摘要
以玻璃纤维、气相法白炭黑、TiO_2及结合剂为原料,采用干法成型工艺制备了玻璃纤维增强硅质隔热复合材料,系统研究了玻璃纤维预处理技术及其含量对材料导热性能及力学性能的影响,并且观察了其微观形貌。结果表明,纤维表面预处理可有效提高其在基体中的分散性,改善其与基体的界面粘结性;纤维最佳含量为20%;在200℃、500℃和900℃时其热导率分别仅为0.029W/(m·K)、0.033 W/(m·K)和0.043W/(m·K),耐压强度为1.38MPa;与未添加纤维的硅质隔热材料相比,热导率降低21%～28%,耐压强度提高了116%。
Glass fiber reinforced silica thermal insulation composites were prepared by the dry preparation techniques. The effect of dispersion and different content of glass fiber on thermal conductivity and mechanical property of silica thermal insulation materials were studied, and its microstructure was observed. The results show that glass fiber surface pretreatment can improve the dispersion of glass fiber in matrix and interfacial adhesivity, and the optimal content is 20%, the thermal conductivities at 200℃, 500℃, 900℃are about 0. 029W/（m · K）, 0. 033W/（m · K）, 0. 043W/（m · K） respectively, the compressive strength is 1.38MPa. Compared with silica material,the thermal conductivity is reduced approximately 21%-28 and compressive strength is improved about 116 %. Besides, the brittleness of the silica is improved.
基金
教育部新世纪优秀人才支持计划项目(NCET-10-0137)
湖北自然科学基金(2008CDB269)
关键词
玻璃纤维
隔热材料
性能
glass fiber, thermal insulation materials, properties
