Is spark plasma sintering suitable for the densification of continuous carbon fibre - UHTCMCs? |
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| Affiliation: | 1. CNR-ISTEC, Institute of Science and Technology for Ceramics, Via Granarolo 64, I-48018 Faenza, Italy;2. Nanoker Research S.L., Polígono de Olloniego, Parcela 22A - Nave 5, 33660 Oviedo, Principado de Asturias, Spain;1. Department of Inorganic Nonmetallic Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Tianjin College, University of Science and Technology Beijing, Tianjin 301830, China;1. School of Materials, Sun Yat-sen University, Guangzhou, 510275, China;2. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, 100083, China;3. The Key Laboratory of Fluid and Matter Interaction, University of Science and Technology Beijing, Beijing, 100083, China;4. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China;5. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150001, China |
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| Abstract: | For the first time we show that spark plasma sintering can efficiently replace hot pressing for the densification of UHTCMCs, in the present case ZrB2/SiC composites reinforced with continuous carbon fibres. To this purpose, the same materials were first produced by hot pressing as baseline samples and then by spark plasma sintering (SPS) to compare microstructure and basic mechanical properties. A special emphasis was given to the study of interfaces, in case of both coated and uncoated carbon fibres.SPS allowed for faster sintering but required an adjustment of the temperature to avoid fibre degradation compared to hot pressing. With similar porosity levels, we observed a slight decrease of flexural strength (300 vs 470 MPa), and an improvement of fracture toughness (15 vs 10 MPa√m) for SPSed samples. SPS was proved to be an effective method for the consolidation of continuous fibre reinforced UHTC composites. |
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| Keywords: | Spark plasma sintering Ceramic matrix composite UHTCMC Carbon fibre Hot pressing |
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