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Title: The hardness, adhesion, and wear resistance of coatings developed for cobalt-base alloys

Abstract

One potential approach for reducing the level of nuclear plant radiation exposure that results from activated cobalt wear debris is the use of a wear resistant coating. However, large differences in stiffness between a coating/substrate can result in high interfacial stresses that produce coating de-adhesion when a coated substrate is subjected to high stress wear contact. Scratch adhesion and indentation tests have been used to identify four promising coating processes [1,2]: (1) the use of a thin Cr-nitride coating with a hard and less-stiff interlayer, (2) the use of a thick, multilayered Cr-nitride coating with graded layers, (3) use of the duplex approach, or nitriding to harden the material subsurface followed by application of a multilayered Cr-nitride coating, and (4) application of nitriding alone. The processing, characterization, and adhesion of these coating systems are discussed. The wear resistance and performance has been evaluated using laboratory pin-on-disc, 4-ball, and high stress rolling contact tests. Based on the results of these tests, the best coating candidate from the high-stress rolling contact wear test was the thin duplex coating, which consists of ion nitriding followed deposition of a thin Cr-nitride coating, while the thin Cr-nitride coating exhibited the best results in the 4-ballmore » wear test.« less

Authors:
;
Publication Date:
Research Org.:
Bettis Atomic Power Lab., West Mifflin, PA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
770647
Report Number(s):
B-T-3294
TRN: AH200131%%389
DOE Contract Number:  
AC11-98PN38206
Resource Type:
Journal Article
Journal Name:
Journal of Surface and Coating Technology
Additional Journal Information:
Other Information: Submitted to Journal of Surface and Coating Technology; PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADHESION; ALLOYS; COATINGS; COBALT; DEPOSITION; HARDNESS; PERFORMANCE; RADIATIONS; ROLLING; STRESSES; SUBSTRATES; SURFACE COATING; WEAR RESISTANCE; COBALT-BASED ALLOYS

Citation Formats

Cockeram, B.V., and Wilson, W.L. The hardness, adhesion, and wear resistance of coatings developed for cobalt-base alloys. United States: N. p., 2000. Web.
Cockeram, B.V., & Wilson, W.L. The hardness, adhesion, and wear resistance of coatings developed for cobalt-base alloys. United States.
Cockeram, B.V., and Wilson, W.L. Mon . "The hardness, adhesion, and wear resistance of coatings developed for cobalt-base alloys". United States. https://www.osti.gov/servlets/purl/770647.
@article{osti_770647,
title = {The hardness, adhesion, and wear resistance of coatings developed for cobalt-base alloys},
author = {Cockeram, B.V. and Wilson, W.L.},
abstractNote = {One potential approach for reducing the level of nuclear plant radiation exposure that results from activated cobalt wear debris is the use of a wear resistant coating. However, large differences in stiffness between a coating/substrate can result in high interfacial stresses that produce coating de-adhesion when a coated substrate is subjected to high stress wear contact. Scratch adhesion and indentation tests have been used to identify four promising coating processes [1,2]: (1) the use of a thin Cr-nitride coating with a hard and less-stiff interlayer, (2) the use of a thick, multilayered Cr-nitride coating with graded layers, (3) use of the duplex approach, or nitriding to harden the material subsurface followed by application of a multilayered Cr-nitride coating, and (4) application of nitriding alone. The processing, characterization, and adhesion of these coating systems are discussed. The wear resistance and performance has been evaluated using laboratory pin-on-disc, 4-ball, and high stress rolling contact tests. Based on the results of these tests, the best coating candidate from the high-stress rolling contact wear test was the thin duplex coating, which consists of ion nitriding followed deposition of a thin Cr-nitride coating, while the thin Cr-nitride coating exhibited the best results in the 4-ball wear test.},
doi = {},
journal = {Journal of Surface and Coating Technology},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}