Enhanced oxidation resistance of SiC/SiC minicomposites via slurry infiltration of oxide layers |
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| Affiliation: | 1. Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH, USA;2. Department of Mechanical Engineering, The University of Akron, Akron, OH, USA;3. Ceramic and Polymer Composites Branch, NASA Glenn Research Center, Cleveland, OH, USA;1. CEA Saclay, DEN, DMN, SRMA, LTMEx, 91191 Gif-sur-Yvette, France;2. CEA Saclay, DEN, DPC, SEARS, LISL, 91191 Gif-sur-Yvette, France;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;2. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. ShanghaiTech university, 100 Haike Road, Shanghai 201210, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. Analysis and Testing Center, Donghua University, Shanghai 201620, China;1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;2. Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;3. Technische Universität Darmstadt, Institut für Materialwissenschaft, Otto-Berndt-Str. 3, D-64287, Darmstadt, Germany |
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| Abstract: | SiC based composite materials commonly have protective silica surface in air. Under humid environments at high temperatures, like occur in jet engines, the silica surface layer reacts with water molecules to form volatile silicon hydroxide (Si(OH)4) and the protection is reduced which cause jet engine degradation. An alternative approach to protect SiC based composites would be to infiltrate the SiC matrix via slurry with an oxide material that is resistant to the high-temperature and humid environment. As proof of concept, aqueous based mullite particle slurries were infiltrated by pressurized flow and by capillarity of the wetting slurry on the external surface of the porous SiC matrix of single-fiber-tow SiC/SiC minicomposites. Minicomposites were precracked at room temperature during tensile tests then tested in tensile creep in air at 1200 °C to study the degree of protection that the infiltrated mullite provided at high temperatures. Next, fracture surfaces were examined using SEM. |
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| Keywords: | Ceramic matrix minicomposites Mullite coating Slurry infiltration Oxidation resistance Creep resistance |
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