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Polymer derived SiC environmental barrier coatings with superwetting properties
Affiliation:1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072 China;2. State Key Laboratory of Traction Power, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan, 610031 China;1. NOCCD, CSIR-CGCRI, 196 Raja S C Mullick Road, Kolkata 700032, West Bengal, India;2. Material Science and Engineering, National University of Singapore, Singapore 117576, Singapore;3. Applied Chemistry Division, DMSRDE (DRDO), Kanpur 208013, UP, India;1. Empa, Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, Duebendorf, Switzerland;2. Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland;3. Microsystems Laboratory, EPFL, Station 17, CH-1015 Lausanne, Switzerland;4. Clinic for Cardiovascular Surgery, Inselspital Berne, Berne University Hospital and University of Berne, Berne, Switzerland;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China;3. Northwest Institute of Nuclear Technology, Xi’an 710024, China;4. State Key Laboratory of Laser Interaction with Matter, Xi’an 710024, China;1. CSIR-Central Glass and Ceramic Research Institute, Jadavpur, Kolkata 700032, India;2. Jadavpur University, Kolkata 700032, India;3. Defence Materials & Stores Research & Development Establishment, Kanpur 208013, India;1. Federal University of Santa Catarina, Department of Chemical Engineering and Food Engineering, Trindade, 88010-970, Florianópolis, SC, Brazil;2. University of Bayreuth, Ceramic Materials Engineering (CME), D-95440 Bayreuth, Germany;3. Federal University of Santa Catarina, Department of Chemistry, Trindade, 88040-900, Florianópolis, SC, Brazil
Abstract:Surfaces with superwetting capabilities can be used for corrosion protection, self-cleaning and bio-fouling protection amongst other applications. In this work, we present a method to produce a SiC coating with an almost superhydrophobic behavior exhibiting water contact angles of 145±3°. Ceramic coatings were produced by the pyrolysis of polycarbosilane as a preceramic precursor of SiC. Aluminum and carbon powders were used as active and passive fillers to compensate for the volume shrinkage of polycarbosilane during pyrolysis. The effects of particle size (Al particles ranging from 0.8 to 10 µm) and concentration 10–30% wt.) C and Al of both fillers were studied to produce defect-free ceramic coatings. We have observed that the fillers used not only affected the microstructure but also the surface roughness. We show that the addition of carbon fillers can increase the water contact angle of the ceramic from 42° up to 141°. The combination of carbon and aluminum fillers resulted in water contact angles up to 145°.
Keywords:Polycarbosilane  Silicon carbide  Coating  Filler materials  Ceramic precursor  Hydrophobic surface
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