COMPOSITION, STRUCTURE, PROPERTIES (MECHANICAL, OXIDATION RESISTANCE, ELECTRICAL RESISTANCE) AND PERFORMANCE OF WHISKER-REINFORCED CBN-BASED MATERIALS WITH NBN BINDER

Yuliia Rumiantseva; Denys Savchenko; Ludmila Romanko; Oleksandr Shcheretsky; Yuriy Melnichuk; Volodymyr Bushlya; Oleg Zapotozhets; Volodymyr Turkevych; Dmytro Turkevych; Igor Fesenko

Yuliia Rumiantseva V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine
Denys Savchenko V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine
Ludmila Romanko V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine
Oleksandr Shcheretsky Physical-technological Institute of Metals and Alloys of the National Academy of Science of Ukraine
Yuriy Melnichuk V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine
Volodymyr Bushlya Lunds Universitet http://orcid.org/0000-0002-6955-4613
Oleg Zapotozhets G.V. Kurdyumov Institute for Metal Physics of National Academy of Sciences of Ukraine
Volodymyr Turkevych V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine http://orcid.org/0000-0002-1441-4269
Dmytro Turkevych V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine
Igor Fesenko V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine

Keywords: cBN, whiskers, oxidation, electrical resistivity, wear, mechanical properties

Abstract

Three types of cBN-based composites (without whiskers, reinforced with Si₃N₄whiskers (Si₃N₄w) and reinforced with SiC whiskers (SiCw)) obtained by High Pressure-High Temperature (HPHT) sintering. Density, Young’s modulus, Bulk modulus, Poisson ratio, hardness and fracture toughness, oxidative resistance and electrical resistivity have been measured. Whisker-reinforcement by the help of all above-mentioned whisker’s types (SiCw, Si₃N₄w) was lead to the improvement of mechanical properties (hardness, fracture toughness), oxidative resistance and electrical conductivity. Despite on this only SiCw-reinforcement was effective wear resistance improvement due to the higher chemical resistance of SiCw compared to Si₃N₄w.