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

Stratiichuk, DA
Turkevich, VZ
Slipchenko, KV
Bushlya, VM
Dopov. Nac. akad. nauk Ukr. 2020, 9:38-46
https://doi.org/10.15407/dopovidi2020.09.038
Section: Materials Science
Language: Ukrainian
Abstract: 

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.

Keywords: cBN, cutting ceramics, hafnium carbide, high pressures, molybdenum carbide, superhard materials
References: 

1. Ning, Li, Yong-Jie, Chen, Dong-Dong, Kong. (2018). Wear Mechanism Analysis and Its Effects on the Cutting Performance of PCBN Inserts during Turning of Hardened 42CrMo. Int. J. Precision Engineering and Manufacturing. 19, No. 9, P. 1355-1368. https://doi.org/10.1007/s12541-016-0160-6
2. Davoudinejad, A. & Noordin, M. Y. (2014). Effect of cutting edge preparation on tool performance in hardturning of DF-3 tool steel with ceramic tools. J. Mech. Sci. and Technol., 28, No. 11, pp. 4727-4736. https://doi.org/10.1007/s12206-014-1039-9
3. Aslan, E., Camuşcu, N., & Birgören, B. (2007). Design optimization of cutting parameters when turning hardened AISI 4140 steel (63HRC) with Al2O3+TiCN mixed ceramic tool. Materials & Design, 28, No. 5, pp. 1618-1622. https://doi.org/10.1016/j.matdes.2006.02.006
4. Liyao, Gu. (2018). Critical condition prediction of adiabatic shear fracture in high-speed cutting TA2 alloy. Int J Adv Manuf Technol, 94, pp. 2981-2991. https://doi.org/10.1007/s00170-017-1104-5
5. Willey, Liew, Ngoi, B.K.A. & Lu, Y. G. (2003). Wear characteristics of PCBN tools in the ultra-precision machining of stainless steel at low speeds. Wear, 254, No. 3-4, pp. 265-277. https://doi.org/10.1016/S0043-1648(03)00002-4
6. Bushlya, V. et al. (2019). On chemical and diffusional interactions between PCBN and superalloy Inconel 718: Imitational experiments. J. Eur. Ceram. Soc., 39, No. 8, pp. 2658-2665. https://doi.org/10.1016/j.jeurceramsoc.2019.03.002
7. Bushlya, V., Gutnichenko, O., Zhou, J., Avdovic, P. at al. (2013). Effects of cutting speed when turning age hardened inconel 718 with PCBN tools of binderless and low-CBN grades. Mach. Sci. Technol., 17, No. 4, pp. 497-523. https://doi.org/10.3103/S1063457617030078
8. Chiou, S. Y., Ou, S. F., Jang, Y. G. & Ou, K. L. (2013). Research on CBN/TiC composites Part1: Effects of the cBN content and sintering process on the hardness and transverse rupture strength. Ceram. Int., No. 1. https://doi.org/10.1016/j.ceramint.2013.02.066
9. Benko, E., Barr, T. L., Hardcastle, S., Hoppe, E., Bernasik, A. & Morgiel, J. (2001). XPS study of the cBN-TiC system. Ceram. Int., 27, No. 6, pp. 637-643. https://doi.org/10.1016/S0272-8842(01)00011-6
10. Slipchenko K.V., Turkevich V.Z., Slipchenko V.M., Bilyavina N.M. (2019). The influence of sintering temperature on phase composition and mechanical properties of сbn-based composites with addition of vanadium com pounds. Metallofizika i Noveishie Tekhnologii, 41, No. 12. P. 1599—1610.
11. Slipchenko, K., Petrusha, I., Turkevich, V., Bushlya, V. & Ståhl, J.-E. (2018). Investigation of the mechanical properties and cutting performance of cBN based cutting tools with Cr3C2 binder phase. Procedia CIRP, in Procedia CIRP, No. 3. https://doi.org/10.1016/j.procir.2018.03.180
12. Slipchenko, K. V., Petrusha, I. A., Stratiichuk, D. A. & Turkevych, V. Z. (2018). The Influence of VC—Al Additive on Wear Resistance of cBN-based Composites. J. Superhard Mater., 40, No. 3. https://doi.org/10.3103/S1063457618030115
13. Benko, E., Wyczesany, A., Bernasik, A., Barr, T. L. & Hoope, E. (2000). CBN-Cr/Cr3C2 composite materials: Chemical equilibria, XPS investigations. Ceram. Int., 26, No. 5, pp. 545-550. https://doi.org/10.1016/S0272-8842(99)00093-0