O7 ceramic materials prepared by hydrothermal method
Abstract:To improve the thermal efficiency of high-temperature gas turbine, research on preparing rare-earth zirconate materials in addition to YSZ using in novel thermal barrier coatings has not only important scientific significance but also applications. The structural evolution and thermophysical properties of (Sm1-xGdx)2Zr2O7 (0≤X≤1.0) from 500K to 1500K were studied by X-ray diffraction and laser flash diffuser measurements. Pure Gd2Zr2O7 ceramics exhibit a defective fluorite structure, whereas (Sm1-xGdx)2Zr2O7 (0.1≤X≤1.0) ceramics have a calcined turquoise structure. The thermal conductivity of (Sm1-xGdx)2Zr2O7 ceramics ranges from 0.4 to 1 W/(moK).
Keywords: Coprecipitation method Rare earth zirconate Thermal barrier coating
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共沉淀法制备 (Sm1-xGdx)2Zr2O7 陶瓷材料的热物理性能
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