Mechanical properties of silicon nitride rolling elements in dependence of size and shape |
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| Affiliation: | 1. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia;3. Federal Institute for Materials Research and Testing, Unter den Eichen 44-4612203, Berlin, Germany;4. Institute of Nonmetallic Materials, Clausthal University of Technology, Zehntnerstr. 2a, Clausthal-Zellerfeld 38678, Germany;1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. SKF Engineering and Research Centre, Nieuwegein, The Netherlands;2. Université de Lyon, INSA-Lyon, CNRS, LaMCoS UMR5259, F69621, France;1. Department of Chemical and Process Engineering, Bilecik S.E. University, Bilecik, Turkey;2. Metallurgy Program, Bilecik S.E. University, Bilecik, Turkey;3. Department of Metallurgical and Materials Engineering, Bilecik S.E. University, Bilecik, Turkey |
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| Abstract: | Silicon nitride rolling elements for hybrid bearings (rollers, two sizes of balls and plate material as a reference) made from the same material lot and using the same sintering route are investigated in regard to their microstructure and their mechanical properties. For the first time, a direct comparison of the surface strength of the components as well as of their fracture toughness is enabled by recently developed testing methods for balls and rollers.It was found that the microstructure of these material variants influences the fracture toughness up to about 10%. In addition, due to the different surface finish, the surface strength of the different rolling elements (made of the same material) is very different. The differences may reach up to 100% and more. |
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| Keywords: | Mechanical characterization Strength testing Fracture toughness Silicon nitride Ceramic rolling elements |
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