Персона: Федотов, Иван Владимирович
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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- ПубликацияТолько метаданныеStudy of Ti-Zr-Nb-Be filler metal interaction with silicon carbide based ceramics during brazing process(2020) Eroshenko, A. A.; Ivannikov, А. A.; Fedotov, I. V.; Suchkov, A. N.; Dzhumaev, P. S.; Sevryukov, O. N.; Иванников, Александр Александрович; Федотов, Иван Владимирович; Сучков, Алексей Николаевич; Джумаев, Павел Сергеевич; Севрюков, Олег Николаевич© Published under licence by IOP Publishing Ltd.This work is devoted to an analysis of the composition of a silicon carbide based ceramic brazed seam as a result of its interaction with rapidly quenched titanium-zirconium-niobium-beryllium filler metal. Structural-phase studies based on EDX and EBSD analysis, mechanical shear tests, and microhardness measurements of brazed joints were carried out. It was shown that titanium, zirconium, and niobium silicides as well as particles of titanium carbosilicides and silicon carbides in the silicon matrix are formed in the brazed seam, probably because of the presence of free silicon in the base material, which leads to increasing joint microhardness and unstable shear strength results.
- ПубликацияТолько метаданныеStudy of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal(2021) Sliva, A.; Svetogorov, R.; Fedotov, I.; Suchkov, A.; Dzhumaev, P.; Kozlov, I.; Bachurina, D.; Sevryukov, O.; Федотов, Иван Владимирович; Сучков, Алексей Николаевич; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Севрюков, Олег Николаевич© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.The aim of this work was to braze molybdenum and graphite with Ti–40Zr–8.5Nb–1.5Be filler metal in order to demonstrate the possibility of its application for X-ray tube target brazing, further to investigate the joint microstructure using energy-dispersive X-ray spectroscopy (EDS), electron backscattered diffraction (EBSD), X-ray diffraction (XRD), and electron microscopy as well as to conduct shear and unbrazing tests. It is shown that the brazed joint consists of matrix from β-(Ti, Mo) solid solution, mixed ZrC and TiC carbide layers at the braze/graphite interface, and beryllides TiBe2 and MoBe2 located at the grain boundaries of β-(Ti, Mo). The presented data made it possible to propose a brazed joint formation mechanism and explain the concentration of beryllides at the grain boundaries during brazing, as well as the mixed carbide layer formation from the side of the graphite. The mechanical tests showed that Mo/graphite brazed joints have a shear strength of at least 28.0 ± 0.9 MPa. However, sample failure occurred through the graphite due to the graphite surface mechanical treatment and the presence of a ductile β-Ti phase in the joint. The evaluation of joint thermal properties was performed using unbrazing tests. The unbrazing temperature was 1882 °C, which was caused by formation of refractory phases during brazing. The microstructure study shows that unbrazing occurs through the β-(Ti, Mo) phase with grain boundaries and beryllides eutectic melting.
- ПубликацияТолько метаданныеTHE CERAMIC MODULAR HEAD IMPROVEMENT IN THE DESIGN OF A TOTAL HIP REPLACEMENT(2021) Pakhaliuk, V.; Poliakov, A.; Fedotov, I.; Федотов, Иван ВладимировичFor the first time, a design of a modular ceramic ball head of a total hip joint replacement (THR) friction pair has been developed, which has the properties of a metal in conjunction with the stem neck and the properties of a ceramics on bearing surface of the pair. This is achieved by creating a low-cost, low-toxic, durable fixed connection of the head made of alumina or zirconia ceramics and the titanium-based alloy sleeve to obtain a brazed joint that is efficient in human synovial fluid. With the help of finite element analysis, a quantitative assessment of the strength and rigidity of the proposed head design was performed and its use in modern hip arthroplasty was indicated. The approbation of the proposed design solutions for creating a THR ceramic head with a titanium-based alloy sleeve brazed was carried out.
- ПубликацияТолько метаданныеMicrostructure and defect-based fatigue mechanism evaluation of brazed coaxial ti/al2o3 joints for enhanced endoprosthesis design(2021) Otto, J. L.; Schaum, T.; Kalenborn, A.; Walther, F.; Fedotov, I.; Penyaz, M.; Kalin, B.; Sevryukov, O.; Федотов, Иван Владимирович; Севрюков, Олег Николаевич© 2021 by the authors. Licensee MDPI, Basel, Switzerland.Alumina-based ceramic hip endoprosthesis heads have excellent tribological properties, such as low wear rates. However, stress peaks can occur at the point of contact with the prosthesis stem, increasing the probability of fracture. This risk should be minimized, especially for younger and active patients. Metal elevations at the stem taper after revision surgery without removal of a well-fixed stem are also known to increase the risk of fracture. A solution that also eliminates the need for an adapter sleeve could be a fixed titanium insert in the ceramic ball head, which would be suitable as a damping element to reduce the occurrence of stress peaks. A viable method for producing such a permanent titanium–ceramic joint is brazing. Therefore, a brazing method was developed for coaxial samples, and two modifications were made to the ceramic surface to braze a joint that could withstand high cyclic loading. This cyclic loading was applied in multiple amplitude tests in a self-developed test setup, followed by fractographic studies. Computed tomography and microstructural analyses—such as energy dispersive X-ray spectroscopy—were also used to characterize the process–structure–property relationships. It was found that the cyclic loading capacity can be significantly increased by modification of the surface structure of the ceramic.
