skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Development of electrical insulator coatings for liquid-metal blanket applications

Abstract

Based on a preliminary survey of more than 15 oxides and nitrides, four ceramic materials (CaO, MgO, Y{sup 2}O{sup 3}, and BN) were identified as candidates for insulator coating development. These compounds were fabricated by various techniques and exposed to flowing Li at 400-410{degrees} to assess chemical compatibility. Yttrium oxide exhibited excellent corrosion resistance in flowing liquid Li at 400{degrees}C; its corrosion rate was calculated to be 0.042 {mu}m/hr. Resistivity measurements by a standard four-probe method on Y{sup 2}O{sup 3} in air at temperatures between {approximately}450 and 1000{degrees}C, before and after exposure to Li for 675 h at 410{degrees}C, indicated no deterioration in resistivity. The resistivity of in-situ-formed (V,Ti){sup x}N reaction-product layers on V-20Ti and TiN on Ti was determined at room temperature and 80{degrees}C by a two-probe method. The resistivity of the film on the V-20Ti alloy was low ({approximately}20 {Omega}m) and the film on Ti exhibited metallic conduction. Adhesion bonding between Y{sup 2}O{sup 3} and Y, V, Ti, Y, V-20Ti, V-3Ti-1Si, and Types 304 and 316 stainless steel was investigated in reducing and oxidizing gaseous environments at 927{degrees}C. Except for the V-20Ti alloy, the V-base alloys, Ti, and Type 304 stainless steel were well bonded to Y{sup 2}O{supmore » 3} in the reducing atmosphere. In the oxidizing atmosphere, bond regions of Types 304 and 316 stainless steel were better than in the reducing atmosphere because of reaction between the oxide scale on the steels (Cr{sup 2}O{sup 3}) and Y{sup 2}O{sup 3} to form YCrO{sup 3}. Neither V, Ti, nor the V-alloys bonded with Y{sup 2}O{sup 3}. These results suggest that a low-melting eutectic layer forms between Y{sup 2}O{sup 3} and the oxides layers present on V, Ti, and V-alloys.« less

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
139234
Report Number(s):
DOE/ER-0313/13; ORNL/M-2722
ON: DE93013462; TRN: 93:001624-040
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: [1992]; Related Information: Is Part Of Fusion reactor materials semiannual progress report for period ending September 30, 1992; PB: 378 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 36 MATERIALS SCIENCE; BREEDING BLANKETS; PROTECTIVE COATINGS; THERMONUCLEAR REACTORS; OXIDES; NITRIDES; YTTRIUM; CORROSION RESISTANCE; ADHESION; BONDING; TEMPERATURE RANGE 0400-1000 K; CALCIUM OXIDES; MAGNESIUM OXIDES; YTTRIUM OXIDES; BORON NITRIDES; LITHIUM; ELECTRIC CONDUCTIVITY; TITANIUM; VANADIUM BASE ALLOYS; TITANIUM ALLOYS; VANADIUM; YTTERBIUM; SILICON ALLOYS; STAINLESS STEEL-304; STAINLESS STEEL-316; THERMONUCLEAR REACTOR MATERIALS; ELECTRICAL INSULATORS; PROGRESS REPORT

Citation Formats

Park, J H, Fox, M R, and Dragel, G. Development of electrical insulator coatings for liquid-metal blanket applications. United States: N. p., 1992. Web.
Park, J H, Fox, M R, & Dragel, G. Development of electrical insulator coatings for liquid-metal blanket applications. United States.
Park, J H, Fox, M R, and Dragel, G. 1992. "Development of electrical insulator coatings for liquid-metal blanket applications". United States.
@article{osti_139234,
title = {Development of electrical insulator coatings for liquid-metal blanket applications},
author = {Park, J H and Fox, M R and Dragel, G},
abstractNote = {Based on a preliminary survey of more than 15 oxides and nitrides, four ceramic materials (CaO, MgO, Y{sup 2}O{sup 3}, and BN) were identified as candidates for insulator coating development. These compounds were fabricated by various techniques and exposed to flowing Li at 400-410{degrees} to assess chemical compatibility. Yttrium oxide exhibited excellent corrosion resistance in flowing liquid Li at 400{degrees}C; its corrosion rate was calculated to be 0.042 {mu}m/hr. Resistivity measurements by a standard four-probe method on Y{sup 2}O{sup 3} in air at temperatures between {approximately}450 and 1000{degrees}C, before and after exposure to Li for 675 h at 410{degrees}C, indicated no deterioration in resistivity. The resistivity of in-situ-formed (V,Ti){sup x}N reaction-product layers on V-20Ti and TiN on Ti was determined at room temperature and 80{degrees}C by a two-probe method. The resistivity of the film on the V-20Ti alloy was low ({approximately}20 {Omega}m) and the film on Ti exhibited metallic conduction. Adhesion bonding between Y{sup 2}O{sup 3} and Y, V, Ti, Y, V-20Ti, V-3Ti-1Si, and Types 304 and 316 stainless steel was investigated in reducing and oxidizing gaseous environments at 927{degrees}C. Except for the V-20Ti alloy, the V-base alloys, Ti, and Type 304 stainless steel were well bonded to Y{sup 2}O{sup 3} in the reducing atmosphere. In the oxidizing atmosphere, bond regions of Types 304 and 316 stainless steel were better than in the reducing atmosphere because of reaction between the oxide scale on the steels (Cr{sup 2}O{sup 3}) and Y{sup 2}O{sup 3} to form YCrO{sup 3}. Neither V, Ti, nor the V-alloys bonded with Y{sup 2}O{sup 3}. These results suggest that a low-melting eutectic layer forms between Y{sup 2}O{sup 3} and the oxides layers present on V, Ti, and V-alloys.},
doi = {},
url = {https://www.osti.gov/biblio/139234}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {12}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: