Extraction of compact ceramic electrode materials based on the Ti‒B‒Fe system modified by nanosized AlN particles by SHS extrusion

Abstract

Compact ceramic electrode materials based on the Ti‒B‒Fe system modified with nanosized particles of aluminum nitride (up to 15 wt. %) were obtained by SHS extrusion. The effect of additives on the combustion characteristics of the studied system, as well as on the structure and phase composition of the obtained materials, is studied. The addition of aluminum nitride increases the content of boride and nitride phases in the final product. It was found that the introduction of modifying nanosized particles of aluminum nitride into the initial charge leads to the grinding of grains of boride and nitride phases, which together increases the microhardness by 10 %, in comparison with unmodified samples.

Coatings Prepared by Electro-Spark Alloying with SHS Electrode Materials Based on Ti-B-Fe-AlN

“…The decrease in the grain size of titanium diboride is explained by the fact that, when a nanomodifier in the form of dispersed AlN particles is added, the combustion temperature decreases because the heat released during the chemical reaction of titanium with boron is partially spent on the decomposition of AlN and is spent on further low-exothermic (taking into account the small fraction of nanoparticle additives) or endothermic reactions with the initial components and synthesis products. These factors limit the growth of titanium diboride grains [52,53]. The properties of the SHS electrode materials used in this work are reported in Table 1 and show that, with an increase in the number of AlN particles in the electrode material, its hardness increases and the electrical resistance decreases.…”

“…titanium diboride grains [52,53]. The properties of the SHS electrode materials used in thi work are reported in Table 1 and show that, with an increase in the number of AlN parti cles in the electrode material, its hardness increases and the electrical resistance decreases The decrease in electrical resistance in the electrode material leads to an improvement in its erosive ability when applying a protective coating.…”