- ПубликацияТолько метаданныеBrazing SMART tungsten alloys to RAFM steels by Titanium-Zirconium-Beryllium brazing alloy(2024) Kirillova, V. O.; Popov, N. S.; Gurova, J. A.; Fedotov, I. V.; Suchkov, A. N.; Кириллова, Вероника Олеговна; Попов, Никита Сергеевич; Гурова, Юлия Александровна; Федотов, Иван Владимирович; Сучков, Алексей Николаевич
- ПубликацияОткрытый доступInteraction of iron melt with tungsten and WFe composite structure evolution(2024) Popov, N.; Suchkov, A.; Zharkov, M.; Kirillova, V.; Bazhenov, A.; Fedotov, I.; Bajenova, I.; Khvan, A.; Kozlov, I.; Vertkov, A.; Sevryukov, O.; Попов, Никита Сергеевич; Федотов, Иван Владимирович; Баженов, Александр Андреевич; Кириллова, Вероника Олеговна; Сучков, Алексей НиколаевичDevelopment of new plasma facing components (PFC) draw attention of numerous scientific groups in fusion energy field. Tungsten as a main PFC material main have poor machinability, thus various designs were proposed to overcome this problem. However, such technologies as functional graded layers, sintering and additive technologies are limited in production size and have low cost-efficiency. This research considers the alternative approach of steel melt injection or melt infiltration of tungsten mesh. The results obtained establish the mechanism of phase evolution during interaction of solid W with liquid steel and iron. Energy dispersive spectroscopy, X-ray diffraction and Thermocalc calculations used to analyze the phase composition of tungsten wetted with various steels and pure iron. Results show that interaction rate significantly depends on melt temperature and overheating above its liquidus. Then the overheating exceeds 150 °C erosion of tungsten occur.
- ПубликацияОткрытый доступСоздание термостойкого неразъемного соединения молибдена с графитом для изготовления комбинированного анода рентгеновской трубки(2022) Федотов, И. В.; Федотов, Иван Владимирович; Сучков, А. Н.
- ПубликацияОткрытый доступСПОСОБ ПОЛУЧЕНИЯ ПОРОШКОВ СЛОЖНОЛЕГИРОВАННЫХ СПЛАВОВ СО СФЕРИЧЕСКОЙ ФОРМОЙ ЧАСТИЦ(НИЯУ МИФИ, 2022) Сучков, А. Н.; Севрюков, О. Н.; Иванников, А. А.; Федотов, И. В.; Баздникина, Е. А.; Бачурина, Д. М.; Морохов, П. В.; Самохин, А. В.; Фадеев, А. А.; Завертяев, И. Д.; Морохов, Павел Владимирович; Федотов, Иван Владимирович; Севрюков, Олег Николаевич; Сучков, Алексей Николаевич; Иванников, Александр Александрович; Баздникина, Екатерина АлександровнаИзобретение относится к порошковой металлургии, а именно к способам получения металлических порошков сложнолегированных сплавов со сферической формой частиц, которые могут применяться в порошковом и аддитивном производствах. Способ включает сфероидизацию в потоке термической плазмы порошков осколочного типа. Осколочные порошки получают из аморфных лент толщиной 40-60 мкм, которые отжигают в условиях вакуума с разрежением не менее (1÷5)×10-5 Торр до кристаллического состояния для их охрупчивания. После чего кристаллические, охрупченные в процессе термообработки ленты размалывают в шаровой планетарной мельнице в среде чистого спирта и затем методом ситового анализа выделяют фракцию 40-100 мкм. Сфероидизацию проводят в плазме аргона или аргоно-водородной смеси. Обеспечивается получение порошков с высокой степенью сферичности и узким распределением гранулометрического состава с максимальным выходом заданной фракции после сфероидизации, что уменьшает количество брака при изготовлении конечных изделий методами аддитивных технологий. 2 з.п. ф-лы, 3 ил., 2 пр.
- ПубликацияТолько метаданныеBrazing of ZTA ceramic with titanium for biomedical application(2024) Fedotov, I.; Ivannikov, А.; Terekhova, S.; Dzhumaev, P.; Kozlov, I.; Klyushin, I.; Sevryukov, O.; Федотов, Иван Владимирович; Иванников, Александр Александрович; Терехова, Софья Михайловна; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Клюшин, Иван Игоревич; Севрюков, Олег Николаевич
- ПубликацияТолько метаданныеActive Brazing of Silicon Carbide with Rapidly Quenched TiZrCuBe Filler Metal(2023) Fedotov, I. V.; Suchkov, A. N.; Ivannikov, А. A.; Chernavskaya, E. R.; Dzhumaev, P. S.; Sevryukov, O. N.; Федотов, Иван Владимирович; Сучков, Алексей Николаевич; Иванников, Александр Александрович; Чернавская, Екатерина Романовна; Джумаев, Павел Сергеевич; Севрюков, Олег Николаевич