降低红外辐射传热是解决纳米SiO_2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SiO_2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0.119 W/(m·K)降低至0.053 W/(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.
参考文献
| [1] | 封金鹏,陈德平,杨淑勤,倪文,胡子君.SiC作为纳米SiO2多孔绝热材料红外遮光剂的试验研究[J].宇航材料工艺,2009(01):38-40,48. |
| [2] | 高香珍 .纳米SiO_2绝热材料性能研究[D].北京:北京科技大学,2009. |
| [3] | Kuhn J;Gleissner T;Arduini-Schuster M C et al.Integration of mineral powders into SiO_2 aerogels[J].Journal of Non-Crystalline Solids,1995,186:291-295. |
| [4] | Makio Naito;Akira Kondo;Toyokazu Yokoyama .Applications of comminution techniques for the surface modification of powder materials[J].ISIJ International,1993,33(09):915-924. |
| [5] | Abe, HY;Abe, I;Sato, K;Naito, M .Dry powder processing of fibrous fumed silica compacts for thermal insulation[J].Journal of the American Ceramic Society,2005(5):1359-1361. |
| [6] | Holman J P.Heat transfer[M].北京:机械工业出版社,2008:5-13. |
| [7] | 杨淑勤 .红外遮光剂在绝热材料中的应用及其作用机理[D].北京科技大学,2008. |
| [8] | Spinnler M;Winter E R F;Viskanta R et al.Theoretical studies of high-temperature muhilayer thermal insulations using radiation scaling[J].Journal of Quantitative Spectroscopy and Radiative Transfer,2004,84:477-491. |
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