powderИзвестия вузов. Порошковая металлургия и функциональные покрытияPowder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)1997-308X2412-8767НИТУ "МИСИС"10.17073/1997-308X-2019-2-42-48powder-445Research ArticleСамораспространяющийся высокотемпературный синтез (СВС)Self-Propagating High-Temperature Synthesis (SHS)Синтез МАХ-фазы Nb2AlC методом СВС-металлургииNb2AlC MAX phase synthesis by SHS metallurgyКовалевИ. Д.KovalevI. D.

Кандидат физико-математических наук, научный сотрудник лаборатории рентгеноструктурных исследований

142432, Московская обл., г. Черноголовка, ул. Акад. Осипьяна, 8

Cand. Sci. (Phys.-Math.), Researcher, Laboratory of X-Ray diffraction studies

142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8

МилосердовП. А.MiloserdovP. A.

Кандидат технических наук, научный сотрудник лаборатории жидкофазных СВС-процессов и литых материалов

142432, Московская обл., г. Черноголовка, ул. Акад. Осипьяна, 8

Cand. Sci. (Tech.), Researcher, Laboratory of SHS melts and cast materials

142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8

yu_group@ism.ac.ruГоршковВ. А.GorshkovV. A.

Доктор физико-математических наук, ведущий научный сотрудник лаборатории жидкофазных СВС-процессов и литых материалов

142432, Московская обл., г. Черноголовка, ул. Акад. Осипьяна, 8

Dr. Sci. (Phys.-Math.), Leading researcher, Laboratory of SHS melts and cast materials

142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8

gorsh@ism.ac.ruКовалевД. Ю.KovalevD. Yu.

Кандидат технических  наук, заведующий лабораторией рентгеноструктурных исследований

142432, Московская обл., г. Черноголовка, ул. Акад. Осипьяна, 8

Cand. Sci. (Tech.), Head of Laboratory of X-Ray diffraction studies

142432, Moscow reg., Chernogolovka, Acad. Osipyan str., 8

kovalev@ism.ac.ruИнститут структурной макрокинетики и проблем материаловедения им. А.Г. Мержанова РАН (ИСМАН)РоссияInstitute of Structural Macrokinetics and Materials, Russian Academy of Sciences (ISMAN)Russian Federation201918062019024248Copyright © Ковалев И.Д., Милосердов П.А., Горшков В.А., Ковалев Д.Ю., 20192019Ковалев И.Д., Милосердов П.А., Горшков В.А., Ковалев Д.Ю.Kovalev I.D., Miloserdov P.A., Gorshkov V.A., Kovalev D.Y.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://powder.misis.ru/jour/article/view/445

Результаты термодинамических расчетов коррелируют с экспериментальными данными. Установлено существенное влияние содержания добавки CaO2–Al на термодинамические параметры и фазовый состав конечного продукта. Показано, что синтез из указанных смесей протекает в стационарном режиме с формированием устойчивой волны горения. При увеличении содержания добавки скорость горения увеличивается от 6 до 12 мм/с, выход целевого продукта в слиток возрастает от 30 до 47 % (до 15 мас.% добавки), а затем падает. Варьируя состав исходных смесей, можно существенным образом влиять как на параметры синтеза, так и на фазовый состав целевых продуктов. Установлены оптимальные условия синтеза материала, обеспечивающие максимальный выход MAX-фазы Nb2AlC в составе слитка. Определяющим фактором, влияющим на содержание Nb2AlС в конечном продукте, является время существования жидкой фазы в условиях синтеза. Показано, что максимальное количество (67 мас.%) фазы Nb2AlC достигается при содержании 15 мас.% энергетической добавки в исходной шихте.

A cast material based on the Nb2AlC MAX phase was obtained by SHS metallurgy. Synthesis was carried out from the Nb2O5– Al–C mixture with a high-energy CaO2–Al additive. Thermodynamic calculation results correlate well with experimental data. It was found that the CaO2–Al additive content has a substantial effect on the thermodynamic parameters and phase composition of the final product. It was shown that synthesis from the specified mixtures passed in a stationary mode with steady combustion wave. Increasing the additive content leads to increasing combustion rate (from 6 to 12 mm/s), and product yield to ingot increases (from 30 to 47 %) up to 15 wt.% of the additive and then decreases. Variation in the composition of initial mixtures can provide a significant impact on both synthesis parameters and final product phase composition. Optimal conditions of material synthesis to ensure maximum yield of the Nb2AlC MAX phase in the ingot composition were determined. The liquid phase lifetime during synthesis is a determining factor influencing the Nb2AlC content in the final product. It is shown that the maximum Nb2AlC phase amount (67 wt.%) is reached with 15 wt.% of the high-energy additive in the initial charge.

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The authors declare that there are no conflicts of interest present.