Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10629211 | Journal of the European Ceramic Society | 2016 | 8 Pages |
Abstract
The critical Al content required to form protective Al2O3 scale on Ti3AlC2 at 1100 °C in air has been investigated by using a scale removal cyclic oxidation method. During the first five cycles, Al2O3 scale forms predominantly, and Ti3AlC2 keeps a similar low mass-gain rate. With increasing the cycle number, the Al content in Ti3AlC2 decreases. During the sixth cycle, the breakaway oxidation happens, and non-protective multilayer oxide forms. It is determined that the critical value of Al/Ti mole ratio is in the range of (0.970-0.977)/3 for the selective oxidation of Ti3AlC2, the corresponding atomic percent of Al is in the range of 16.25-16.34 at.%. Meanwhile, a part of Ti3AlC2 substrate decomposes to TiCx because of de-intercalation of enough Al from Ti3AlC2 during the sixth cyclic oxidation.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xichao Li, Yuhai Qian, Lili Zheng, Jingjun Xu, Meishuan Li,