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2523 |
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Thursday, September 29, 2011, Saal C2.1 9:50 AM Tribological Coatings 2 |
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Effect of suspension characteristics on microstructure of suspension plasma sprayed SiC submicron coatings |
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Fahmi Mubarok* / Tribology Lab., IPM-NTNU, Norway Jouni Puranen/ Surface Engineering, Department of Materials Science, Tampere University of Technology, Finland Petri Vuoristo/ Surface Engineering, Department of Materials Science, Tampere University of Technology, Finland Roy Johnsen/ Department of Engineering Design and Materials, Norwegian University of Science and Technology (NTNU), Norway Nuria Espallargas/ Department of Engineering Design and Materials, Norwegian University of Science and Technology (NTNU), Norway |
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Plasma spraying of pure SiC is difficult due to decomposition issues at elevated temperatures. However, the development of suspension plasma spray opens a new path for deposition of this material since the liquid carrier can hinder this phenomenon. In the present work a new route for producing SiC submicron structured coating by suspension plasma spray is investigated. Classical SiC manufacturing routes using suspension (i.e: spray drying, tape casting) are investigated for their feasibility to be used on suspension plasma spraying. A water and solvent based suspension containing up to 20 vol% SiC powder (0.67 µm) along with sintering additives is dispersed and stabilized using specific dispersants. Both suspensions are sprayed on martensitic stainless steel substrate to achieve finely structured and dense coatings. Digital image analysis, X-ray diffraction and scanning electron microscopy are utilized to characterize the coating microstructures. Their dependency on suspension characteristics and spray operation parameters are discussed with respect to final coating performances. |