CAJ | 학술논문

采用溶胶一凝胶法制备了纤维增强SiO_2气凝胶隔热材料,对基体SiO_2气凝胶及复合材料进行不同温度的热处理.利用扫描电镜、比表面积和孔径测试仪和导热仪等手段对处理后材料的微观结构和常温隔热性能进行表征.结果表明:复合材料经低于700℃处理后,材料基体的微观结构略有变化,常温隔热性能基本保持不变;经1000℃处理的纳米结构发生了烧结、纳米孔含量减少,常温隔热性能显著降低.
채용용효일응효법제비료섬유증강SiO_2기응효격열재료,대기체SiO_2기응효급복합재료진행불동온도적열처리.이용소묘전경、비표면적화공경측시의화도열의등수단대처리후재료적미관결구화상온격열성능진행표정.결과표명:복합재료경저우700℃처리후,재료기체적미관결구략유변화,상온격열성능기본보지불변;경1000℃처리적납미결구발생료소결、납미공함량감소,상온격열성능현저강저.
SiO_2 aerogels reinforced by ceramic fibers were prepared by sol-gel method. Both the SiO_2 aerogels and the composite were treated under different temperatures. SEM, N_2 adsorption-desorption and thermal conductivity device were adopted to characterize the structure and thermal conductivity properties of the prepared materials. The resuits show that the microstmcture changes little after heating under 700℃ and the heat insulation properties maintains almost unchanged. However, after heat treatment at 1 000℃ ,the heat insulation properties decreased,nano-microstructures sintered and the amount of pores reduced.