Influence of the synthesis conditions of boron carbide on its structural parameters
https://doi.org/10.17073/1997-308X-2015-3-18-24
Abstract
Boron carbide is prepared by self-propagating high-temperature synthesis (SHS) in a range of compositions from 5 to 30 at.% carbon. The introduction of inert (MgO) and active (Mg(ClO4)2) additives leads to the variation in process parameters such as the temperature and combustion rate. It is established that depending on the synthesis conditions, the metrics of the unit cell of boron carbide is subjected to substantial variations. The degree of the effect of the SHS mode on the crystal structure increases with an increase in the carbon fraction in the boron carbide structure. The observed regularity is associated with the diversity of ordering of carbide atoms in nonstoichiometric boron carbide. No influence of the synthesis conditions is observed for the stoichiometric boron carbide, which is associated with the saturation of the structure with carbon. It is shown that the variation in the combustion temperature at SHS of boron carbide of the same composition leads to the variability of structural parameters reflecting the influence of the synthesis conditions on the crystal structure of the material.
About the Authors
D. Yu. Kovalev
Институт структурной макрокинетики и проблем материаловедения РАН (ИСМАН), г. Черноголовка, Московская обл.
Russian Federation
Russian Federation
V. I. Ponomarev
Институт структурной макрокинетики и проблем материаловедения РАН (ИСМАН), г. Черноголовка, Московская обл.
Russian Federation
Russian Federation
S. V. Konovalikhin
Институт структурной макрокинетики и проблем материаловедения РАН (ИСМАН), г. Черноголовка, Московская обл.
Russian Federation
Russian Federation
V. I. Vershinnikov
Институт структурной макрокинетики и проблем материаловедения РАН (ИСМАН), г. Черноголовка, Московская обл.
Russian Federation
Russian Federation
I. D. Kovalev
Институт структурной макрокинетики и проблем материаловедения РАН (ИСМАН), г. Черноголовка, Московская обл.
Russian Federation
Russian Federation
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Review
For citations:
Kovalev D.Yu., Ponomarev V.I., Konovalikhin S.V., Vershinnikov V.I., Kovalev I.D. Influence of the synthesis conditions of boron carbide on its structural parameters. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2015;(3):18-24. (In Russ.) https://doi.org/10.17073/1997-308X-2015-3-18-24
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