Fabrication and characterization of three dimensional woven carbon fiber/silica ceramic matrix composites |
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Affiliation: | 1. NASA Glenn Research Center, Cleveland, OH 44135, USA;2. Department of Mechanical Engineering, The University of Akron, Akron, OH 44325, USA |
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Abstract: | Carbon fiber reinforced fused silica composites exhibit the advantages of excellent mechanical properties, high heat resistance, low thermal expansion and low density, but low impact resistance or toughness. A novel modified slurry impregnation and hot pressing (SIHP) method was adopted to fabricate a new type of three dimensional orthogonal woven structure carbon fiber reinforced silica ceramic matrix composites (3D Cf/SiO2 CMCs) with higher density and lower porosity. Physical characterization, flexural behavior, impact performance and toughening mechanism of the composites were investigated by three-point bending tests, impact tests, and scanning electron microscopy analysis. The 3D Cf/SiO2 CMC showed a higher flexural strength in both warp (201.6%) and weft (263.6%) directions than those of pure SiO2 and failed at a non-brittle mode due to the fiber debonding and pullout, and a delaminated failure of the 3D preform. The maximum impact energy absorption of the 3D Cf/SiO2 CMC was 96.9 kJ/m2, almost 4 times as much as those for typical other carbon fiber reinforced CMCs. |
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Keywords: | A Ceramic–matrix composites A 3-Dimensional reinforcement B Impact behavior Three point bending E Sintering |
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