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Title: CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium system

Abstract

Electrically insulating and corrosion-resistant coatings are required at the liquid metal/structural interface in fusion first-wall/blanket applications. Electrical resistance of CaO coatings that were produced on V-5%Cr-5%Ti by exposure of the alloy to liquid Li containing 0.5-85 wt.% dissolved Ca was measured as a function of time at temperatures between 250 and 600{degrees}C. The solute element, Ca in liquid Li, reacted with the alloy substrate at 400-420{degrees}C to produce a CaO coating. Resistance of the coating layer measured in-situ in liquid Li was {approx}10{sup 6} {Omega} at 400{degrees}C. Thermal cycling between 300 and 700{degrees}C changed the coating layer resistance, which followed insulator behavior. These results suggest that thin homogeneous coatings can be produced on variously shaped surfaces by controlling the exposure time, temperature, and composition of the liquid metal. The technique can be applied to various shapes (e.g., inside/outside of tubes, complex geometrical shapes) because the coating is formed by liquid-phase reaction. Examination of the specimens after cooling to room temperature revealed no spallation, but homogeneous crazing cracks were present in the CaO coating. Additional tests to investigate the in-situ self-healing behavior of the cracks indicated that rapid healing occurred at {>=}360{degrees}C.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
135125
Report Number(s):
ANL/ET/CP-86377; CONF-950961-2
ON: DE96002549; TRN: 96:001230
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: ICFRM-7: international conference on fusion reactor materials, Obninsk (Russian Federation), 25-29 Sep 1995; Other Information: PBD: Sep 1995
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 36 MATERIALS SCIENCE; FIRST WALL; PROTECTIVE COATINGS; CALCIUM OXIDES; ELECTRICAL INSULATION; CORROSION RESISTANCE; THERMONUCLEAR REACTOR MATERIALS; BREEDING BLANKETS; VANADIUM BASE ALLOYS; LITHIUM; TEMPERATURE DEPENDENCE

Citation Formats

Park, J H, and Kassner, T F. CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium system. United States: N. p., 1995. Web.
Park, J H, & Kassner, T F. CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium system. United States.
Park, J H, and Kassner, T F. 1995. "CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium system". United States. https://www.osti.gov/servlets/purl/135125.
@article{osti_135125,
title = {CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium system},
author = {Park, J H and Kassner, T F},
abstractNote = {Electrically insulating and corrosion-resistant coatings are required at the liquid metal/structural interface in fusion first-wall/blanket applications. Electrical resistance of CaO coatings that were produced on V-5%Cr-5%Ti by exposure of the alloy to liquid Li containing 0.5-85 wt.% dissolved Ca was measured as a function of time at temperatures between 250 and 600{degrees}C. The solute element, Ca in liquid Li, reacted with the alloy substrate at 400-420{degrees}C to produce a CaO coating. Resistance of the coating layer measured in-situ in liquid Li was {approx}10{sup 6} {Omega} at 400{degrees}C. Thermal cycling between 300 and 700{degrees}C changed the coating layer resistance, which followed insulator behavior. These results suggest that thin homogeneous coatings can be produced on variously shaped surfaces by controlling the exposure time, temperature, and composition of the liquid metal. The technique can be applied to various shapes (e.g., inside/outside of tubes, complex geometrical shapes) because the coating is formed by liquid-phase reaction. Examination of the specimens after cooling to room temperature revealed no spallation, but homogeneous crazing cracks were present in the CaO coating. Additional tests to investigate the in-situ self-healing behavior of the cracks indicated that rapid healing occurred at {>=}360{degrees}C.},
doi = {},
url = {https://www.osti.gov/biblio/135125}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {9}
}

Conference:
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