SIPS 2018

DETAILLED PROGRAM OVERVIEW

Hot Pressed Aluminum Dodecaboride- and Boron Carbide-based Ceramics
Tetiana Prikhna¹; Pavlo Barvitskiy¹; Viktor Moshchil¹; Vladislav Domnich²; Fernand Marquis³; Myroslav Karpets¹; Sergey Dub¹; Semyon Ponomarov⁴; Richard Haber²;
¹INSTITUTE FOR SUPERHARD MATERIALS, Kiev, Ukraine; ²RUTGERS UNIVERSITY, New Brunswick, United States; ³SAN DIEGO STATE UNIVERSITY, San Diego, United States; ⁴INSTITUTE OF SEMICONDUCTOR PHYSICS, Kiev, Ukraine;
PAPER: 119/AdvancedMaterials/Invited (Oral)
SCHEDULED: 14:50/Wed./Guaratiba (60/2nd)

ABSTRACT:
The results of a structural and mechanical properties study of aluminum dodecaboride (a-AlB12, AlB12C2, a-AlB12-TiB2-TiC)- and boron carbide (B4C and B4C-SiC)-based ceramics, hot pressed at 30 MPa, 1950 - 2240°C, and high pressure (2 GPa) as well as high temperature (1200-1400°C) sintered and synthesized, will be under discussion. The materials can be used as protective armor or constructional ceramics for nuclear power plants, additives to the boron-carbide-based materials, or as solid fuel, abrasives, explosives, etc. [1-5]. The materials were manufactured from a-AlB12, AlB12C2, C nanopowders and B4C, SiC, TiC micropowders. The preliminary mixtures of powders were prepared using high speed planetary activator. The a-AlB12 powder with and without carbon additions can be sintered to the dense state of 1200-1400°C, 2 GPa, 1 h, while the hardness of the materials was not high (12.5-17.8 GPa at 49 N-load). The AlB12C2 nanopowder sintered at 1400°C, 2 GPa, 1 h contained 89 wt.% AlB12C2 and 11 wt.% of admixture Al2O3 (according x-ray diffraction study) and demonstrated hardness HV(49 N-load)=26.6-0.6 GPa, fracture toughness K1c (49 N)=5.9-0.5 MPa-m0.5, density g=2.73 g/сm3. The materials obtained at 30 MPa, 2240-1950°C had much higher characteristics. γ-AlB12 (94-98 wt.%, p=2.53-2.58 g/cm3) showed HV(49 N)=24.1 GPa; K1c (49 N)=4.9 MPa-m0.5; bending Rbs=336 MPa and compressive Rcs=378 MPa strengths. Composite 74 wt.% AlB12C2, 22 wt% TiB2 , 4 wt% Al2O3 (p=3.1 g/сm3) had HV(49N)=37.65-6.74 GPa, K1c(49 N)=5.2 MPa-m0.5, Rbs = 646 MPa and Rcs =795 MPa. B4C(p=2.52 g/сm3) demonstrated HV(4.9 N)=40 GPa, K1c (3-point bending)=4.89 MPa-m0,5, Rcs=392 MPa, Rcs=1551 MPa and B4C-20%SiC (p = 2.67 g/cm3) had HV(49 N)= 35 GPa, K1c(3-point bending)=5.9 MPa-m0,5, Rbs=474 MPa, Rcs=1878 MPa.

References:
[1] Kisly, P. S., Neronov, V.A., Prikhna, T. A., Bevza, Yu.B. (1990). Aluminum borides, Kiev, Naukova Dumka, 1-192. (in Russian) (Кислый П. С., Неронов В. А., Прихна Т. А., Бевза Ю. В. Бориды алюминия. К.: Наук. Думка, 1990. 192 с).
[2] Whittaker, M. L., (2012) Synthesis, characterization and energetic performance of metal boride compounds for insensitive energetic materials, Thesis for the degree of Master of Science : - The faculty of the University of Utah Department of Materials Science and Engineering, University of Utah.
[3] Domnich, V., Reynaud, S., Haber, R.A., Chowalla, MJ. Am. Ceram. Soc., 94 (2011) 3605-3628.
[4] Prikhna, Т. A., Barvitskiy P. P., Karpets М. В., Muratov V. B., Sverdun V. B., Haber R., Kartuzov V. V., Moshchil V. E., Dub S. N., Loshak M. G., Alexandrova L. I., Kovylaev V. V., Garbuz V.V., Marchenko A. A., J. Superhard Materials, 39(5) (2017) 299-307.
[5] Prikhna, Т.А., Haber, R. A., Barvitskiy, P. P., Sverdun,V. B., Dub, S. N., Muratov, V. B., Domnich , V., Karpets, М. V., Moshchil, V. E., Loshak, М. G., Kovylaev, V.V., Vasiliev O.O., Proceedings of the 41st International conference and exposition on advanced ceramics and composites, January 22 - 27, 2017, Daytona Beach, Fla., USA., http://acumen-va-publish.com/ACerS/ICACC_2017/toc.html.