Analysis possibility of synthesis nitride TiN-BN, AlN-BN and Si3N4-TiN on the technology SHS azide

In this paper presents the optimal system for the synthesis mode azide SHS technology nitride submicrocrystalline and nano- products (TiN-BN, AlN-BN and Si3N4-TiN) systems of, consisting of sodium azide, chemical element and/or halide salts. The paper is based chemical compositions phasic formation of nitrides TiN-BN, AlN-BN and Si3N4-TiN the synthesis of optimal systems. The pure nitrides composition TiN-BN, Si3N4-TiN no side products could be obtained from the systems of «3Al+NH4BF4+4NaN3» and «3Si+(NH4)2TiF6+6NaN3» with the following ratio of the product phases: TiN (88 %), ВN (12 %) and TiN (28 %), α-Si3N4 (11 %), β-Si3N4 (61 %) respectively. The pure nitride composition AlN-BN without byproduct Na3AlF6 (9%) could not synthesize. As a result, research has been set the size and shape of the particles synthesized nitride of powdered product: AlN - plates size of 100-150 nm (thickness), BN and Na3AlF6 - equiaxed particle size of 300-400 nm, TiN fiber size of 70-90 nm in diameter and BN - equiaxed particle size of 150-200 nm, α-Si3N4 - fiber size of 150-200 nm in diameter, β-Si3N4 - bars size of 200-300 nm in diameter and TiN - equiaxed particle size of 100-120 nm.