1 National Engineering Research Center for Colloidal materials, Shandong University, Jinan 250100, China 2 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China 3 Institute of Aerospace Special Materials and Technology, Beijing 100074, China
Abstract: In the present work, alumina-based gel fibers were prepared through sol-gel method combined dry-spinning technology, which transformed to the continuous alumina ceramic fibers with the composition of 12.92wt% B2O3, 24.56wt% SiO2 and 62.50wt% Al2O3 after calcination. Thermogravimetric-differential scanning calorimeter(TG-DSC), scanning electron microscope(SEM), transmission electron microscope(TEM), X-ray diffraction(XRD) and mechanical property analytical techniques were applied to investigate the microstructure of the sol precursor, the phase composition of the fibers, as well as the surface and internal structure of the fibers. The results indicate that the sol precursor prepared through the sol-gel method has excellent and stable spinability, and the gel fibers with the length longer than 1 000 m can be obtained by dry-spinning. After calcination, B-containing continuous alumina ceramic fibers with the uniform diameter of 14—15 μm were formed. With the calcination temperature of 1 000 ℃, the main crystalline phase in the fibers is mullite, whose tensile strength can reach up to 1.35 GPa. The as-prepared continuous alumina ceramic fibers have excellent mechanical properties, which show great potential in the field of thermal protection.
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