Triboactive materials for dry reciprocating sliding motion at ultra-high frequency |
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| Authors: | Dirk Spaltmann Manfred Hartelt Mathias Woydt |
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| Affiliation: | 1. Institute of Physics of Materials, AS CR, Czech Republic;2. CEITEC IPM, Institute of Physics of Materials AS CR, Czech Republic;1. School of Materials Science and Engineering, The University of Shanghai for Science and Technology, Shanghai, China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;3. School of Materials Science and Engineering, Nanjing University for Science and Technology, Nanjing, Jiansu, China;4. Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA;1. Key Laboratory of Cryogenics, TIPC, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Nanotechnology M.Sc. Program, American University in Cairo, AUC Av., P.O. Box 74, 11835 New Cairo, Egypt;2. Mechanical Engineering Department, American University in Cairo, AUC Av., P.O. Box 74, 11835 New Cairo, Egypt |
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| Abstract: | High-power piezo-electric motors with power densities of 1.4 kW/kg display a potential for substituting hydraulic actuators. For this application, two novel tribometers of the same type have been designed using commercially available components for sliding motion at 40 kHz with amplitudes between 2.5 μm and 5 μm. The tribometers are equipped with means to measure amplitude, frequency, power required to keep the samples in motion and load applied. The effective motion between the two contacting bodies is monitored in each of the tribometers. These data are used to evaluate the coefficient of friction. The wear rate was determined after the tests. The set-ups were tested using well-known 100Cr6H (AISI 52100) samples before investigating novel, non-commercial substrates such as AlFeCrTi-alloys and tungsten carbide-based coatings as well as Magnéli-type coatings (Tin?2Cr2O2n?1 and TinO2n?1). This paper presents the principle of the ultra-high frequency tribometers and first tribological quantities of materials and coatings tested up to and above 1011 cycles. Very low wear rates in the range 10?8 mm3/Nm down to 10?10 mm3/Nm were determined under dry oscillation in air. |
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