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Improving the Cyclic‐Oxidation Resistance of Ti 3 AlC 2 at 550°C and 650°C by Preoxidation at 1100°C
Author(s) -
Qian Xukun,
He Xiaodong,
Li Yibin,
Sun Yue,
Zhu Chuncheng
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02476.x
Subject(s) - materials science , amorphous solid , cyclic stress , diffraction , thermal oxidation , chemical engineering , composite material , crystallography , chemistry , engineering , physics , layer (electronics) , optics
Preoxidation of Ti 3 AlC 2 at 1100°C for 2 h was conducted to improve its cyclic‐oxidation resistance at the testing temperature of 550°C and 650°C in air. The cyclic oxidation of the preoxidized Ti 3 AlC 2 was found to follow a parabolic rate law rather than the linear oxidation rate for that without preoxidation. Through the X‐ray diffraction and SEM analysis, the remarkable improvement of the cyclic‐oxidation resistance of preoxidation Ti 3 AlC 2 is suggested due to the existence of protective α‐Al 2 O 3 layers formed during the preoxidation treatment, which inhibits the formation of amorphous Al 2 O 3 , which can result in larger thermal stress and stress‐induced microcracks.