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

Abstract

Electrically insulating and corrosion-resistant coatings are required at the liquid metal/structural interface in fusion first-wall/blanket applications. The electrical resistance of CaO coatings produced on V-5%Cr-5%Ti by exposure of the alloy to liquid Li that contained 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 {ge}360{degrees}C.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (United States). Energy Technology Div.
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
224947
Report Number(s):
ANL/ET/CP-89407; CONF-960202-16
ON: TI96008412
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Technical Report
Resource Relation:
Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Anaheim, CA (United States), 4-8 Feb 1996; Other Information: PBD: Feb 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 36 MATERIALS SCIENCE; CALCIUM OXIDES; ELECTRIC CONDUCTIVITY; TITANIUM BASE ALLOYS; PROTECTIVE COATINGS; VANADIUM ALLOYS; CHROMIUM ALLOYS; THERMONUCLEAR REACTOR MATERIALS; LIQUID METALS; CORROSION RESISTANCE; BREEDING BLANKETS; FIRST WALL; ELECTRICAL INSULATION; LITHIUM

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. United States: N. p., 1996. Web. doi:10.2172/224947.
Park, J H, & Kassner, T F. CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium. United States. https://doi.org/10.2172/224947
Park, J H, and Kassner, T F. 1996. "CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium". United States. https://doi.org/10.2172/224947. https://www.osti.gov/servlets/purl/224947.
@article{osti_224947,
title = {CaO insulator coatings and self-healing of defects on V-Cr-Ti alloys in liquid lithium},
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. The electrical resistance of CaO coatings produced on V-5%Cr-5%Ti by exposure of the alloy to liquid Li that contained 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 {ge}360{degrees}C.},
doi = {10.2172/224947},
url = {https://www.osti.gov/biblio/224947}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {2}
}