High-temperature oxidation behavior of un-dense Ti3AlC2 material at 1000 °C in air

被引:21
作者
Ai, Taotao [1 ]
机构
[1] Shaanxi Univ Technol, Sch Mat Sci & Engn, Hanzhong 723003, Peoples R China
关键词
Hot pressing; Ti3AlC2; Oxidation behavior; High-temperature; SPACE-CHARGE SEGREGATION; TITANIUM-DIOXIDE; GRAIN-BOUNDARIES; TI3SIC2; AL;
D O I
10.1016/j.ceramint.2011.10.091
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Un-dense Ti3AlC2 material containing 3 wt% TiC was prepared by hot-pressing process using elemental powders of 2TiC/Ti/Al. Its oxidation behavior at 1000 degrees C in static air was investigated. SEM analysis indicates that the as fabricated sample is un-dense and the Ti3AlC2 grains with plate-like shape exhibit two types of fracture surfaces of layered and flat features. The oxidation behavior of the product exposed at 1000 degrees C for 30 h obeys a near-cubic law. The scale consists of rutile TiO2 and alpha-Al2O3 phases, and presents three layers, including an outer un-dense TiO2 layer adhering to a little Al2O3, a thick intermediate TiO2 + Al2O3 mixed layer and a thin inner Al2O3 layer with some pores. The thickness of the oxide layer was higher than 300 mu m. In addition, the deleterious effects of TiC and innate-pores on the oxidation resistance of the product were also investigated. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:2537 / 2541
页数:5
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