SiC作为纳米SiO2多孔绝热材料红外遮光剂的试验研究

Nano Silica Porous Thermal Insulating Material With SiC as Infrared Opacifier

中高温环境下纳米SiO2多孔绝热材料对红外热辐射近于透明,而导致其绝热性能变差。针对这一问题,将SiC微粉作为红外遮光剂引入绝热材料中,测定了不同粒度和掺加量试样的有效消光系数。结果发现,在波长为2.5～7.0μm红外辐射波段,SiC微粉的引入能使材料有效消光系数大幅提高。无遮光剂试样的有效消光系数为1.9～12.6m2/kg,而加入质量分数25%中位粒径3.029μm的SiC微粉(SiC03)后,试样有效消光系数达到52.7～58.8m2/kg。背温试验结果证明了纳米SiO2多孔绝热材料中引入SiC后,其隔热性能得到明显改善。

SiC as an infrared opacifier was compounded with nano silica porous thermal insulating material which bad thermal insulating properties at mid - high temperature for too high IR transimittance. Effrctive specific extinction of samples was measured with different mass ratio and particle size. The result showed the introduction of SiC could greatly improve effective specific extinction in the wavelength from 2.5 to 7 μm. The values of sample with no opacifier were from 1.9 to 12.6 m^2/kg. However, when SiC3 with mass ratio 25% was doped, they increased from 52. 7 to 58.8 m^2/kg. Moreover, that is also verified by temperature measurement.