Processing and characterization of Cf/ZrB2-SiC-ZrC composites produced at moderate pressure and temperature
| Autor: | Rajaguru Kannan, Lingappa Rangaraj |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Composite number 02 engineering and technology 021001 nanoscience & nanotechnology Hot pressing 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Metal Magazine Flexural strength law Elemental analysis visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Grain boundary Composite material 0210 nano-technology Layer (electronics) |
| Zdroj: | Ceramics International. 43:2625-2631 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2016.11.073 |
| Popis: | Cf/ZrB2-SiC/ZrC composites were prepared by hot pressing of carbon fibre (Cf) cloth, ZrB2, polycarbosilane (PCS) and Zr metal at 4 MPa and 1200 °C. The bulk density of Cf/ZrB2-SiC/ZrC composite was improved from 2.29 g/cc to 2.69 g/cc as a function of PCS infiltration cycles. Microstructural investigation revealed that the SiC encapsulates the Cf and also present at grain boundaries. This resulted in enhanced scratch critical load from 1500 to 3200 mN and flexural strength from 30 to 100 MPa. Further, oxyacetylene flame at 2100 °C for a shorter duration of 20–60 s showed a decrease in the mass ablation rate from 0.0062 to 0.0028 g/s. This was due to the formation of protective Zr-Si-O layer and confirmed by elemental analysis. |
| Databáze: | OpenAIRE |
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