|
Vol.51, No.8, 563 ~ 570, 2013
|
| Title |
| Oxidation of (Cr,Ti)2AlC Compounds at 700-1000℃ for One Year in Air |
| 이재춘 Jae Chun Lee , 원성빈 Sung Bin Won , 박상환 Sang Whan Park , 이동복 Dong Bok Lee |
|
|
|
| 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) |
|
|
| Key Words |
| compounds, sintering, oxidation, scanning electron microscopy, alumina |
|
|
 |
|
