Polycarbosilane based UD C/SiC composites: Effect of in-situ grown SiC nano-pins on mechanical properties
| Autor: | M. K. Misra, Raghwesh Mishra, Suresh Kumar, Ashok Ranjan, A. K. Saxena, R. K. Gupta, Samar Mondal |
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| Rok vydání: | 2015 |
| Předmět: |
In situ
Materials science Process Chemistry and Technology Composite number Molding (process) Surfaces Coatings and Films Electronic Optical and Magnetic Materials Flexural strength visual_art Nano Ultimate tensile strength Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material Pyrolysis |
| Zdroj: | Ceramics International. 41:12849-12860 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2015.06.122 |
| Popis: | Uni-directional C/SiC composites were fabricated by thermal molding of carbon fiber tows with the in-house synthesized polycarbosilane. The molding was carried out at 300 °C followed by pyrolysis at two different temperatures viz. 1400 and 1600 °C. The composite specimens were densified by repeated vacuum infiltration of the polycarbosilane at 170 °C and pyrolysis at the pre-decided temperatures to achieve density up to 1.8–1.85 g/cc. Flexural and tensile strength of the composites pyrolysed at 1600 °C were found to be 700 MPa and 275 MPa while the properties of the composites pyrolysed at 1400 °C were about 20% lower than these values. Micro-structure revealed that the in-situ growth of SiC nano-pins at 1600 °C, play an important role to enhance the mechanical properties. Growth mechanism of the SiC nano-pins has also been proposed. |
| Databáze: | OpenAIRE |
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