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-2022-2-38-51powder-698Research ArticleСамораспространяющийся высокотемпературный синтезSelf-Propagating High-Temperature Synthesis (SHS)Самораспространяющийся высокотемпературный синтез боридной керамики на основе MAB-фазы состава MoAlBSelf-propagating high-temperature synthesis of MoAlB boride ceramics based on MAB-phaseПотанинА. Ю.PotaninA. Yu.

канд. техн. наук, ст. науч. сотрудник Научно-учебного центра (НУЦ) СВС МИСиС–ИСМАН

119991, г. Москва, Ленинский пр-т, 4

Cand. Sci. (Eng.), Senior researcher of the Scientific-Educational Centеr of SHS of MISIS–ISMAN

119991, Russia, Moscow, Leninskii pr., 4

a.potanin@inbox.ruБашкировЕ. А.BashkirovE. A.

инженер научного проекта НУЦ СВС МИСиС–ИСМАН

г. Москва

Scientific project engineer, Scientific-Educational Centеr of SHS of MISIS–ISMAN

Moscow

evgenij_010397@mail.ruПогожевЮ. С.PogozhevYu. S.

канд. техн. наук, доцент кафедры порошковой металлургии и функциональных покрытий (ПМиФП); вед. научный сотрудник НУЦ СВС МИСиС–ИСМАН

г. Москва

Cand. Sci. (Eng.), Associate professor of the Department of powder metallurgy and functional coatings (PM&FC) of NUST «MISIS»; Leading researcher of the Scientific-Educational Centеr of SHS of MISIS–ISMAN

Moscow

yspogozhev@mail.ruКовалевД. Ю.KovalevD. Yu.

докт. физ.-мат. наук, зав. лабораторией рентгеноструктурных исследований ИСМАН

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

Dr. Sci. (Phys.-Math.), Head of the Laboratory of X-ray diffraction studies

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

kovalev@ism.ac.ruКочетовН. А.KochetovN. A.

канд. физ.-мат. наук, ст. науч. сотрудник лаборатории динамики микрогетерогенных процессов ИСМАН

г. Черноголовка

Cand. Sci. (Phys.-Math.), Senior researcher of the Laboratory of dynamics of microheterogeneous processes, ISMAN

Chernogolovka

kolyan_kochetov@mail.ruЛогиновП. А.LoginovP. A.

канд. техн. наук, ст. науч. сотрудник лаборатории «In situ диагностика структурных превращений»; ст. преподаватель кафедры ПМиФП

г. Москва

Cand. Sci. (Eng.), Senior research scientist of the Laboratory «In situ diagnostics of structural transformations»; senior lecturer of the Department of PM&FC

Moscow

pavel.loginov.misis@list.ruЛевашовЕ. А.LevashovE. A.

докт. техн. наук, проф., акад. РАЕН, зав. кафедрой ПМиФП; директор НУЦ СВС МИСиС–ИСМАН

г. Москва

Dr. Sci. (Eng.), Prof., Acad. of Russian Academy of Natural Science, Head of the Department of PM&FC; Head of the Scientific-Educational Centеr of SHS

Moscow

levashov@shs.misis.ruНациональный исследовательский технологический университет (НИТУ) «МИСиС»РоссияNational University of Science and Technology «MISIS» (NUST «MISIS»)Russian FederationИнститут структурной макрокинетики и проблем материаловедения им. А.Г. Мержанова РАН (ИСМАН)РоссияMerzhanov Institute of Structural Macrokinetics and Materials Science of the Russian Academy of Sciences (ISMAN)Russian Federation202216062022023851Copyright © Потанин А.Ю., Башкиров Е.А., Погожев Ю.С., Ковалев Д.Ю., Кочетов Н.А., Логинов П.А., Левашов Е.А., 20222022Потанин А.Ю., Башкиров Е.А., Погожев Ю.С., Ковалев Д.Ю., Кочетов Н.А., Логинов П.А., Левашов Е.А.Potanin A.Y., Bashkirov E.A., Pogozhev Y.S., Kovalev D.Y., Kochetov N.A., Loginov P.A., Levashov E.A.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/698

Работа посвящена исследованию кинетики и механизмов горения реакционных смесей в тройной системе Mo–Al–B, рассчитанных на образование MAB-фазы состава MoAlB. Показано влияние начальной температуры на основные параметры процесса горения. Установлено, что предварительный подогрев реакционной смеси слабо влияет на максимальную температуру горения. Рассчитано значение эффективной энергии активации процесса самораспространяющегося высокотемпературного синтеза (СВС). С применением баз данных AFLOW и Materials Project построены фазовые диаграммы в системе Mo–Al–B. Изучены фазовый состав и структура синтезированной керамики, в которой основной составляющей являются пластинчатые зерна MoAlB толщиной 0,4 мкм и длиной 2–10 мкм. Также идентифицированы линии промежуточных боридов MoB и Mo2B5, суммарная доля которых не превышает 3 %. Методами сканирующей электронной микроскопии и энергодисперсионной спектроскопии в межзеренных порах установлено наличие фазы Al2O3. Изучена стадийность химических превращений в волне горения и сделано предположение о механизме структурообразования. В процессе СВС первичными фазами могут являться MoO2 и Al2O3, при этом фаза MoAlB образуется из борсодержащего алюминий-молибденового расплава. Выявлено, что субмикронные выделения МoB формируются в зоне дореагирования в результате частичного окисления алюминия по механизму дисперсного упрочнения.

This study focuses on the combustion kinetics and mechanisms of reaction mixtures in the Mo–Al–B ternary system taken so that the MoAlB MAB phase was formed. The effect of the initial temperature on the key combustion parameters was demonstrated. Reaction mixture preheating was found to weakly affect the maximum combustion temperature. The effective activation energy of self-propagating high-temperature synthesis (SHS) was calculated. Phase diagrams in the Mo–Al–B system were built using the AFLOW and Materials Project databases. The phase composition and structure of the synthesized ceramics with MoAlB lamellar grains 0.4 μm thick and ~2–10 μm long as a main component were studied. The DXRD lines of MoB and Mo2B5 intermediate borides with their total content of ≤3 % were also identified. Scanning electron microscopy and energy dispersive spectroscopy studies revealed that the Al2O3 phase was present in the intergranular pores. A sequence of chemical transformations in the combustion wave was studied, and a hypothesis about the structure formation mechanism was put forward. MoO2 and Al2O3 can be the primary phases during SHS, and the MoAlB phase is formed from the boron-containing aluminum–molybdenum melt. Submicron-sized MoB precipitates are formed in the post-combustion zone due to the partial oxidation of aluminum by the dispersion strengthening mechanism.

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