Oxidation resistance and thermal stability of Ti(C,N) and Ti(C,N,O) coatings deposited by chemical vapor deposition |
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| Affiliation: | 1. School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road, Shanghai 200072, PR China;2. Kennametal Inc., 1600 Technology Way, Latrobe, PA 15650, USA;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai, 201620, PR China;2. Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai, 200050, PR China;3. Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom;1. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Straße 18, Leoben A-8700, Austria;2. Materials Center Leoben Forschung GmbH, Roseggerstraße 12, Leoben A-8700, Austria;3. Department of Materials Physics, Montanuniversität Leoben, Jahnstrasse 12, Leoben A-8700, Austria;4. CERATIZIT Austria GmbH, Metallwerk-Plansee-Straße 71, Reutte A-6600, Austria;5. European Synchrotron Radiation Facility, Cedex 9, Grenoble F-38043, France;6. Department of Analytical Chemistry, Ghent University, Krijgslaan 281, S12, Ghent B-9000, Belgium;7. CERATIZIT Luxembourg S.àr.l., Route de Holzem, B.P.51, Mamer L-8201, Luxembourg;1. Technische Universität Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-CT, A-1060 Vienna, Austria;2. Boehlerit GmbH & Co. KG, Forschung & Entwicklung, Werk VI Straße 100, A-8605 Kapfenberg, Austria |
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| Abstract: | Ti0.51C0.24N0.25 and Ti0.51C0.26N0.21O0.02 coatings were deposited by medium temperature chemical vapor deposition, their oxidation resistance and thermal stability at 600 °C were compared. Ti(C,N,O) coating is oxidized faster than Ti(C,N) coating. The oxidation resistance of Ti(C,N,O) coating is impaired not only by the existence of more pores, fissures and cracks in the oxide layer, but also by lower interfacial adhesion. Higher tensile stress has a negative impact on the oxidation resistance of Ti(C,N,O) coating. It promotes the formation and development of more defects and cracks during cyclic oxidation, it is also harmful to the interfacial adhesion. Although the oxidation resistance of Ti(C,N,O) coating is inferior, the thermal stability is improved. The incorporation of oxygen slows down the phase transformation of Ti(C,N,O) at 600 °C. During the annealing, the hardness of Ti(C,N,O) coating is always higher than that of Ti(C,N). |
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