A Numerical Study of Densification Behavior of Silicon Carbide Matrix Composites in Isothermal Chemical Vapor Infiltration
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We studied the characteristics of two-scale pore structure of preform in the deposition process and the mass transfer of reactant gas in dual-scale pores, and observed the physiochemical phenomenon associated with the reaction. Thereby, we established mathematical models on two scales, respectively, preform and reactor. These models were used for the numerical simulation of the process of ceramic matrix composites densified by isothermal chemical vapor infiltration (ICVI). The models were used to carry out a systematic study on the influence of process conditions and the preform structure on the densification behaviors. The most important findings of our study are that the processing time could be reduced by about 50% without compromising the quality of the material, if the processing temperature is 950–1 000 °C for the first 70 hours and then raised to 1 100 °C.
Key wordsisothermal chemical vapor infiltration ceramic matrix composites process parameters fiber preform structure densification behavior
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The authors acknowledge the financial support from the National Natural Science Foundation of China (No.51472092). We also thank Northwestern Polytechnical University High Performance Computing Center for the allocation of computing time on their machines.
- Besmann TM, Sheldon BW, Lowden RA, et al. Vapor–Phase Fabrication and Properties of Continuous–Filament Ceramic Composites[J]. Science, 1991, 253: 1 104–1 109Google Scholar
- Naslain R, Langlais F, Vignoles G, et al. The CVI–Process: State of the Art and Perspective[C]. Tandon R, Wereszczak A, Lara–Curzio E (Eds.) Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, John Wiley & Sons, Inc., Hoboken, NJ, USA, 2008: 373–386Google Scholar
- Chung GY, McCoy BJ, Smith JM, et al. Chemical Vapor Infiltration: Modelling Solid Matrix Deposition for Ceramic Composites Reinforced with Layered Woven Fabrics[J]. Chem. Eng. Sci., 1992, 47 311–323Google Scholar
- Wei X, Cheng L, Zhang L, et al. Numerical Simulation of Effect of Methyltrichlorosilane Flux on Isothermal Chemical Vapor Infiltration Process of C/SiC Composites[J]. J. Am. Ceram. Soc., 2006, 89: 2 762–2 768Google Scholar
- Mason EA, Malinauskas A. Gas Transport in Porous Media: The Dusty–Gas Model[M]. Elsevier Amsterdam, 1983Google Scholar
- Bird RB, Stewart WE, Lightfoot EN. Transport Phenomena[M]. J. Wiley, 2007Google Scholar
- Zhang WG, Hüttinger KJ. CVD of SiC from Methyltrichlorosilane. Part I: Deposition Rates[J]. Chem. Vap. Deposition, 2001, 7: 167–172Google Scholar
- Vignoles GL, Descamps C, Reuge N. Interaction between A Reactive Preform and the Surrounding Gas–phase during CVI[J]. Journal de physique. IV, 2000, 10: Pr9–Pr17Google Scholar
- Brennfleck K, Fitzer E, Schoch G, et al. CVD of SiC–interlayers and Their Interaction with Carbon–Fibers and with Multilayered Nbn–Coatings [J]. J. Electrochem. Soc., NJ 08534, 1984: C94–C94Google Scholar
- Zhang WG, Hüttinger KJ. CVD of SiC from Methyltrichlorosilane. Part II: Composition of the Gas Phase and the Deposit[J]. Chemical Vapor Deposition, 2001, 7: 173–181Google Scholar