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-2024-6-28-43powder-937Research ArticleСамораспространяющийся высокотемпературный синтезSelf-Propagating High-Temperature Synthesis (SHS)Азидный самораспространяющийся высокотемпературный синтез высокодисперсной порошковой композиции AlN–SiC с применением политетрафторэтиленаAzide self-propagating high-temperature synthesis of a highly dispersed AlN–SiC powder composition using polytetrafluoroethylenehttps://orcid.org/0000-0003-1994-5672АмосовА. П.AmosovA. P.

Александр Петрович Амосов – д.ф.-м.н., профессор, зав. кафедрой «Металловедение, порошковая металлургия, наноматериалы»

Россия, 443100, г. Самара, ул. Молодогвардейская, 244

Aleksandr P. Amosov – Dr. Sci. (Phys.-Math.), Professor, Head of the Department of Metallurgy, Powder Metallurgy, Nanomaterials

244 Molodogvardeyskaya Str., Samara 443100, Russia

egundor@yandex.ruhttps://orcid.org/0000-0001-6292-280XТитоваЮ. В.TitovaYu. V.

Юлия Владимировна Титова – к.т.н., доцент кафедры «Металловедение, порошковая металлургия, наноматериалы»

Россия, 443100, г. Самара, ул. Молодогвардейская, 244

Yuliya V. Titova – Cand. Sci. (Eng.), Associate Professor of the Department of the Department of Metallurgy, Powder Metallurgy, Nanomaterials

244 Molodogvardeyskaya Str., Samara 443100, Russia

titova600@mail.ruhttps://orcid.org/0000-0003-3023-3289УвароваИ. А.UvarovaI. A.

Ирина Александровна Уварова – мл. науч. сотрудник научно-исследовательского сектора кафедры «Металловедение, порошковая металлургия, наноматериалы»

Россия, 443100, г. Самара, ул. Молодогвардейская, 244

Irina A. Uvarova – Junior Researcher of the Research Sector of the Department of the Department of Metallurgy, Powder Metallurgy, Nanomaterials 

244 Molodogvardeyskaya Str., Samara 443100, Russia

mr.simple2@mail.ruhttps://orcid.org/0000-0002-6430-9408БеловаГ. С.BelovaG. S.

Галина Сергеевна Белова – к.т.н., доцент кафедры «Металловедение, порошковая металлургия, наноматериалы»

Россия, 443100, г. Самара, ул. Молодогвардейская, 244

Galina S. Belova – Cand. Sci. (Eng.), Associate Professor of the Department of the Department of Metallurgy, Powder Metallurgy, Nanomaterials 

244 Molodogvardeyskaya Str., Samara 443100, Russia

galya.belova.94@mail.ruСамарский государственный технический университетРоссияSamara State Technical UniversityRussian Federation2024181220241862843Copyright © Амосов А.П., Титова Ю.В., Уварова И.А., Белова Г.С., 20242024Амосов А.П., Титова Ю.В., Уварова И.А., Белова Г.С.Amosov A.P., Titova Y.V., Uvarova I.A., Belova G.S.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/937

Композиционная керамика из нитрида алюминия с карбидом кремния (AlN–SiC) является перспективной для применения как в металлургии и машиностроении в качестве огнеупорного и конструкционного материала с повышенными свойствами, так и в электронике и фотонике в качестве нового материала для создания соответствующих разнообразных высокоэффективных устройств. Для изготовления из нее изделий с наилучшими свойствами необходимо использовать композиции (смеси) высокодисперсных порошков AlN и SiC с размером частиц менее 1 мкм. Настоящая работа посвящена усовершенствованию простого энергосберегающего метода азидного самораспространяющегося высокотемпературного синтеза (СВС) композиций таких порошков из смесей порошка азида натрия (NaN3) и элементных порошков алюминия, кремния и углерода за счет применения активирующей и карбидизирующей добавки порошкового политетрафторэтилена (ПТФЭ). При сжигании этих смесей в насыпном или прессованном виде в реакторе с давлением газообразного азота 3 МПа оценивались температура и давление, а также выход твердых продуктов горения. С применением сканирующей электронной микроскопии и рентгенофазового анализа определялись микроструктура и фазовый состав продуктов горения. Применение добавки ПТФЭ позволило устранить в большинстве случаев недостатки традиционного подхода азидного СВС с использованием галоидных солей (NH4)2SiF6 , AlF3 и NH4F. При сохранении высокой дисперсности синтезированных композиций порошков AlN–SiC их фазовый состав, особенно в случае прессованных шихт, стал значительно ближе к задаваемому теоретическому составу, также существенно выросло содержание фазы SiC, исчезли нежелательные побочные фазы нитрида кремния и водонерастворимой соли криолита Na3AlF6 .

Composite ceramics from aluminum nitride with silicon carbide (AlN–SiC) is promising for applications in both metallurgy and mechanical engineering as a refractory and structural material with enhanced properties, as well as in electronics and photonics as an advanced material for creating various high-performance devices. To fabricate products with optimal properties, compositions (mixtures) of highly dispersed AlN and SiC powders with particle sizes of less than 1 μm must be used. This study is dedicated to improving a simple, energy-efficient method of azide self-propagating high-temperature synthesis (SHS) for such powder compositions, using mixtures of sodium azide (NaN3 ) powder and elemental powders of aluminum, silicon, and carbon with the addition of polytetrafluoroethylene (PTFE) powder as an activating and carbidizing additive. During the combustion of these mixtures in a bulk or pressed form in a reactor under 3 MPa of nitrogen gas pressure, the temperature, pressure, and yield of solid combustion products were evaluated. Scanning electron microscopy and X-ray phase analysis were employed to determine the microstructure and phase composition of the combustion products. The addition of PTFE helped to eliminate, in most cases, the drawbacks of the traditional azide SHS approach using halide salts such as (NH4)2SiF6 , AlF3 , and NH4F. While maintaining the high dispersity of the synthesized AlN–SiC powder compositions, their phase composition, particularly in pressed charges, became significantly closer to the targeted theoretical composition, with a substantial increase in SiC phase content and the elimination of undesirable by-products such as silicon nitride and the water-insoluble cryolite salt Na3AlF6 .

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