摘要
降低红外辐射传热是解决纳米SiO2多孔绝热材料高温绝热性能差的关键。本文探讨了锆英石作为红外遮光剂对纳米SiO2多孔绝热材料绝热性能的影响。结果表明:微米级锆英石的引入,可大幅降低红外辐射传热,显著提高材料高温绝热性能,当掺加35%锆英石时,可将材料500℃时热导率从0.119W/(m·K)降低至0.053W/(m·K)。同时对锆英石的红外遮光机理进行了探讨和分析。
The reduction of radiation transfer is the key to improve thermal insulating properties of nano silica porous thermal insulating material at high temperatures. The effect of zircon on thermal insulating properties was investigated. The results show that the introduction of micro-zircon can greatly reduce IR radiation transfer and improve thermal insulating properties significantly at high temperatures. When zircon with mass ratio 35% is added,thermal conductivity can decrease from 0.119 W/（m·K） to 0.053 W/（m·K） at 500℃. In addition,the mechanism of IR opacification of zircon is also discussed and analyzed.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2010年第2期20-23,共4页
Aerospace Materials & Technology
基金
先进功能复合材料技术国防科技重点实验室基金资助(9140C56060C56)
