Friction and wear performance of ion-beam deposited diamondlike carbon films on steel substrates
- Argonne National Lab., IL (United States). Materials and Components Technology Div.
- Colorado State Univ., Fort Collins, CO (United States). Dept. of Mechanical Engineering
In this study, we investigated the friction and wear performance of ion-beam-deposited diamondlike-carbon (DLC) films (1.5 [mu]m thick) on AISI 440C steel substrates. Furthermore, we ran a series of long-duration wear tests under 5, 10, and 20 N load to assess the load-bearing capacity and durability limits of these films under each load. Tests were performed on a ball-on-disk machine in open air at room temperature [approx] 22[plus minus]1[degrees]C, and humidity, [approx] 30[plus minus]5%. For the test conditions explored, we found that (1) the steady-state friction coefficients of pairs without a DLC film were in the range of 0.7 to 0.9 and the average wear rates of 440C balls (9.55 mm diameter) sliding against uncoated 440C disks were on the order of 10[sup [minus]5] mm[sup 3]/N.m, depending on contact load; (2) DLC films reduced the steady-state friction coefficients of test pairs by factors of 6 to 8, and the wear rates of pins by factors of 500 to 2000; (3) The wear of disks coated with a DLC film was virtually unmeasurable while the wear of uncoated disks was quite substantial, (4) these DLC films were able to endure the range of loads, 5 to 20 N, without any delamination and to last over a million cycles before wearing out. During long-duration wear tests, the friction coefficients were initially on the order of 0.15, but decreased to some low values of 0.05 to 0.07 after sliding for 15 to 25 km, depending on the load, and remained low until wearing out. This low-friction regime was correlated with the formation of a carbon-rich transfer film on the wear scar of 440C balls. Micro-laser-Raman spectroscopy and scanning-electron microscopy were used to examine the structure and chemistry of worn surfaces and to elucidate the wear- and friction-reducing mechanisms of the DLC film.
- Research Organization:
- Argonne National Lab., IL (United States). Materials and Components Technology Div.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6710624
- Report Number(s):
- ANL/MCT/CP-75881; CONF-920854-2; ON: DE93007896
- Resource Relation:
- Conference: 3. international conference on the new diamond science and technology and 3rd European conference on diamond, diamond-like and related coatings, Heidelberg (Germany), 31 Aug - 4 Sep 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
CARBON
FRICTION
WEAR
FILMS
HARDNESS
MATERIALS TESTING
MICROSTRUCTURE
RAMAN SPECTROSCOPY
STEELS
SUBSTRATES
TRIBOLOGY
ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
IRON ALLOYS
IRON BASE ALLOYS
LASER SPECTROSCOPY
MECHANICAL PROPERTIES
NONMETALS
SPECTROSCOPY
TESTING
360603* - Materials- Properties
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