ORALS
SESSION:
AdvancedMaterialsMonAM-R10
| 6th Intl. Symp. on New & Advanced Materials & Technologies for Energy, Environment, Health & Sustainable Development |
| Mon. 28 Nov. 2022 / Room: Saitong | |
| Session Chairs: Fernand Marquis; Session Monitor: TBA |
12:45: [AdvancedMaterialsMonAM04] OS
Structure and mechanical characteristics of high pressure sintered ZrB2, HfB2 and ZrB2- TiB2, ZrB2-SiC composite materials. Tetiana
Prikhna1 ; Anastasia
Lokatkina
2 ; Viktor
Moshchil
3 ; Pavlo
Barvitskiy
3 ; Olexandr
Borymskyi
4 ; Florian
Kongoli
5 ; Fernand
Marquis
6 ;
1V. Bakul Institute NASU, Kiev, Ukraine;
2Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kyiv, Ukraine;
3Institute for Superhard Materials, Kiev, Ukraine;
4V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kyiv, Ukraine;
5FLOGEN Technologies, Mont-Royal, Canada;
6San Diego State University, San Diego, United States;
Paper Id: 286
[Abstract] The ZrB<sub>2</sub> and HfB<sub>2</sub> materials are promising for application in hypersonic aerospace, cutting tools, metallurgy, microelectronics and refractory industries. The structure and properties of sintered under high pressure (4GPa) - high temperature (1800 <sup>o</sup>C) or HP-HT conditions ZrB<sub>2</sub>, HfB<sub>2</sub>, ZrB<sub>2</sub>+30%TiB<sub>2</sub> and ZrB<sub>2</sub>-20% SiC refractory materials are under consideration. HP-HT sintered HfB<sub>2</sub> (a=0.3141, c=0.3473 nm γ=10.42 g/cm<sup>3</sup>) demonstrated hardness HV(9.8 N)=21.27±0.84 GPa, HV(49 N)=19.29±1.34 GPa, and HV(98 N)=19.17±0.5 GPa and fracture toughness K1C(9.8 N)=6.47 MN×m0.5. High pressure sintered ZrB<sub>2</sub> (a=0.3167 , c=0.3528 nm, γ=6.1 g/cm<sup>3</sup>) demonstrated HV(9.8N)= 17.66±0.60 GPa, HV(49 N)= 15.25±1.22 GPa, and HV(98 N)= 15.32±0.36 GPa and K1C(9.8 N)=3.64 MN×m0.5. Addition of 30 wt.% of TiB<sub>2</sub> to ZrB<sub>2</sub> did not allow to increase hardness of the material essentially (HV(9.8 N)=17.75±2.36 GPa, γ=5.29 g/cm<sup>3</sup> ). Addition of 20 wt.% of SiC to ZrB<sub>2</sub> and sintering under high pressure allowed essential increase of hardness to HV(9.8 N)=24.18±0.7 GPa, HV(49 N)=16.68±0.5 GPa, and HV(98 N)=17.59±0.4 GPa and fracture toughness (K1C(9.8 N)=6.49 ± 0.25 MN×m<sup>0.5</sup>, K1C(49 N)=7.06± 1.55 MN×m<sup>0.5</sup> , K1C(98 N)=6.18± 1.24 MN×m<sup>0.5</sup>) of composite ZrB<sub>2</sub>- SiC material (γ=5.03 g/cm<sup>3</sup>).
13:10 LUNCH
