Studies on the thermal stability of nanosized powder of WC1-x-based product prepared by plasma dynamic method, compaction feasibility of the powder and preparation of composite with aluminium
| Autor: | D. S. Nikitin, Denys S. Butenko, Yuliya Shanenkova, Alexander Ivashutenko, Yuliya Vympina, Wei Han, Alexander Sivkov, Ivan Shanenkov |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Sintering chemistry.chemical_element 02 engineering and technology 01 natural sciences chemistry.chemical_compound Tungsten carbide 0103 physical sciences Materials Chemistry Thermal stability Graphite Ceramic Thermal analysis 010302 applied physics Process Chemistry and Technology 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous carbon Chemical engineering chemistry visual_art Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology Carbon |
| Zdroj: | Ceramics International. 47:6884-6895 |
| ISSN: | 0272-8842 |
| Popis: | Obtaining ceramics and composites based on cubic tungsten carbide WC1-x requires knowledge of its thermal behavior, which is poorly studied now. The paper presents the results of a thermal analysis of the nanosized WC1-x-based product with the stoichiometry of WC0.72-0.74 synthesized by a plasma dynamic method. Taking into account the known literature data on the structure of WC1-x products, an investigation of synthesized nanoparticles allows us to conclude that WC1-x cannot exist without a crystalline graphite shell and/or an amorphous carbon matrix. Similarly, the destruction of both carbon shells and a matrix leads to either quick oxidation of WC1-x to WO3 when heated in air or the phase transition WC1-x → WC when heated in vacuum. The thermal analysis shows WC1-x is stable up to 550 °C in air and up to 1200 °C in vacuum and argon. The obtained data made it possible to formulate recommendations for preserving WC1-x material in bulk specimens when compacting from the dispersed powder. The preparation of binderless ceramics from the WC1-x-based product by the SPS method seems to be impossible due to carbon diffusion during the sintering process, while the use of WC1-x-based products as a reinforcing additive to a metal (Al) matrix seems to be the only way to preserve this crystalline phase in a bulk form at the present time. |
| Databáze: | OpenAIRE |
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