Self-Propagating High-Temperature Synthesis of Composite Nanopowder AlN-BN from Systems "Sodium Azide – Halides of Aluminum and Boron"

Abstract:

The composite powder of AlN-BN is of interest from the point of view of the use for sintering the AlN-BN composite ceramics. The ceramics compared with AlN ceramics would have better thermal shock resistance, less britlleness, better machinability, good heat conductivity and tribological properties. Possibility of obtaining a composite powder of AlN-BN with the application of process of self-propagating high-temperature synthesis (SHS) from powder mixtures of NaN₃ and precursors of aluminum and boron was investigated. Halide salts AlF₃, Na₃AlF₆, KBF₄ and NH₄BF₄ were used as the precursors. It was shown that these mixtures are capable of burning and obtaining agglomerated composite powders from nanosized (50-170 nm) particles.

• Periodical: Key Engineering Materials (Volume 685)
• Pages: 578-582
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.685.578
• Online since: February 2016
• Authors: Ljudmila Shiganova, George Bichurov, Irina Kerson, Vladislav Novikov, Anton Ermoshkin
• Keywords: AlN, BN, Nanopowder, Nitrides, Self-Propagating High-Temperature Synthesis, Sodium Azide

References

[1] H.O. Pierson, Handbook of Refractory Carbides & Nitrides: Properties, Characteristics, Processing and Applications, Elsevier Science, (1996).

[2] G. -J. Zhang, J. -F. Yang, M. Ando, T. Ohji, Nonoxide–boron nitride composites: in situ synthesis, microstructure and properties, J of Eur. Ceram. Soc., 22 (2002) 2551–2554.

DOI: 10.1016/s0955-2219(02)00115-2

[3] I. Kerson, L. Shiganova, Obtaining powder of nanostructured nitride composition TiN-BN by method of self-propagating high-temperature synthesis from azide systems KBF4-NaN3-Na2TiF6" and "NH4BF4-NaN3-Na2TiF6, Appl. Mech. Mater. 698 (2015) 507-512.

[4] T. Ya. Kosolapova, T.V. Andreeva, T.S. Bartnitskaya, G.G. Gnesin, Nonmetallic refractory compounds, Metallurgy, Moscow, 1985. (in Russian).