MATEC Web Conf.
Volume 340, 2021VII International Russian - Kazakhstan Conference “Chemical Technologies of Functional Materials” (RKFM 2021)
|Number of page(s)||5|
|Published online||08 July 2021|
Carbothermal and boron carbide reduction of oxides of some transition metals
1 Novosibirsk State Technical University, 20, K. Marx Prospect, Novosibirsk, Russia, 630071
2 Novosibirsk State University of Architecture and Civil Engineering, 113, Leningradskaya St., Novosibirsk, Russia, 630008
3 Institute of Solid State Chemistry and Mechanochemistry, SB RAS, 18, Kutateladze St., Novosibirsk, Russia, 30090
一 Correspondingauthor: firstname.lastname@example.org
The study presents a possible mechanism to produce carbides and diborides of transition metals, such as titanium, vanadium, chromium and zirconium. The carbothermal synthesis of transition metal carbides has defined the direct dependence between the thermodynamic stability of oxides and the temperature range of the reduction onset (the stronger the oxide, the higher the value of the temperature is). It reaches 2000-2100, 1500-1600, 1300-1400 and 2100-2200°C for such carbides as TiC, VC0,88, Cr3C2 and ZrC respectively. The same dependence has not been found for the diborides of these metals. Optimum synthesis temperatures for all these compounds lie in the range of 1600-1700 °C. This viable method to produce transition metal carbides consists in the transfer of vaporous higher and lower oxides. Diborides preparation involves the transfer of oxides and boron vapors onto the surface of the carbon material with the subsequent chemical interaction. In the case of carbide-boron reduction of zirconium oxide in excess of boron carbide, the reaction product will be a composite material (B4C – ZrB2). The ceramics based on this composite possesses high performance properties.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.