High temperature oxidation behavior of nanostructured Ni-Al coatings on superalloy

被引：37

作者：

Rahman, Atikur ^{[1
]}

Jayaganthan, R. ^{[1
]}

Prakash, Satya ^{[1
]}

Chawla, Vipin ^{[1
,2
,3
]}

Chandra, Ramesh ^{[2
,3
]}

机构：

[1] Indian Inst Technol, Dept Met & Mat Engn, Roorkee 247667, Uttar Pradesh, India

[2] Indian Inst Technol, Inst Instrumentat Ctr, Roorkee 247667, Uttar Pradesh, India

[3] Indian Inst Technol, Ctr Nanotechnol, Roorkee 247667, Uttar Pradesh, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 472卷 / 1-2期

关键词：

Thin films; Scanning electron microscopy; High temperature alloys; MECHANICAL-PROPERTIES; MICROSTRUCTURE; RESISTANCE;

D O I：

10.1016/j.jallcom.2008.04.091

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The high temperature oxidation behavior of magnetron sputtered Ni-Al coatings on the superalloy substrate has been studied in the present work. The microstructural and morphological features of Ni-Al coatings were characterized by FE-SEM, AFM and XRD. Thermo gravimetric technique was used to investigate the oxidation behavior of the coatings. in air at 900 degrees C. The growth kinetics of oxide layers was predicted from the weight changes of the coating samples measured during oxidation. It was found that the corrosion rate of nanostructured Ni-Al coated superalloy was lower than that of the uncoated superalloy due to the formation of continuous, dense, adherent and protective oxide scale over the surface of the coatings. The morphological features and phases of the corroded coatings were used to elucidate the mechanism of high temperature oxidation. A continuous thin layer of protective oxide films such as NiO and Al2O3 has formed over the Ni-Al coatings exposed to air at high temperature, 900 degrees C. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：478 / 483

页数：6

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