Micro‐chemical investigation of thick W coating on AISI 420 martensitic steel

Abstract

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.

Effect of electric potentials on high‐temperature plasma nitriding of 2Cr13 stainless steel with active screen assisted

“…However, the relatively low chromium con-tent (~13 wt.%) in solutions containing chlorine results in lower corrosion resistance than other stainless steels [5]. Some surface modification methods to raise the corrosion resistance of 2Cr13 steels have been applied, including nitriding, nitrocarburizing, laser transformation hardening, plasma immersion ion implantation, physical vapor deposition, and the other processing technologies [6][7][8][9][10][11][12][13][14][15].…”