2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 6. New and Advanced Materials and Technologies

Editors:F. Kongoli, F. Marquis, P. Chen, T. Prikhna, N. Chikhradze
Publisher:Flogen Star OUTREACH
Publication Year:2018
Pages:392 pages
ISBN:978-1-987820-92-8
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    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;
    Type of Paper: Invited
    Id Paper: 119
    Topic: 43

    Abstract:

    The results of a structural and mechanical properties study of aluminum dodecaboride (a-AlB<sub>12</sub>, AlB<sub>12</sub>C<sub>2</sub>, a-AlB<sub>12</sub>-TiB<sub>2</sub>-TiC)- and boron carbide (B<sub>4</sub>C and B<sub>4</sub>C-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-AlB<sub>12</sub>, AlB<sub>12</sub>C<sub>2</sub>, C nanopowders and B<sub>4</sub>C, SiC, TiC micropowders. The preliminary mixtures of powders were prepared using high speed planetary activator. The a-AlB<sub>12</sub> 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 AlB<sub>12</sub>C<sub>2</sub> nanopowder sintered at 1400°C, 2 GPa, 1 h contained 89 wt.% AlB<sub>12</sub>C<sub>2</sub> and 11 wt.% of admixture Al<sub>2</sub>O<sub>3</sub> (according x-ray diffraction study) and demonstrated hardness HV(49 N-load)=26.6-0.6 GPa, fracture toughness K<sub>1<i>c</i></sub> (49 N)=5.9-0.5 MPa-m0.5, density g=2.73 g/сm<sup>3</sup>. The materials obtained at 30 MPa, 2240-1950°C had much higher characteristics. γ-AlB<sub>12</sub> (94-98 wt.%, p=2.53-2.58 g/cm<sup>3</sup>) showed HV(49 N)=24.1 GPa; K<sub>1<i>c</i></sub> (49 N)=4.9 MPa-m0.5; bending R<sub>bs</sub>=336 MPa and compressive R<sub>cs</sub>=378 MPa strengths. Composite 74 wt.% AlB<sub>12</sub>C<sub>2</sub>, 22 wt% TiB<sub>2</sub> , 4 wt% Al<sub>2</sub>O<sub>3</sub> (p=3.1 g/сm3) had HV(49N)=37.65-6.74 GPa, K<sub>1<i>c</i></sub>(49 N)=5.2 MPa-m0.5, R<sub>bs</sub> = 646 MPa and R<sub>cs</sub> =795 MPa. B4C(p=2.52 g/сm3<sup></sup>) demonstrated HV(4.9 N)=40 GPa, K<sub>1<i>c</i></sub> (3-point bending)=4.89 MPa-m0,5, R<sub>cs</sub>=392 MPa, R<sub>cs</sub>=1551 MPa and B<sub>4</sub>C-20%SiC (p = 2.67 g/cm<sup>3</sup>) had HV(49 N)= 35 GPa, K<sub>1<i>c</i></sub>(3-point bending)=5.9 MPa-m0,5, R<sub>bs</sub>=474 MPa, R<sub>cs</sub>=1878 MPa.

    Keywords:

    New and advanced materials;

    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.

    Cite this article as:

    Prikhna T, Barvitskiy P, Moshchil V, Domnich V, Marquis F, Karpets M, Dub S, Ponomarov S, Haber R. (2018). Hot Pressed Aluminum Dodecaboride- and Boron Carbide-based Ceramics. In F. Kongoli, F. Marquis, P. Chen, T. Prikhna, N. Chikhradze (Eds.), Sustainable Industrial Processing Summit SIPS2018 Volume 6. New and Advanced Materials and Technologies (pp. 225-226). Montreal, Canada: FLOGEN Star Outreach