Investigation of mechanical characteristics of materials based on refractory borides
| Autor: | Tetiana Prikhna, Anastasiia Lokatkina, Viktor Moshchil, Pavlo Barvitskyi, Oleksandr Borimsky, Semyon Ponomaryov, Richard Haber, Tatiana Talako |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
ultra-high temperature ceramics
high quasi isostatic pressure Materials science HF5001-6182 Analytical chemistry Sintering zirconium diboride 02 engineering and technology engineering.material Hot pressing 01 natural sciences chemistry.chemical_compound hot pressing Fracture toughness Refractory 0103 physical sciences T1-995 Business Technology (General) hafnium diboride 010302 applied physics Zirconium diboride Material density 021001 nanoscience & nanotechnology Ultra-high-temperature ceramics chemistry engineering 0210 nano-technology Hafnium diboride |
| Zdroj: | Technology Audit and Production Reserves, Vol 6, Iss 1(56), Pp 40-44 (2020) |
| ISSN: | 2706-5448 2664-9969 |
| Popis: | The object of research is the effect of sintering under pressure (10MPa–4.1GPa) on the formation of the structure and properties of ZrB2, HfB2, and composites on their bases. It has been found that high pressure consolidation results in an improvement of mechanical characteristics. In particular, the hardness and fracture toughness of the materials sintered under 4.1GPa pressure are higher than those of the materials obtained under hot pressing conditions at 20–30MPa and spark-plasma sintering at 50MPa. High-pressure sintered HfB2demonstrated hardness HV(9.8N)=21.3±0.8GPa, HV(49N)=19.3±1.3GPa, and HV(98N)=19.2±0.5GPa and fracture toughness K1C(49N)=7.2MPa·m0.5and K1C(98N)=5.7MPa·m0.5. The HfB2sintered by hot pressing at 1850°C and 30MPa demonstrated hardness: HV(9.8N)=19.0GPa, HV(49N)=18.7GPa, and HV(98N)=18.1GPa, K1C(9.8N)=7.7MPa·m0.5, K1C(49N)=6.6MPa·m0.5and K1C(98N)=5.3MPa·m0.5. High pressure sintered ZrB2(a=0.3167nm, c=0.3528nm, γ=6.2g/cm3) demonstrated HV(9.8N)=17.7±0.6GPa, HV(49N)=15.4±1.2GPa, and HV(98N)=15.3±0.36GPa and K1C(9.8N)=4.3MPa·m0.5, K1C(49N)=4.2MPa·m0.5and K1C(98N)=4.0MPa·m0.5. Addition of 20wt.% of SiC to ZrB2and sintering under high pressure (4.1GPa) allowed essential increase of hardness to HV(9.8N)=24.2±0.7GPa, HV(49N)=16.7±0.5GPa, and HV(98N)=17.6±0.4GPa and fracture toughness to K1C(49N)=7.1MPa·m0.5, K1C(98N)=6.2MPa·m0.5; the material density was γ=5.03g/cm3. Additions of SiC and Si3N4to ZrB2lead to some increase in fracture toughness (up to K1C(98N)=9.2MPa·m0.5). The developed ZrB2- and HfB2-based materials and composites can be used for aerospace applications, in cutting and refractory industries, etc. |
| Databáze: | OpenAIRE |
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