Thermal stability and oxidation resistance of polycrystalline Ba8Al16Si30-based clathrates
Thermal stability and oxidation resistance of polycrystalline Ba8Al16Si30-based clathrates
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Ba8Al16Si30 基多晶包合物的热稳定性和抗氧化性
DOI：
10.1002/pssa.201300145
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Hiroaki Anno and Ritsuko Shirataki
中科院分区：
文献类型：
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作者：
Yoji Mine;Kaoru Koga;Kazuki Takashima;Zenji Horita;Hiroaki Anno and Ritsuko Shirataki
采用电弧熔炼和放电等离子烧结相结合的方法制备了多晶Ba 8Al 16 Si 30基包合物样品（标称成分Ba 8Al 15 Si 31）。在空气中在873 K下进行热处理0-480 h，以检查热稳定性和抗氧化性，这在材料在高温下使用时具有实际重要性。在300-1473 K空气中的热重分析（TG）和差热分析（DTA）表明，Ba_8Al_（15）Si_（31）块体在低于1073 K的空气中具有较好的热稳定性。根据X射线衍射测量、扫描电子显微镜、能量色散X射线光谱和X射线光电子能谱，推断通过热处理在表面上形成厚度约为0.6 μm的薄氧化物（可能是铝酸钡）层。通过在空气中热处理480 h，发现电导率的降低相对较低（小于15%）。
Polycrystalline Ba8Al16Si30‐based clathrate samples (nominal composition Ba8Al15Si31) were prepared by combining arc melting and spark plasma sintering methods. Heat treatments were conducted at 873 K for 0–480 h in air to examine the thermal stability and the oxidation resistance, which are of practical importance when the material is used at elevated temperatures. Thermogravimetry (TG) and differential thermal analysis (DTA) in the range 300–1473 K in air indicated that Ba8Al15Si31bulk form possessed relatively good thermal stability in air below approximately 1073 K. From X‐ray diffraction measurements, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and X‐ray photoelectron spectroscopy, it was inferred that thin oxide (probably barium aluminates) layer with the thickness of approximately 0.6 µm was formed on the surface by the heat treatment. The decrease in the electrical conductivity was found to be relatively low (less than 15%) by the heat treatment for 480 h in air.