Dispersion behaviour of laser-synthesized silicon carbide nanopowders in ethanol for electrophoretic infiltration |
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| Authors: | A Coupé H Maskrot E Buet A Renault PJ Fontaine L Chaffron |
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| Affiliation: | 1. CEA, DEN, SRMA, LTMEx, 91191 Gif-sur-Yvette, France;2. Institut de Sciences des Matériaux de Mulhouse, CNRS, LRC 7228, 15 rue Jean Starcky, 68057 Mulhouse, France;3. CEA, DEN, SRMA, LA2M, 91191 Gif-sur-Yvette, France;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Taiyuan 030001, PR China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100039, PR China;3. Taiyuan University of Science and Technology, Taiyuan 030024, PR China;1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, PR China;2. Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710054, PR China;3. C/C Composites Technology Research Centre, Northwestern Polytechnical University, Xi’an 710072, PR China;1. State Key Laboratory of Solidification Processing, C/C Composites Research Centre, Northwestern Polytechnical University, Xi''an 710072, PR China;2. Shanghai Aerospace Equipment Manufacture, Shanghai 200245, PR China |
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| Abstract: | SiC nanopowders of 30 nm in diameter were successfully synthesized by laser-pyrolysis with high production rate (1.7 kg/h) and high quantity (>2 kg). The as-synthesized nanopowders were heat-treated in order to slightly oxidize the surface. It was shown that the heat-treatment does not modify structural properties or morphology but modifies the surface chemistry. Ethanolic suspensions with polyethylenimine (PEI) as dispersant were prepared from the heat-treated powders. The suspensions properties were characterized in terms of rheology, zeta potential and size distribution before and after operational pH adjustment with hydrochloric acid (HCl 1 M) or acetic acid (CH3COOH). High concentrated suspensions (28 wt%) with low viscosity were obtained after pH adjustment with CH3COOH. Electrophoretic infiltrations of carbon preforms carried out with these suspensions lead to a high quality infiltration of the inter-tows area as well as of the intra-tows area, some tows being completely filled with the nanopowders. |
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