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Micro‐chemical investigation of thick W coating on AISI 420 martensitic steel
Author(s) -
Balijepalli S. K.,
Kaciulis S.,
Lionetti S.,
Maddaluno G.,
Montanari R.
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5388
Subject(s) - materials science , auger electron spectroscopy , coating , tungsten , metallurgy , x ray photoelectron spectroscopy , thermal spraying , martensitic stainless steel , thermal expansion , plasma , martensite , divertor , composite material , tokamak , microstructure , chemical engineering , physics , quantum mechanics , nuclear physics , engineering
Tungsten is a favorable material for protecting mechanical components such as thermal shields and divertor parts from plasma damage in nuclear fusion reactors. A thick coating of W has been developed on AISI 420 martensitic stainless steel substrate by means of plasma spray technique. Plasma spraying has been used for its simplicity, the possibility to cover complex and extended surfaces and the relatively low cost. An appropriate interlayer has been optimized to increase the adhesion of W coating on the steel substrate and to provide a soft interface with intermediate thermal expansion coefficient for better thermo‐mechanical compatibility. The present work describes and discusses the results of micro‐chemical investigations on coating and interface by X‐ray photoelectron spectroscopy and Auger electron spectroscopy. Copyright © 2014 John Wiley & Sons, Ltd.