Sintering behaviour, solid solution formation and characterisation of TaC, HfC and TaC–HfC fabricated by spark plasma sintering
| Autor: | Michael J. Reece, Salvatore Grasso, William E. Lee, Nasrin Al Nasiri, Omar Cedillos-Barraza, Doni Daniel Jayaseelan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Sintering Spark plasma sintering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Thermal expansion Lattice constant Fracture toughness visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology High-resolution transmission electron microscopy Solid solution |
| Zdroj: | Journal of the European Ceramic Society. 36:1539-1548 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2016.02.009 |
| Popis: | Solid solution formation and sintering behaviour of TaC–HfC ceramics made from commercial TaC and HfC powders prepared using spark plasma sintering (SPS) at temperatures up to 2450 °C was investigated. Phase analysis and lattice parameter measurements using X-ray Diffraction (XRD) showed mutual diffusion of Hf and Ta with increasing sintering temperature. High Resolution Transmission Electron Microscopy (HRTEM) confirmed that solid solution formation and densification were achieved by a solid-state mechanism. Solid solutions were achieved for 4TaC–1HfC, 1TaC–1HfC and 1TaC–4HfC powders after sintering at temperatures of at least 2350 °C. Fracture toughness ( K IC ) values were in the range of 2.7–3.4 MPa m 1/2 for all ceramics measured using Vickers indentation. Thermal conductivity of TaC was 55.8 W/m K at 1400 °C. Coefficients of thermal expansion (CTE) varied from 7.08–7.66 × 10 −6 /K (in the range of 25–2000 °C), with TaC at the lower end. |
| Databáze: | OpenAIRE |
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