Synthesis and Compaction of Nickel Boride Ni3B by Means of Electric Spark Agglomeration
A. V. UKHINA1, D. V. DUDINA1,2, M. A. KORCHAGIN1,3, YU. G. MATEYSHINA1, N. V. BULINA1, A. G. ANISIMOV2, V. I. MALI2, I. S. BATRAEV2
1Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Ul. Kutateladze 18, Novosibirsk 630128 (Russia)
2Lavrentyev Institute of Hydrodynamics, Siberian Branch of the Russian Academy of Sciences, Pr. Lavrentyeva 15, Novosibirsk 630090 (Russia)
3Tomsk State University, Pr. Lenina 36, Tomsk 634050 (Russia)
Keywords: бориды никеля, тепловой взрыв, электроискровое спекание, удельное электрическое сопротивление, микротвердость, nickel borides, thermal explosion, electric spark agglomeration, specific electric conductance, microhardness
Abstract
Nickel boride Ni3B is a promising material for making self-regulated heating elements. In the present work, the synthesis of nickel boride Ni3B and its compaction were carried out for the first time by means of electric spark agglomeration. Two approaches were considered for obtaining sintered materials based on Ni3B: 1) reactive electric spark agglomeration of the mixture of 3Ni + B subjected to preliminary mechanical treatment; 2) obtaining Ni3B by means of thermal explosion in mechanically treated powder mixture, followed by compaction of the resulting product with the help of electric spark agglomeration. It was established that the material based on Ni3B, obtained by reactive agglomeration, is characterized by lower content of admixture phase Ni2B and higher relative density and microhardness in comparison with the material obtained by sintering the product of thermal explosion at the same temperature. Specific electric conductance of agglomerated materials based on Ni3B is about 10-3 Ohm x cm.
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