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Organisationseinheit der BAM
Eingeladener Vortrag
- nein (110)
Tribologisches Hochtemperaturverhalten keramischer Werkstoffe unter Festkörperreibungsbedingungen
(1988)
This paper presents the friction and wear behaviour of monolithic titanium-molybdenum carbonitride and tungsten carbide. These materials have been tested sliding against themselves, carbons, fibre reinforced glasses and molybdenum coatings and compared to other ceramics and ceramics composites under unlubricated condition up to 800 °C and 6 m/s.
Self-mated sliding couples of titanium-molybdenum carbonitride display, especially under high-temperature friction, a pronounced wear resistance compared to ceramics and ceramicceramic composites. This very good property is due to the tribo-oxidative formation of so-called lubricious oxides, e.g. Magnéli phases of rutile. They exhibit sliding wear rates under unlubricated friction up to 800 °C as known from mixed/boundary lubrication.
Within the different test conditions, the wear rates of a variety of stationary monolithic materials samples sliding against rotating specimen of (Ti, Mo)(C, N) are always in the group with the lowest wear rates.
The association of the wear resistance, mechanical strength, fracture toughness and low density makes the (Ti, Mo)(C, N) material a complete solution for complex customer demands.
The results presented in this paper have clarified experimentally, that titania-based Magnéli-phases (Ti4O7/Ti5O9 and Ti6O11) with (121)-shear planes exhibit more anti-wear properties than lubricious (low-frictional) properties. The results for dry sliding indicate that the coefficients of friction lie in the range of 0.10.6 depending on sliding speed and ambient temperature. The COF decreased with increasing temperature (T= 22800°C) and increasing sliding speed (?= 1-6 m/s). The dry sliding wear rate was lowest for the Al2O3 at 1 m/s at 800°C with values of 1.7 × 10-8 and 6.4 × 10-8 mm3/N m, comparable to boundary/mixed lubrication, associated with a high dry frictional power loss of 30 W/mm2. The running-in wear length and, more important, the wear rate decreased under oscillating sliding tests with increasing relative humidity. The contact pressure for high-/low-wear transition increased under oscillating sliding tests with increasing relative humidity. At room temperature and a relative humidity of 100% the steady-state wear rate under dry oscillating sliding for the couple Al2O3/Ti4O7Ti5O9 was lower than 2 × 10-7 mm3/N m and therefore inferior to the resolution of the continuous wear measurement sensor. TEM of wear tracks from oscillating sliding revealed at room temperature a work-hardening as mechanism to explain the running-in behavior and the high wear resistance. The hydroxylation of titania surfaces favours the high-/low-wear transition.