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Phase transformation of alumina coating by plasma assisted tempering of aluminized P91 steels

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Title Phase transformation of alumina coating by plasma assisted tempering of aluminized P91 steels
 
Creator JAMNAPARA, NI
MUKHERJEE, S
KHANNA, AS
 
Subject OXIDATION MECHANISM
THIN-FILMS
AL-SI
PERMEATION
SCALES
ANTICORROSION
TEMPERATURE
ACTIVATION
HYDROXIDES
MORPHOLOGY
 
Description alpha-Al2O3 coating on aluminized surfaces are considered candidate coatings for blanket applications in fusion reactor. In order to generate alpha-Al2O3, aluminized P91 steel samples were subjected to normalizing and tempering treatments at 980 degrees C and 750 degrees C respectively. Oxygen plasma has been used during tempering treatment of aluminized P91 steel samples at 750 degrees C for 1 h. The resulting alumina coating on plasma tempered samples were compared with those of thermally tempered samples. The alumina films were characterized using XRD, XPS, and SEM-EDS techniques. Results indicate that the thermally tempered samples had theta-Al2O3 coating while the plasma tempered samples had alpha-Al2O3 coating after heat treatment. Such transformation of alumina phase was not visible without plasma. A hypothesis of theta to alpha-Al2O3 transformation in plasma is proposed. This paper emphasizes the role of plasma processing on generation of an improved insulation coating for TBM applications in fusion reactors. (C) 2015 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2016-01-14T14:34:21Z
2016-01-14T14:34:21Z
2015
 
Type Article
 
Identifier JOURNAL OF NUCLEAR MATERIALS, 464,73-79
0022-3115
1873-4820
http://dx.doi.org/10.1016/j.jnucmat.2015.04.019
http://dspace.library.iitb.ac.in/jspui/handle/100/17735
 
Language en