Development of wear-resistant ceramic coatings for diesel engine components. Volume 1, Coating development and tribological testing: Final report: DOE/ORNL Ceramic Technology Project
- Cummins Engine Co., Inc., Columbus, IN (United States)
The tribological properties of a variety of advanced coating materials have been evaluated under conditions which simulate the piston ring -- cylinder liner environment near top ring reversal in a heavy duty diesel engine. Coated ``ring`` samples were tested against a conventional pearlitic grey cast iron liner material using a high temperature reciprocating wear test rig. Tests were run with a fresh CE/SF 15W40lubricant at 200 and 350{degrees}C, with a high-soot, engine-tested oil at 200{degrees}C and with no lubrication at 200{degrees}C. For lowest wear under boundary lubricated conditions, the most promising candidates to emerge from this study were high velocity oxy-fuel (HVOF) Cr{sub 3} C{sub 2} - 20% NiCr and WC - 12% Co cermets, low temperature arc vapor deposited (LTAVD) CrN and plasma sprayed chromium oxides. Also,plasma sprayed Cr{sub 2}O{sub 3} and A1{sub 2}O{sub 3}-ZrO{sub 2} materials were found to give excellent wear resistance in unlubricated tests and at extremely high temperatures (450{degrees}C) with a syntheticoil. All of these materials would offer substantial wear reductions compared to the conventional electroplated hard chromium ring facing and thermally sprayed metallic coatings, especially at high temperatures and with high-soot oils subjected to degradation in diesel environments. The LTAVD CrN coating provided the lowest lubricated wear rates of all the materials evaluated, but may be too thin (4 {mu}m) for use as a top ring facing. Most of the coatings evaluated showed higher wear rates with high-soot, engine-tested oil than with fresh oil, with increases of more than a factor of ten in some cases. Generally, metallic materials were found to be much more sensitive to soot/oil degradation than ceramic and cermet coatings. Thus, decreased ``soot sensitivity`` is a significant driving force for utilizing ceramic or cermet coatings in diesel engine wear applications.
- Research Organization:
- Oak Ridge National Lab., TN (United States); Cummins Engine Co., Inc., Columbus, IN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10176352
- Report Number(s):
- ORNL/Sub--87-SA581/1; ON: DE92041382
- Country of Publication:
- United States
- Language:
- English
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Development of wear resistant ceramic coatings for diesel engine components
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Related Subjects
330102
36 MATERIALS SCIENCE
360201
360203
360204
ALUMINIUM OXIDES
CERAMICS
CERMETS
CHROMIUM ALLOYS
CHROMIUM CARBIDES
COATINGS
DIESEL
DIESEL ENGINES
LINERS
MATERIALS TESTING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
PHYSICAL PROPERTIES
PLASMA ARC SPRAYING
PREPARATION AND FABRICATION
PROGRESS REPORT
SPUTTERING
THERMODYNAMIC PROPERTIES
TRIBOLOGY
TUNGSTEN CARBIDES
WEAR
ZIRCONIUM OXIDES