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Porous γ-(Y1-xHox)2Si2O7 thermal insulator with excellent high-temperature strength retention and very low thermal conductivity
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2018-02-20 , DOI: 10.1016/j.jeurceramsoc.2018.02.027
Zhen Wu , Wanpeng Hu , Yixiu Luo , Luchao Sun , Jingyang Wang

High-temperature thermal insulation materials challenge extensive candidates with good mechanical, thermal and chemical reliability at high temperatures. Recently, porous γ-Y2Si2O7 was indicated a promising thermal insulator in harsh environment; however, its strength at 1300 °C reduced to 34% of that at room temperature. In this work, we significantly improved its high-temperature strength by doping Ho. Highly porous γ-(Y1-xHox)2Si2O7 solid solution was fabricated by in-situ foam-gelcasting method. Especially, porous γ-(Y2/3Ho1/3)2Si2O7 demonstrated the optimal high-temperature strength, for instance 65% retention at 1300 °C, as well as high compressive strength (13.9 MPa) and low thermal conductivity (0.186 W/(m K)) at room temperature, at the porosity of 79.3%. Interestingly, porous solid solution sample displayed obviously lower thermal conductivity than the two end pure-phase porous materials. Porous γ-(Y1-xHox)2Si2O7 solid solution is clearly highlighted as a promising high-temperature thermal insulator with outstanding high-temperature strength retention and optimal low thermal conductivity.



中文翻译:

具有优异的高温强度保持率和极低导热率的多孔γ-(Y 1-x Ho x2 Si 2 O 7绝热体

高温绝热材料以其在高温下良好的机械,热和化学可靠性挑战了广泛的候选材料。近来,多孔γ-Y 2的Si 2 ö 7是表示在恶劣的环境下有希望的热绝缘体; 但是,它在1300°C时的强度降至室温下的34%。在这项工作中,我们通过掺杂Ho显着提高了其高温强度。采用原位泡沫凝胶法制备了高孔隙率的γ-(Y 1-x Ho x2 Si 2 O 7固溶体。特别是多孔γ-(Y 2/3 Ho 1/32 Si 2O 7表现出最佳的高温强度,例如在1300°C下保持65%的孔隙率,以及在室温下的高孔隙率下的高抗压强度(13.9 MPa)和低热导率(0.186 W /(m K))。占79.3%。有趣的是,多孔固溶体样品的热导率明显低于两端的纯相多孔材料。γ-(Y 1-x Ho x2 Si 2 O 7多孔固溶体显然是一种有前途的高温绝热体,具有出色的高温强度保持性和最佳的低导热性。

更新日期:2018-02-20
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