Effect of pH on wear and friction of silicon nitride sliding against alumina in water |
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| Affiliation: | 1. Department of Mechanical Engineering, 10-203 Donadeo Innovation Centre for Engineering, 9211-116 Street NW, Edmonton, AB T6G 1H9, Canada;2. Laboratoire de Sciences et Ingénierie de la Matière Molle, CNRS, ESPCI Paris, PSL Research University, 10 rue Vauquelin, Paris 75005, France;3. Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309, USA;1. South China University of Technology, Guangzhou 510640, China;2. The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China;2. College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China |
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| Abstract: | The influence of the pH in water lubricated sliding contacts was evaluated in terms of friction and wear. The experiments were carried out using a ball-on-disc setup. Si3N4 balls and Al2O3 discs were tested at temperature of (22±2) °C, sliding speed of (1.00±0.03) m/s and normal load of (54.25±0.17) N. Eight types of water with pHs varying from 3 to 12 were used as lubricant. The running-in period, friction coefficient and wear-volume were shown to be nearly independent of the initial pH values within the DLVO range (4≤pH≤10), since at these range the water׳s pH tends to the same value (7.6±0.3) during the test. Superlubricity could be reached with negligible wear by properly setting the electrochemical properties and operating conditions of the tribosystem. |
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| Keywords: | Sliding wear Ceramics Water lubrication Superlubricity |
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