Initial Characterization of V-4Cr-4Ti and MHD Coatings Exposed to Flowing Li

Conference · Thu Jan 01 04:00:00 EST 2009

OSTI ID:951919

Pint, Bruce A ^[1]; Pawel, Steven J ^[1]; Howell, Michael ^[1]; Moser, Jeremy L ^[1]; Garner, George Walter ^[1]; Santella, Michael L ^[1]; Tortorelli, Peter F ^[1]; Wiffen, Frederick W ^[1]; Distefano, James R ^[1]

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1. ORNL

Conduct an experiment with flowing Li in a thermal gradient to determine the compatibility of V-4Cr-4Ti and a multi-layer electrically-insulating coating needed to reduce the magneto hydrodynamic (MHD) force in the first wall of a lithium cooled blanket. A mono-metallic V-4Cr-4Ti thermal convection loop was operated in vacuum ({approx}10{sup -5}Pa) at a maximum Li temperature of 700 C for 2,355h and Li flow rate of 2-3 cm/s. Two-layer, physical vapor deposited Y{sub 2}O{sub 3}-vanadium, electrically-insulating coatings on V-4Cr-4Ti substrates as well as uncoated tensile and sheet specimens were located in the flow path in the hot and cold legs. After exposure, specimens at the top of the hot leg showed a maximum mass loss equivalent to {approx}1.3 {micro}m of uniform metal loss. Elsewhere, small mass gains were observed on the majority of specimens that also showed an increase in hardness and room temperature yield stress and a decrease in ductility consistent with interstitial uptake. Specimens that lost mass showed a decrease in yield stress and hardness. Profilometry showed no significant thickness loss from the coatings.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 951919
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COATINGS
COMPATIBILITY
CONVECTION
Coatings
Compatibility
DUCTILITY
FIRST WALL
FLOW RATE
HARDNESS
HYDRODYNAMICS
INTERSTITIALS
LEGS
LITHIUM
Li
Liquid Metal
SUBSTRATES
TEMPERATURE GRADIENTS
THICKNESS
Vanadium