Diffusion of Cr, Fe, and Ti ions from Ni-base alloy Inconel-718 into a transition alumina coating
- 作者：M. Dressler ; martin.dressler@bam.de ; M. Nofz ; I. Dö ; rfel ; R. Saliwan-Neumann
- 关键词：Diffusion ; UV&ndash ; vis spectroscopy ; Transmission electron microscopy ; Alumina coatings ; Sol&ndash ; gel deposition
- 刊名：Thin Solid Films
- 出版年：2012
- 期刊代码：78_00406090
- 类别：ph
- 出版时间：30 April, 2012
- 卷：520
- 期：13
- 页码：4344-4349
- 文件大小：1312 K
摘要
Heat treating metals at high temperatures trigger diffusion processes which may lead to the formation of oxide layers. In this work the diffusion of Cr, Fe and Ti into an alumina coating applied to Inconel-718 is being investigated. Mass gain measurements, UV-vis spectroscopy and transmission electron microscopy were applied in order to study the evolution of the diffusion process. It was found that mainly Cr as well as minor amounts of Fe and Ti are being incorporated into the alumina coating upon prolonged heat treatment at 700 掳C. It could be shown that alumina coatings being void of Cr have the same oxidation related mass gain as uncoated samples. However, incorporation of Cr into the alumina coating decreased their mass gain below that of uncoated substrates forming a Cr oxide scale only.