Effects of Cf/C density on microstructure and properties of 3-D Cf/ZrC composites prepared by liquid metal infiltration |
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| Affiliation: | 1. 63981 Unit of PLA, Wuhan 430311, China;2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;1. Composites Research Group, Department of Mechanical Engineering, Durban University of Technology, Durban, South Africa;2. Composites Technology Centre, Department of Aerospace Engineering, Indian Institute of Technology, Madras, India;1. Department of Civil Engineering, University of Texas at Arlington, Box 19308, Arlington, TX 76019, USA;2. Innovative Engineering Associates, 18333 Preston Road, Suite 205, Dallas, TX 75252, USA;1. Department of Civil, Structural, and Environmental Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA;2. Material Science and Technology Division, Physical Sciences Directorate, Oak Ridge National Lab, Oak Ridge, TN 37831, USA;3. Department of Mechanical and Aerospace Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA |
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| Abstract: | Three-dimensional braided carbon fiber-reinforced ZrC matrix composites, 3-D Cf/ZrC, were fabricated by Liquid metal infiltration process at 1200 °C. Porous carbon/carbon (Cf/C) composites with various densities were used as preforms, and the effects of Cf/C density on microstructure and properties of the 3-D Cf/ZrC composites were investigated. The results show that the composites are composed of carbon, ZrC and residual metal. Both microstructure and properties of the 3-D Cf/ZrC composites are apparently affected by Cf/C density. With increasing density of Cf/C preform, the density of 3-D Cf/ZrC composites decreases while the open porosity increases. The composites obtained from the Cf/C preform with a density of 1.12 g/cm3 have the best mechanical properties, with flexural strength of 286.2 ± 11.4 MPa, elastic modulus of 83.5 ± 6.8 GPa and fracture toughness of 9.2 ± 0.6 MPa m1/2. The composites exhibit excellent ablation resistance, and the mass rate and the linear ablation rate under an oxyacetylene torch are as low as 5.1 ± 0.4 mg s−1 and 1.1 ± 0.3 μm s−1, respectively. |
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| Keywords: | A. Ceramic-matrix composites (CMCs) B. Mechanical properties B. Microstructures E. Liquid metal infiltration Ablation |
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