Rapid densification of C/SiC composites by joint processes of CLVD and PIP |
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| Authors: | Si'an Chen Haifeng Hu Yudi Zhang Xinbo He Min Mei |
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| Affiliation: | 1. CFC Lab, College of Aerospace & Materials Engineering, National University of Defense Technology, Changsha 410073, China;2. Institute of powder metallurgy, University of Science and Technology Beijing, Beijing 100083, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;2. Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. Department of Engineering Mechanics, Harbin University of Science and Technology, Harbin 150080, PR China;2. School of Aerospace Engineering, Beijing Institute of Technology, 100081 Beijing, PR China;1. School of Materials Science and Engineering, Xiangtan University, Hunan 411105, PR China;2. Department of Earth and Environmental Engineering, Columbia University, NY 10027, United States;3. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, PR China;4. State Key Lab for Turbulence and Complex Systems, Peking University, Beijing 100871, PR China;1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500 058, India;2. Centre for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500005, India |
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| Abstract: | C/SiC composites were prepared by joint processes of chemical liquid–vapor deposition (CLVD) for 3 h and Precursor Infiltration and Pyrolysis (PIP) for 5 cycles, with a density of 1.97 g/cm3, a flexural strength of 297 ± 26 MPa and a preparation period of only 10 days. CLVD process combines the advantages of both continual vapor deposition of chemical vapor infiltration process and high liquid infiltration efficiency of PIP process, thus in 3 h the composite reaches a density of 1.75 g/cm3. SiC matrix in CLVD process prefers to deposit into small pores in bundles, while in PIP process into large pores between bundles and layers, thus a homogeneous structure is quickly obtained by joint processes. Furthermore the composite by CLVD process usually shows density gradient during the deposition front propagation, and post PIP process which is not sensitive with thickness, makes up this drawback. |
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