Rheological behaviour of submicron mullite–carbon nanofiber suspensions for Atmospheric Plasma Spraying coatings |
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| Affiliation: | 1. Thermal Spray Center (CPT), Universitat de Barcelona, 08028 Barcelona, Spain;2. Instituto de Cerámica y Vidrio, CSIC, 28049 Madrid, Spain;1. Tata Steel R&D, PO Box 10000, 1970CA, IJmuiden, The Netherlands;2. Ecole Nationale Supérieure de Céramique Industrielle (ENSCI), Centre Européen de la Céramique (CEC), rue Atlantis 12, 87068 Limoges, France;1. International Advanced Research and Education Organization, Tohoku University, Sendai 980-8578, Japan;2. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), China;3. Division of HSE Department, Aluminum Corporation of China, Beijing 100082, China;1. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Dresden, Germany;2. Technische Universität Bergakademie Freiberg, Institute of Energy Process Engineering and Chemical Engineering, Freiberg, Germany |
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| Abstract: | Mullite is widely used as a structural material for applications like thermal and environmental barriers coatings. For some of these applications, thermal spray is a suitable technique due to its fast production time and versatility. This makes mullite a very interesting coating material for thermal spray industry. In the present work, the viability to produce coatings by thermal spray using mullite–CNFs agglomerated powders is analyzed. The stability of aqueous mullite and mullite–CNFs suspensions was studied in terms of zeta potential and rheological behaviour of concentrated slurries. Slurries were optimized in terms of dispersant concentration and solid content. The optimized suspensions were used for the granules preparation by spray drying technology. The obtained granules were characterized through the determination of particle size distribution and shape factor by field emission scanning electron microscopy and laser scattering. These granules were used to form the coatings by Atmospheric Plasma Spraying which were characterized by evaluating the composition, structure, shape, and thickness. |
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| Keywords: | Suspensions Rheology Mullite CNF Thermal spray coatings |
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