Effect of Pretreatment and Content of Glass Fiber on Properties of Silica Thermal Insulating Material

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.