Oxidation behaviour of the 47Nb 16Si 25Ti 8Hf 2Al 2Cr alloy sheet and vibrational spectroscopy

被引：16

作者：

Lefez, B. ^{[1
]}

Jouen, S. ^{[1
]}

Hannoyer, B. ^{[1
]}

Bacos, M-P. ^{[2
]}

Beucher, E. ^{[3
]}

机构：

[1] Univ Rouen, Inst Mat Rouen, CNRS, GPM,UMR 6634, F-76801 St Etienne, France

[2] Off Natl Etud & Rech Aerosp, DMSM, MAT, F-92322 Chatillon, France

[3] CTR Anal & Surface, F-27100 Val De Reuil, France

来源：

MATERIALS AT HIGH TEMPERATURES | 2009年 / 26卷 / 01期

关键词：

FTIR; NbSi alloys; oxidation; high temperature; IN-SITU COMPOSITES; THIN-FILMS; TI; ABSORPTION; DEPOSITION; ADDITIONS; NIOBIUM; LAYERS; CR; AL;

D O I：

10.3184/096034009X435683

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the chemical analysis of 47Nb 16Si 25Ti 8Hf 2Al 2Cr alloy sheet exposed in static air at 1200 degrees C for 150, 300, 450, 600 and 900 seconds. This alloy exhibits linear oxidation kinetics. The dendritic phase M(5)Si(3) (with M = Hf and Ti) is observed to be not oxidised rapidly compared to the (Nb,Ti)(ss), due to low oxygen solubility. Distribution of elements in the cross section of the oxide scales was analysed by energy-dispersive X-ray spectrometry and mapping in a scanning electron microscope. TiNb(2)O(7) and W,05 have been detected by X-ray diffraction. In addition, Fourier-transform IR spectroscopy showed absorbance peaks which are a clear signature of the formation of Si-O-Si, Si-O-Ti, and Si-O-Hf bonding in the oxidation layer. This analysis suggests that the film contains also amorphous silicates, not detected with X-ray diffraction.

引用

页码：15 / 20

页数：6

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