Design and optimization of the coating thickness on chopped carbon fibers and sintering temperature for ZrB2-SiC-Cf composites prepared by hot pressing |
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| Affiliation: | 1. Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Chaoma Technology Co. Ltd, Xi′an Aerospace Composite Material Institute, Xi′an 710025, China;1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran;3. School of Chemical and Biological Engineering, College of Engineering, Seoul National University, Seoul 151-742, South Korea;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, and Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China;2. Harbin University of Science and Technology, Harbin, 150080, China;1. Harbin Institute of Technology, Harbin 150001, PR China;2. China Academy of Launch Vehicle Technology, Beijing 100076, PR China |
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| Abstract: | Interface designation and low-temperature densifying were expected to inhibit the performance attenuation of fiber in the preparation of ceramic matrix composites. Nevertheless, the optimization of interface thickness and sintering temperature were still rarely investigated systematically. Herein, the performance of carbon fiber varied with coating thickness and the heat-treat temperatures were investigated by quantitatively. The tensile strength of carbon fibers degraded dramatically (≥30%) when coating thickness above a critical value. A larger dimension and ordered graphite crystallite structure resulted in the severe performance deterioration of carbon fibers as the sintering temperature exceeding 1500 ℃. The PyC coatings with an appropriate thickness acted as a critical role of changing the fracture mode of the ZrB2-SiC-Cf and noticeably increased the fracture strain of the composite. The regular trend provided a general design strategy in construction of ZrB2-SiC-Cf composite with optimal properties and could be extended to other ceramic matrix composites. |
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| Keywords: | PyC coating Interface designation Sintering temperature Performance attenuation |
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