Research Of Heat-insulating Ceramic Fibers Derived From The Animal Fibers(Silk)Template

The subject used animal fibers (silk) as the biological template, preparing to maintain animal fiber structure of ZrO2and Al2O3ceramic fibers by the structure of genetic and chemical composition variation means. Silk fibers were first immersed into a zirconium nitrate and aluminum chloride solution, then drying at room temperature, finally sintered in air at high temperatures to produce two oxide ceramic fibers.This paper discussed the effect of the experiment conditions (concentration of impregnation solution, dipping time and sintering temperature) on the ceramic fibers morphology, and given the optimal experimental conditions. The thermal conductivities at100℃,500℃and1000℃were detected by the steady-state plate diathermometer. The results showed that the thermal conductivities of the biomorphic ceramic fibers lowed than that of traditional ceramic fibers, exhibited a good thermal insulation permanent. The preparation of ceramic fiber sintering process were studied by using DSC-TG test analysis, it can be known that the fabrication process of these biomorphic fibers can be separated into two steps; one is the formation of biomorphic ceramic fibers, and the other is the removal their silk templates. The prepared products were also analyzed by using SEM, EDS, FTIR and other means of testing. This paper from the microscopic structure, specific surface area, pore size distribution and residual discussed the reason of biomorphic ceramic fibers have excellent insulation properties.The theories of biological template and biomorphic mineralization were introduced in preparation of heat-insulating materials in this paper. The products retained the natural structure of the bio-templates with high fidelity. This fabrication method provides a new idea to obtain efficient heat-insulating materials, broadening the research scope of morph-genetic materials.