Synthesis of Ti$_3$AlC$_2$ MAX-Phase with Different Content of B$_2$O$_3$ Additives
I. M. Kirian, V. Z. Voynash, A. M. Lakhnik, A. V. Marunyak, Yе. V. Kochelab, A. D. Rud
G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
Received: 01.08.2019. Download: PDF
The MAX-phase Ti$_3$AlC$_2$ has been fabricated by sintering of the preliminary cold-pressed mixtures of elemental powders of Ti, Al and C with different contents of B$_2$O$_3$ under pressure of 320 and 640 MPa, respectively. Identification and quantification of the phases have been performed by X-ray diffraction. It has been shown when we increase concentration of boron oxide up to 5% wt. in the initial Ti$_3$Al$_{1.1}$C$_2$ powder mixture cold-pressed at 320 MPa the percentage of the MAX-phase Ti$_3$AlC$_2$ in the pellets after sintering rises up to $\sim$98.5% wt. It has been found that at the high compacting pressure of 640 MPa, the fraction of the MAX-phase Ti$_3$AlC$_2$ in the sintered pellets also abruptly increases up to $\sim$98% wt. In this instance the boron oxide amount added to the initial powder mixture before pressing was low as 1% wt. Thus, it has been found that there is a clear relationship between the percentage of boron oxide in the initial powder mixture, pressing pressure and percentage of the MAX-phase after sintering, $i.e.$ the higher compacting pressure the less amount of the boron oxide should be added to the initial powder mixture to achieve high yield of MAX-phase.
Key words: MAX-phase, ball-milling, XRD, Ti$_3$AlC$_2$, boron oxide.
URL: http://mfint.imp.kiev.ua/en/abstract/v41/i10/1273.html
DOI: https://doi.org/10.15407/mfint.41.10.1273
PACS: 61.05.cp, 61.46.-w, 81.05.Je, 81.05.Mh, 81.20.Ev
Citation: I. M. Kirian, V. Z. Voynash, A. M. Lakhnik, A. V. Marunyak, Yе. V. Kochelab, and A. D. Rud, Synthesis of Ti$_3$AlC$_2$ MAX-Phase with Different Content of B$_2$O$_3$ Additives, Metallofiz. Noveishie Tekhnol., 41, No. 10: 1273—1281 (2019)