Tungsten Coating on Low Activation Vanadium Alloy by Plasma Spray Process

Tungsten (W) coating on fusion candidate V-4Cr-4Ti (NIFS-HEAT-2) substrate was demonstrated with plasma spray process for the purpose of applying to protection of the plasma facing surface of a fusion blanket. Increase in plasma input power and temperature of the substrate was effective to reduce po...

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Bibliographic Details
Published in:Fusion science and technology 2005-05, Vol.47 (4), p.876-880
Main Authors: Nagasaka, Takuya, Muroga, Takeo, Noda, Nobuaki, Kawamura, Masashi, Ise, Hideo, Kurishita, Hiroaki
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BENDING
DESIGN
DUCTILITY
FIRST WALL
FRACTURES
HARDENING
PLASMA
SUBSTRATES
SURFACE COATING
THERMAL STRESSES
THERMONUCLEAR REACTOR MATERIALS
TUNGSTEN
US NATIONAL IGNITION FACILITY
VANADIUM
VANADIUM ALLOYS
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Summary:Tungsten (W) coating on fusion candidate V-4Cr-4Ti (NIFS-HEAT-2) substrate was demonstrated with plasma spray process for the purpose of applying to protection of the plasma facing surface of a fusion blanket. Increase in plasma input power and temperature of the substrate was effective to reduce porosity of the coating, but resulted in hardening of the substrate and degradation of impact property at 77 K. The hardening seemed to be due to contamination with gaseous impurities and deformation by thermal stress during the coating process. Since all the samples showed good ductility at room temperature, further heating seems to be acceptable for the vanadium substrate. The fracture stress of the W coating was estimated from bending tests as at least 313 MPa, which well exceeds the design stress for the vanadium structure in fusion blanket.
ISSN:1536-1055
1943-7641
DOI:10.13182/FST05-A797