Oxidation of (Cr,Ti)2AlC Compounds at 700-1000 ℃ for One Year in Air

Title
Oxidation of (Cr,Ti)2AlC Compounds at 700-1000 ℃ for One Year in Air
Authors
이재춘원성빈박상환이동복
Keywords
compounds; sintering; oxidation; scanning electron microscopy (SEM); alumina
Issue Date
2013-08
Publisher
대한금속 . 재료학회지; Korean journal of metals and materials
Citation
VOL 51, NO 8, 563-569
Abstract
(Cr,Ti)2AlC compounds were synthesized by hot pressing, and oxidized at 700, 850, and 1000℃ in air for up to one year. They consisted of Ti-incorporated Cr2AlC phase, Ti-rich phase, and Cr-rich phase. The formed scales divided into a uniform oxide layer and oxide nodules. The uniform oxide layer consisted primarily of a thin Al2O3 scale. The oxide nodules that originated from the Ti-rich phase consisted of TiO2, which grew by both the outward diffusion of Ti4+ ions and inward diffusion of O2- ions. Chromium did not appreciably enter the oxide scale. Instead, it existed in the Ti-incorporated Cr7C3 sublayer after oxidation. (Cr,Ti)2AlC compounds had good oxidation resistance, because of formation of the Al2O3 barrier layer. (Received January 10, 2013)
URI
http://pubs.kist.re.kr/handle/201004/46941
ISSN
17388228
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KIST Publication > Article
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