Tribological and arc erosion behaviors of copper-refractory metal in situ composites
Tribological and arc erosion behaviors of Cu-Nb and Cu-Cr in situ composites were investigated in this dissertation. Dry sliding tests were performed in a pin-on-disk wear tester with the composites rubbing against a rotating tool steel disk under ambient conditions with a pressure of 0.68 M Pa, sliding speeds up to 2.5 m/s, and electrical current densities up to 2.89 MA/m{sup 2}. Electrical arc erosion tests were performed in a make-and-break test set-up and a high-energy stationary arc gap test facility. Sliding friction and wear behaviors of Cu-Nb composites with and without electrical loads were studied in terms of the effects of composition, filament orientation, true deformation strain, sliding speed and annealing temperature. The Cu-20vol.%Nb composite had the best wear resistance among the compositions studied in both cases. Subsurface deformation was revealed by the presence of filaments and was one of the wear mechanisms for the composites. No debonding was observed in the composites during sliding. The presence of electrical current increased the temperature and promoted oxidation on wear surfaces. The contact behavior of Cu-Nb composites against tool steel was studied in terms of the contact resistance and temperature rise. Surface oxide film development, wear particle accumulation, and unsteady contact caused by sliding were found to be the major factors governing electrical contact resistance and, therefore, temperature rise. Arc erosion behavior of the composites was also investigated.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE; US Department of Commerce
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5344976
- Report Number(s):
- IS-T-1564; ON: DE91018286
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHROMIUM ALLOYS
COMPOSITE MATERIALS
COPPER ALLOYS
CURRENTS
DATA ACQUISITION
ELECTRIC ARCS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRICAL PROPERTIES
ELEMENTS
EROSION
FRICTION
MATERIALS
METALS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
REFRACTORY METALS
SHEAR
SLIDING FRICTION
TRIBOLOGY
WEAR