Abstract
Using very fine (<2 µm) AlB2, α-AlB12, Al3B48C2 and Al8B4C7 powders synthesized from simple substances a study is made of the oxidation of aluminum borides and borocarbides in air and liquid reagents. Their microhardness and electrical conductivity are measured using hot-pressed specimens. In order of decreasing reducibility the boron-containing aluminum phases are placed as follows: AlB2-Al8B4C7-B-AlB12-Al3B48C2. In AlB12 and Al3B48C2 specimens after high-temperature annealing their electrical conductivity increases and the effect of Mott conductivity is revealed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
O. A. Golikova, V. M. Orlov, T. Kh. Khomidov, et al., “Preparation of AlB12 single crystals,” Izv. Akad. Nauk SSSR, Neorg. Materialy,13, No. 6, 27–29 (1977).
M. N. Korsukova, V. E. Popov, and V. N. Gurin, “Preparation of aluminum dodecaboride single crystals—a promising high-hardness material,” Sverkhtverdye Materialy, No. 6, 7–8 (1980).
Z. Inoue, H. Tanaka, and Y. Inomata, “Synthesis and x-ray crystallography of aluminum boroncarbide Al8B4C7,” J. Mat. Sci., No. 12, 3036–3040 (1980).
P. S. Kisly, T. A. Prihna, and P. S. Globyak, “Properties of high-temperature solution growth of aluminum boride,” Less-Common Met.,117, No. 3, 349–355 (1986).
I. Higashi, T. Sakurai, and T. Atoda, “Crystal structure of α-AlB12,” J. Solid Stat. Chem.,20, No. 1, 67–77 (1977).
V. R. Nechina (ed.), Analysis of Boron, Its Componds, and Pressings [in Russian], Atomizdat, Moscow (1978).
V. A. Dubok, “Improvement of the chemical analysis method for refractory compounds and metal alloys,” Preprint, Institute of Materials Science Problems, Ukrainian Academy of Sciences, Kiev (1988).
V. I. Tikhonov, Analytical Chemistry of Aluminum [in Russian], Nauka, Moscow (1971).
A. I. Kharlamov and V. G. Aleshin, “Surface state of d-metal compounds with nitrogen, boron, and silicon,” Izv. Akad. Nauk SSSR, Neorgan. Materialy,16, No. 3, 446–449 (1980).
T. I. Serebryakova, V. N. Neronov, and P. D. Peshev, High-Temperature Borides [in Russian], Metallurgiya, Moscow (1991).
A. I. Kharlamov, L. M. Murzin, S. V. Loichenko, and E. I. Kovalevskaya, “Study of the electrical conductivity and thermal-emf coefficient for hot-pressed specimens of aluminum borides and borocarbides,” in: Borides, Collected Works, Institute of Materials Science Problems, Ukrainian Academy of Sciences, Kiev (1990), pp. 107–113.
O. A. Golikova, “Semiconductors with a complex lattice and the amorphization problem,” Phys. Sta. Sol.,101, No. 2, 277–314 (1987).
M. M. Kazanin, “Electrical properties and conductivity mechanism for β-rhombohedral boron and AlB12,” Author's Abstr. Diss. Cand. Phys.-Mat. Sci., Leningrad (1987).
É. N. Tkalenko, “Electrical properties, reflection spectrum, and conductivity mechanism for aluminum dodecaboride (α-AlB12),” Fiz. Tverdogo Tela,15, No. 3, 952–955 (1973).
I. S. Kasper, M. Vlasse, and H. S. Nalain, “The α-AlB12 structure,” J. Sol. State. Chem.,20, No. 3, 281–285 (1977).
O. A. Golikova, and S. Samatov, “Conduction mechanism of some “Quasi-Amorphous” semiconductors on the basis of boron,” Phys. Stat. Sol.,A77, No. 2, 449–453 (1983).
Additional information
Institute of Materials Science, Ukrainian Academy of Sciences, Kiev. Kiev National University. Translated from Poroshkovaya Metallurgiya, Nos. 5/6, pp. 5–16, May–June, 1995.
Rights and permissions
About this article
Cite this article
Kharlamov, A.I., Kirillova, N.V. & Zaitseva, Z.A. Properties of very fine aluminum boride and borocarbide powders and also hot-pressed materials based on them. Powder Metall Met Ceram 34, 229–238 (1995). https://doi.org/10.1007/BF00560121
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00560121