| Title |
Oxidation of (Cr,Ti)2AlC Compounds at 700-1000℃ for One Year in Air |
| Authors |
이재춘(Jae Chun Lee); 원성빈(Sung Bin Won); 박상환(Sang Whan Park); 이동복(Dong Bok Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2013.51.8.563 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
compounds; sintering; oxidation; scanning electron microscopy; alumina |
| Abstract |
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) |