电纺柔性SiO_(2)纳米纤维增强气相SiO_(2)隔热材料制备及性能  

Study on Preparation and Performance of Flexible Si0_(2) Fiber Reinforced Fumed Silica Insulation Material

作　　者：温佳杰 陈越军 崔燚 许凯政 李润康 于洋[2] 于云[2] 龙吉华 魏恒勇 卜景龙[1] WEN Jiajie;CHEN Yuejun;CUI Yi;XU Kaizheng;LI Runkang;YU Yang;YU Yun;LONG JiHua;WEI Hengyong;BU Jinglong(Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province,College of Materials Science and Engineering,North China University of Science and Technology,Tangshan 063210,China;Key Laboratory of Special Inorganic Coatings,Chinese Academy of Sciences,Shanghai 201899,China)

机构地区：[1]华北理工大学材料科学与工程学院,河北省无机非金属材料重点实验室,唐山063210 [2]中国科学院特种无机涂层重点实验室,上海201899

出　　处：《中国陶瓷》2021年第12期22-27,共6页China Ceramics

基　　金：国家自然科学基金(51302064,51472072);华北理工大学杰出青年基金(JQ201712);中国科学院特种无机涂层重点实验室开放课题(ICM-202006);国防科技重点实验室基金(61420050301)。

摘　　要：以静电纺丝法制备的SiO_(2)纳米纤维为增强体,以气相SiO_(2)纳米粉体为基体,采用B4C为焊点剂辅助热处理法制备了SiO_(2)纤维增强气相SiO_(2)复合隔热材料。通过X射线衍射、扫描电镜、抗折强度和导热系数等测试,研究了其物相组成、微观形貌、力学性能与隔热性能。结果表明:加入柔性SiO_(2)纳米纤维提供的空间网络骨架结构提高了复合材料机械强度,但不会显著降低其隔热性能。当SiO_(2)纤维质量分数为6%时,抗折强度为0.033 MPa,复合隔热材料在50℃时导热系数为0.0354 W/(m·K)。当SiO_(2)纤维质量分数为12%时,抗折强度为0.110 MPa,在50℃时的导热系数为0.0351 W/(m·K)。而未添加纤维样品的抗折强度仅为0.018 MPa,50℃时导热系数为0.0341W/(m·K)。In this paper,the flexible SiO_(2) nanofibers were firstly prepared by electrospinning,and then the flexible SiO_(2) fiber reinforced fumed silica composite insulation material was prepared by the B4C assisted heat treatment method.It was found that the addition of flexible SiO:nanofibers could improve the mechanical strength of the composites,and their thermal insulation performance was not reduced.When the SiO:fiber mass fraction is 6%,the flexural strength is 0.033 MPa,and the thermal conductivity of the composite heat insulation material is 0.0354 W/(m•K)at 50℃.When the mass fraction of SiO_(2) fiber is 12%,the flexural strength is 0.110MPa,and the thermal conductivity at 50℃ is 0.0351 W/(m•K).While the flexural strength of the sample without fiber is only 0.018 MPa,and the thermal conductivity at 50 DC is 0.0341 W/(m•K).

关 键 词：纤维增气相二氧化硅 碳化硼 导热系数 

分 类 号：TQ174.7548.1[化学工程—陶瓷工业]