The creation of ceramic-matrix composites of the BL group based on cBN and hightemperature hafnium or molybdenum carbides

TitleThe creation of ceramic-matrix composites of the BL group based on cBN and hightemperature hafnium or molybdenum carbides
Publication TypeJournal Article
Year of Publication2020
AuthorsStratiichuk, DA, Turkevich, VZ, Slipchenko, KV, Bushlya, VM
Abbreviated Key TitleDopov. Nac. akad. nauk Ukr.
SectionMaterials Science
Date Published9/2020

Using the HPHT technology in the temperature interval 1600-2400 °C, the processes of formation of superhard ceramic-matrix composites in the cBN-HfC-(Al) and cBN-Мо2C-(Al) systems have been investigated. With the original ratio of components cBN:carbide:(Al) being 60:35:5 vol. %, using micropowders with a grain size of 1-10 μm, it has been shown that, starting from TSINT = 1600 °C and higher, there is a consolidation of structural constituents in the systems with the formation of strong interphase and interparticle contacts such as cBN-cBN, cBN-carbide, and carbide-carbide. The grain structure in the entire sintering temperature range does not undergo significant changes and remains fine-grained with clear interphase boundaries. The cBN— HfC—(Al) system is characterized by the formation of the boride phase — HfB2, whereas the formation of monocarbide — MoC has been observed for the cBN-Мо2C-(Al) system. Aluminum, which is present in these systems in small quantities (5 vol. %), plays the role of a residual oxygen getter and simultaneously lowers the activation barrier, making the sintering process partially liquid-phase. Young’s modulus, as well as the hardness, shows a typical dependence on TSINT maximum at 1800—2000 °C. Laboratory tests in turning AISI 316L stainless steel (cutting speed vc = 300 m/min, feed f = 0.15 mm/rev, cutting depth ap = 0.5 mm, time 300 seconds) have demonstrated the cutting edge wear for two types of composites in the range of 60—90 mkm, which indicates that this type of materials is promising as a metalworking tool.

KeywordscBN, cutting ceramics, hafnium carbide, high pressures, molybdenum carbide, superhard materials

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