以纳米SiO2粉末为主要原料,添加红外遮光剂和无碱超细玻璃纤维,采用干压法成型成功制备了密度小、导热系数低的SiO2纳米多孔绝热材料。为改善高温条件下的绝热性能,重点研究了红外遮光剂的选取及其影响。结果表明:以SiC作为红外遮光剂的SiO2纳米多孔绝热材料可有效降低高温下的红外热辐射。 Using nano-SiO2 powder as the main raw material, adding infrared sunscreen agent and alkali-free superfine glass fiber, and adopting the dry pressing method to successfully prepare SiO2 nano porous thermal insulation material with small density and low thermal conductivity. In order to improve the adiabatic performance under high temperature conditions, the selection of infrared sunscreen agent and its influence are studied emphatically. The results show that SiO 2 nanoporous thermal insulation materials with SiC as the infrared opacifier can effectively reduce the infrared thermal radiation under high temperature.