加张烧结下连续氧化铝纤维的组织结构演变规律

doi:10.19976/j.cnki.43-1448/TF.2022038

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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.

Key words： alumina fiber tensile sintering thermal decomposition phase transformation relative density strength

Received: 31 March 2022 Published: 15 November 2022

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	PENG Shaoheng
	YAO Shuwei
	WANG Juan
	LIU Wensheng
	MA Yunzhu

Cite this article:

PENG Shaoheng,YAO Shuwei,WANG Juan, et al. Microstructure evolution of continuous alumina fiber under tensile sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 542-549.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022038 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I5/542

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