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Title: Characterization of VPS-W coating layers on molybdenum after heat exposure

Graphical abstract: - Highlights: • W powders were successfully coated on molybdenum using VPS coating technique. • W powders were completely changed into recrystallized grains after heat exposure. • VPS-W coating layer shows good adhesion to the Mo substrate after heat exposure due to the interdiffusion between W and Mo. • W-coated Mo material will extend the service life of hot-zone parts for high-temperature furnace applications. - Abstract: Tungsten (W) coating layers were successfully deposited using a vacuum plasma spraying (VPS) technique on a molybdenum (Mo) substrate. Tungsten powder with a median size of 10 μm was applied to prepare coatings via a plasma spray system. For the VPS process, argon and hydrogen were used as plasma-forming gases, and the coatings were deposited in 35 mbar vacuum pressure. A coating with a thickness of 300 μm was obtained, and some unmelted W powders were observed in the coating layer. This heat exposure experiment was performed in a sapphire crystal growing furnace at 2100 °C up to 110 h. After heat exposure, the VPS-W coating layers were soundly bonded with the Mo substrate due to the interdiffusion between W and Mo.
Authors:
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Publication Date:
OSTI Identifier:
22290357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 12; Conference: ISFM 2012: 5. international symposium on functional materials, Perth, WA (Australia), 17-20 Dec 2012; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AFTER-HEAT; ARGON; COATINGS; CRYSTALS; LAYERS; MICROSTRUCTURE; MOLYBDENUM; PLASMA; POWDERS; SAPPHIRE; SUBSTRATES; TUNGSTEN