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Tribological characterisation of siliconcarbonitride ceramics derived from preceramic polymers
Affiliation:1. Federal Institute for Materials Research and Testing (BAM), Berlin, Germany;2. Max-Planck Institute for Metals Research and Institute for Nonmetallic Inorganic Materials, University of Stuttgart, Stuttgart, Germany;1. Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Bauweisen und Strukturtechnologie, Pfaffenwaldring 38-40, 70569, Stuttgart, Germany;2. Technische Universität Darmstadt, Institut für Materialwissenschaft, Otto-Berndt-Str. 3, 64287, Darmstadt, Germany;1. SPCTS-CNRS, UMR 7315, Centre Européen de la Céramique, 12 rue Atlantis, F-87068 Limoges Cedex, France;2. Gordon Laboratory, Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Rd, CB3 0FS, UK;3. Laboratoire de Chimie de la Matière Condensée de Paris, Université Pierre et Marie Curie et CNRS, Collège de France, 11 Place Marcelin Berthelot, 75005 Paris, France;1. Department of Industrial Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy;2. Fachbereich Materialwissenschaft, Technische Universität Darmstadt, Jovanka-Bontschits-str. 02, 64287 Darmstadt, Germany
Abstract:Amorphous SiCN ceramics were prepared in a laboratory scale as disk shaped specimens with 10 mm diameter and 0.3 mm thickness. The friction and wear behaviour was characterised in gross slip fretting tests under unlubricated conditions at room temperature against steel (100Cr6) and ceramic (Al2O3). Tests with a ball-on-disk contact were performed in laboratory air with different content of water vapour. The results show clearly that the relative humidity has a significant effect on friction and wear behaviour. All tests in dry air lead to higher friction and higher wear rate than in normal air. Improved friction and wear behaviour was observed with increasing pyrolysis temperature up to 1100 °C of the SiCN specimens. This is attributed to increasingly better mechanical properties and higher stiffness of the amorphous network due to the evaporation of gaseous organic species and the formation of free graphite like carbon.
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