Intermediate-temperature oxidation behavior of Ti2AlC in air

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	Intermediate-temperature oxidation behavior of Ti2AlC in air
	X. H. Wang; Y. C. Zhou
	2002
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	17 期号:11 页码:2974-2981
摘要	The isothermal oxidation behavior of Ti2AlC at intermediate temperatures of 500, 600, 700, 800, and 900 degreesC in flowing air was investigated by means of thermogravimetric analysis, x-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM)/energy dispersive spectroscopy. An anomalous oxidation with higher kinetics at lower temperatures of 500 and 600 degreesC was observed although Ti2AlC exhibited good oxidation resistance at higher temperatures. As revealed by SEM scale morphology observation, oxidation-induced cracks present at temperatures of 500 and 600 degreesC resulted in poor protectivity of scales and accounted for the anomalous oxidation. The weight gain data for the remaining temperatures were analyzed with an instantaneous parabolic rate constant method by assuming a parabolic rate law. The variations of instantaneous parabolic rate constant with time reflected the complexity of the oxidation behavior of Ti2AlC at intermediate temperatures. These variations were discussed from the viewpoint of phase transformation of oxidation products on the basis of XRD, Raman spectroscopy, and SEM scale morphology observation. As indicated by XRD and Raman spectra, the scale formed on Ti(2)AIC at higher temperature was stable alpha-Al2O3 and rutile TiO2, while transition aluminas of gamma-Al2O3, delta-Al2O3, theta-Al2O3, and TiO2 (anatase) were detected at lower temperatures. The whisker morphology of theta-Al2O3 at 800 degreesC and ridged morphology of alpha-Al2O3 at 800 and 900 degreesC were confirmed by SEM.
部门归属	chinese acad sci, inst met res, shenyang natl lab mat sci, high performance ceram div, shenyang 110016, peoples r china.;zhou, yc (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, high performance ceram div, 72 wenhua rd, shenyang 110016, peoples r china
关键词	Titanium Aluminides Raman-spectrum Ceramics Anatase Oxygen Alloys Tio2
URL	查看原文
WOS记录号	WOS:000179042900035
引用统计	被引频次：67[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36440
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. H. Wang,Y. C. Zhou. Intermediate-temperature oxidation behavior of Ti2AlC in air[J]. Journal of Materials Research,2002,17(11):2974-2981.
APA	X. H. Wang,&Y. C. Zhou.(2002).Intermediate-temperature oxidation behavior of Ti2AlC in air.Journal of Materials Research,17(11),2974-2981.
MLA	X. H. Wang,et al."Intermediate-temperature oxidation behavior of Ti2AlC in air".Journal of Materials Research 17.11(2002):2974-2981.