Abstract：Continuous alumina fibers were prepared using sol-gel dry spinning-high temperature sintering method. During the pre-sintering and high-temperature sintering of the precursor fibers, the self-designed tensioning sintering device was used to apply axial tension to the fibers. The effects of tension on the thermal decomposition, phase transformation, structural evolution and properties of alumina fibers during the sintering process were investigated by characterizing the morphology, composition and structure of alumina fibers and comparing with the fibers sintered freely (without tension).The results show that the application of tension during sintering can significantly increase the straightness of pre-sintered and sintered fibers, and promote the decomposition and removal of residues in precursor fibers. Tensile sintering can inhibit the axial shrinkage of fibers, increase the radial shrinkage, and promote the transformation of γ-Al2O3 to α-Al2O3. Tensile sintering can also improve the grain morphology and pore distribution of fibers, promote grain growth and shrinkage, and removal of intergranular pores, and promote the densification of fibers. Compared with free sintering, the application of 0.9 MPa axial tension during sintering increases the average tensile strength of alumina fibers sintered at 1500 ℃ for 3 min by 231%, from 0.35 GPa to 1.16 GPa.
彭劭恒, 姚树伟, 王娟, 刘文胜, 马运柱. 加张烧结下连续氧化铝纤维的组织结构演变规律[J]. 粉末冶金材料科学与工程, 2022, 27(5): 542-549.
PENG Shaoheng, YAO Shuwei, WANG Juan, LIU Wensheng, MA Yunzhu. Microstructure evolution of continuous alumina fiber under tensile sintering. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 542-549.
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2022, Vol. 27 
