Properties of Cf/SiC-ZrB2-TaxCy composite produced by reactive hot pressing and polymer impregnation pyrolysis (RHP/PIP)
| Autor: | Lingappa Rangaraj, Rajaguru Kannan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Materials science Composite number Oxide Sintering 02 engineering and technology Penetration (firestop) Polymer 021001 nanoscience & nanotechnology Hot pressing 01 natural sciences chemistry.chemical_compound Flexural strength chemistry 0103 physical sciences Materials Chemistry Ceramics and Composites Composite material 0210 nano-technology Pyrolysis |
| Zdroj: | Journal of the European Ceramic Society. 39:2257-2265 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2019.02.025 |
| Popis: | Cf/SiC-ZrB2-TaxCy composite was synthesized by reactive hot pressing (RHP) of Cf cloth, polycarbosilane (PCS), ZrB2, and Ta powders at 4 MPa and 1200 °C. PIP cycle influenced sintering process by increasing density of the composite from 2.34 to 2.82 g/cc. Residual carbon produced during the PIP cycles at 1200 °C was utilized to yield TaxCy by the addition of Ta. SEM images illustrate that by increasing the number of PIP cycles, SiC derived from the PCS cover the Cf fibre, micropores, and cracks. PIP cycles and TaxCy phase improved flexural strength of the composite from 20 to 114 MPa. Mass and linear ablation resistance studies at 1600–2000 °C exhibited that oxide formation at the outer surface caused a barrier; further, no oxidation underneath the composite was observed. SEM images display that at 2000 °C, SiO2 and TaxOy were molten and sealed the pores. Hence, ablation resistance was enhanced by blocking the penetration in high-temperature flame. |
| Databáze: | OpenAIRE |
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