High temperature tribology of heavily boron doped diamond films against steel |
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| Affiliation: | 1. State Key Laboratory of Mechanical Systems and Vibrations, Shanghai Jiao Tong University, Shanghai 200240, China;2. National Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China;3. China Aerodynamics Research and Development Center, Mianyang 621000, China;4. National Engineering Research Center for Mechanical Product Remanufacturing, Army Academy of Armored Forces, Beijing, 100072, China |
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| Abstract: | Despite the fact that Fe, Co, and Ni catalyze the phase transition of diamond into graphite, the question of the applicability of diamond as a functional coating of a metal-cutting tool is still open. For this reason, our work contains investigation of wear and friction of heavily boron doped diamond films against steel at elevated temperature, as well as influence of boron concentration on diamond film oxidation resistance. The obtained data indicated that minimum CoF value is achieved in the temperature range within 570–670 °C and strongly depends on boron concentration in coating (CoF decreases with increasing of boron concentration). Wear rate has the same dependence as the CoF, whereas oxidation resistance decreases with increasing of boron concentration. Besides, the presented results are first obtained for boron doped diamond films synthesized under high B/C ratio conditions (of up to 333 ppb). |
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