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Tribological performance of hard carbon coatings on 440C bearing steel

Abstract

Hard carbon coatings such as amorphous carbon, diamond and diamond-like carbon have received considerable attention for tribological applications owing to their high hardness, high modulus and desirable surface properties. Unfortunately, most of the deposition techniques induce high substrate temperatures that would temper traditional bearing steels and reduce the substrate load-carrying capability. Therefore, to effectively use these desirable coatings, a lower temperature deposition technique is required. Ion beam deposition can provide essentially ambient temperature conditions, accurate control of process parameters and good coating-substrate adhesion. To use these attributes, a test program was initiated to deposit mass-analyzed, high purity C{sup +} and CH{sub 4}{sup +} ions on molybdenum and 440C bearing steel for subsequent characterization by Raman spectroscopy and friction-wear tests. Results for a coating deposited from a carbon monoxide source showed an amorphous carbon-microcrystalline graphtie structure which exhibited very high microhardness and a three fold reduction in coefficient of friction for unlubricated tests compared to untreated 440C steel. In addition, incrementally increasing the applied load (by up to a factor of 5) resulted in progressively lower coefficients of friction, which conforms to solid lubrication theory. End-of-travel wear debris and some limited coating delamination were observed within thinner areas of the coating.  More>>
Authors:
Kustas, F M; Misra, M S; Shepard, D F; Froechtenigt, J F [1] 
  1. Martin Marietta Astronautics Group, Denver, CO (United States)
Publication Date:
Nov 01, 1991
Product Type:
Journal Article
Reference Number:
CHF-92-0F0257; EDB-92-033991
Resource Relation:
Journal Name: Surface and Coatings Technology; (Switzerland); Journal Volume: 48:2
Subject:
36 MATERIALS SCIENCE; CARBON; COATINGS; ADHESION; CARBON IONS; DEPOSITION; FRICTION; HARDNESS; ION BEAMS; LUBRICATION; MICROHARDNESS; STEELS; TEMPERING; WEAR; ALLOYS; BEAMS; CHARGED PARTICLES; ELEMENTS; HEAT TREATMENTS; IONS; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; NONMETALS; 360203* - Ceramics, Cermets, & Refractories- Mechanical Properties
OSTI ID:
5833295
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0257-8972; CODEN: SCTEE
Submitting Site:
HEDB
Size:
Pages: 113-119
Announcement Date:

Citation Formats

Kustas, F M, Misra, M S, Shepard, D F, and Froechtenigt, J F. Tribological performance of hard carbon coatings on 440C bearing steel. Switzerland: N. p., 1991. Web. doi:10.1016/0257-8972(91)90134-I.
Kustas, F M, Misra, M S, Shepard, D F, & Froechtenigt, J F. Tribological performance of hard carbon coatings on 440C bearing steel. Switzerland. doi:10.1016/0257-8972(91)90134-I.
Kustas, F M, Misra, M S, Shepard, D F, and Froechtenigt, J F. 1991. "Tribological performance of hard carbon coatings on 440C bearing steel." Switzerland. doi:10.1016/0257-8972(91)90134-I. https://www.osti.gov/servlets/purl/10.1016/0257-8972(91)90134-I.
@misc{etde_5833295,
title = {Tribological performance of hard carbon coatings on 440C bearing steel}
author = {Kustas, F M, Misra, M S, Shepard, D F, and Froechtenigt, J F}
abstractNote = {Hard carbon coatings such as amorphous carbon, diamond and diamond-like carbon have received considerable attention for tribological applications owing to their high hardness, high modulus and desirable surface properties. Unfortunately, most of the deposition techniques induce high substrate temperatures that would temper traditional bearing steels and reduce the substrate load-carrying capability. Therefore, to effectively use these desirable coatings, a lower temperature deposition technique is required. Ion beam deposition can provide essentially ambient temperature conditions, accurate control of process parameters and good coating-substrate adhesion. To use these attributes, a test program was initiated to deposit mass-analyzed, high purity C{sup +} and CH{sub 4}{sup +} ions on molybdenum and 440C bearing steel for subsequent characterization by Raman spectroscopy and friction-wear tests. Results for a coating deposited from a carbon monoxide source showed an amorphous carbon-microcrystalline graphtie structure which exhibited very high microhardness and a three fold reduction in coefficient of friction for unlubricated tests compared to untreated 440C steel. In addition, incrementally increasing the applied load (by up to a factor of 5) resulted in progressively lower coefficients of friction, which conforms to solid lubrication theory. End-of-travel wear debris and some limited coating delamination were observed within thinner areas of the coating. Therefore an amorphous carbon-graphite coating applied to 440C steel at ambient temperature exhibits solid lubricating film characteristics with high load-carrying capability. (orig.).}
doi = {10.1016/0257-8972(91)90134-I}
journal = {Surface and Coatings Technology; (Switzerland)}
volume = {48:2}
journal type = {AC}
place = {Switzerland}
year = {1991}
month = {Nov}
}