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Ceramic material based on TiB2-FeSi using the reaction sintering method under SPS conditions

DOI: 10.62564/M4-OD1542

Oleksandr Derev'yanko, Tetyana Istomina, Roman Lytvyn, Oleksandr Myslyvchenko, Dmytro Verbylo, Ostap Zgalat-Lozynskyy

Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine


When creating new heterogeneous structural materials based on TiB2, the addition of binding components [1]. This has a positive effect on wear resistance, strength, and crack resistance. One of the promising directions for the consolidation of ceramics based on TiB2 is the use of spark plasma sintering (SPS) technology. In order to obtain a ceramic composite material based on the TiB2-FeSi composition, a mixture of powders with a composition (vol. fr.) of 27%TiH1.5-62%TiB2-9%TiSi2-2%Fe was used [2]. The SPS process was performed without the use of a protective chamber with a vacuum/gas environment [3]. The total duration of electromechanical processing was 210 s. The required temperature level of 970 С was reached in the first 60 s. The last 150 s was spent isothermally holding at the specified temperature. The total electric current through the mold was constant after 60 s, and was kept at 2.0 kA, as was the temperature. The mechanical load during SPS was at the level of 35-40 MPa. X-ray structural analysis showed a difference in the composition from the initial one, which was obtained after mixing the components. Vickers HV microhardness measurement at a load of 100g showed an average value at the level of 19.7-22.39 GPa. Rockwell hardness was 75-77 HRC units. Ceramic fracture occurs at 112.2 MPa per bend without, in fact, deformation of the tested material. Research has shown that it is quite possible to obtain ceramics based on TiB2-FeSi by the SPS method without the use of a vacuum, gas, etc. environment and in a fairly short period of time in comparison with the known methods of obtaining ceramics based on TiB2. Also, in contrast to hot pressing in a vacuum, a rather small mechanical load is used for pressing. Under such insignificant conditions of electro-mechanical load and a short SPS time, sufficient mechanical characteristics of ceramics were obtained, which allow its use as a cutting tool or a sliding body in friction pairs.

Keywords
park plasma sintering (SPS) technology, TiB2, FeSi, TiSi2

Acknowledgments
Not provided

References
[1] A. I. Kharlamov, M. E. Bondarenko, A. N. Rafal. Kinetics of interaction of transition metals with silicon nitride. // Silicides and their use in technology: collection of articles. scientific works – K.: IPM AN Ukrainian SSR, 1990. – P. 35-40. [2] Makarenko G.N., Timofeeva І.І., KrushinskayaL.А., MatseraV.E., ZyatkevichD.P. "Preparation of composite powders based on titanium Boride and silicides of transition metals" Abstracts of 6-th International Samsonov conference “Materials science of refractory compounds”. Kyiv, Ukraine. May 22-24, 2018. p. 63. Access mode: "http://www.materials.kiev.ua/conferences/MTC2018/Eng\_Samson.pdf" [3] A. S. Petukhov; I. V. Khobta; A. V. Ragulya; A. V. Derevyanko; A. I. Raichenko; L. P. Isaeva; A. M. Koval’chenko. Reactive electric-discharge sintering of TiN-TiB2. - Powder Metallurgy and Metal Ceramics. – 2007, v.46, №11-12; P.525-532. https://doi.org/10.1007/s11106-007-0081-x

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