Influence of moisture absorption on the synthesis and properties of Y₂O₃-MgO nanocomposites

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• 作者：Junxi Xie^a ; ^b ; Xiaojian Mao^a ; ^{xmao@siom.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaokai Li^a ; Benxue Jiang^a ; Long Zhang^a ; ^{lzhang@siom.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Y2O3&ndash ; MgO nanocomposites ; Nanopowders ; Moisture absorption ; Water resistance
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：40-44
• 全文大小：1148 K

文摘

Y₂O₃–MgO nanocomposites are appropriate materials for hypersonic infrared windows and domes because of their low emissivity and improved mechanical properties. In this study, the synthesized Y₂O₃–MgO nanopowders are investigated to evaluate the influence of moisture absorption on the manufacturing process and properties of the resulting nanocomposites. It is shown that MgO plays a more significant role than Y₂O₃ in the moisture absorption of the composite nanopowders, and the absorbed moisture leads to a lowering IR transmittance of the final Y₂O₃–MgO nanocomposites. A higher calcination temperature improves the resistance to moisture absorption of Y₂O₃–MgO nanopowders, which is beneficial for IR transmittance of the final nanocomposites. In addition, increasing the sintering temperature to 1100 °C during spark plasma sintering (SPS) minimizes the influence of absorbed moisture on the IR transmittance of the final nanocomposites. In the water resistance test, the Y₂O₃–MgO nanocomposites demonstrate severely eroded surfaces and degraded IR transmittance after water erosion, suggesting the requirement for necessary water-proof treatments on such materials in practical applications.