Персона:
Джумаев, Павел Сергеевич

Научные группы

Научная группа

Лаборатория ионно-плазменной и ионно-пучковой обработки материалов (Кафедра №9)

Организационные подразделения

Организационная единица

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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Руководитель научной группы "Лаборатория ионно-плазменной и ионно-пучковой обработки материалов"

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Джумаев

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Павел Сергеевич

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Теперь показываю 1 - 10 из 13

Только метаданные
Combination of ceramic laser micromachining and printed technology as a way for rapid prototyping semiconductor gas sensors
(2021) Fritsch, M.; Mosch, S.; Vinnichenko, M.; Trofimenko, N.; Samotaev, N.; Oblov, K.; Dzhumaev, P.; Самотаев, Николай Николаевич; Облов, Константин Юрьевич; Джумаев, Павел Сергеевич
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.The work describes a fast and flexible micro/nano fabrication and manufacturing method for ceramic Micro-electromechanical systems (MEMS)sensors. Rapid prototyping techniques are demonstrated for metal oxide sensor fabrication in the form of a complete MEMS device, which could be used as a compact miniaturized surface mount devices package. Ceramic MEMS were fabricated by the laser micromilling of already pre-sintered monolithic materials. It has been demonstrated that it is possible to deposit metallization and sensor films by thick-film and thin-film methods on the manufactured ceramic product. The results of functional tests of such manufactured sensors are presented, demonstrating their full suitability for gas sensing application and indicating that the obtained parameters are at a level comparable to those of industrial produced sensors. Results of design and optimization principles of applied methods for micro-and nanosystems are discussed with regard to future, wider application in semiconductor gas sensors prototyping.
Только метаданные
Silicon MEMS Thermocatalytic Gas Sensor in Miniature Surface Mounted Device Form
(2021) Samotaev, N.; Samotaev, N; Dzhumaev, P.; Oblov, K.; Pisliakov, A.; Самотаев, Николай Николаевич; Джумаев, Павел Сергеевич; Облов, Константин Юрьевич; Образцов, Иван Сергеевич
A reduced size thermocatalytic gas sensor was developed for the detection of methane over the 20% of the explosive concentration. The sensor chip is formed from two membranes with a 150 mu m diameter heated area in their centers and covered with highly dispersed nano-sized catalyst and inert reference, respectively. The power dissipation of the chip is well below 70 mW at the 530 degrees C maximum operation temperature. The chip is mounted in a novel surface mounted metal-ceramic sensor package in the form-factor of SOT-89. The sensitivity of the device is 10 mV/v%, whereas the response and recovery times without the additional carbon filter over the chip are <500 ms and <2 s, respectively. The tests have shown the reliability of the new design concerning the hotplate stability and massive encapsulation, but the high degradation rate of the catalyst coupled with its modest chemical power limits the use of the sensor only in pulsed mode of operation. The optimized pulsed mode reduces the average power consumption below 2 mW.
Только метаданные
Corrosion of EP823 Steel Cladding Under Heavy Liquid-Metal-Coolant Reactor Conditions: A Review
(2024) Isayev, R.; Pukhareva, N.; Malinovskiy, E.; Korenevski, E.; Dzhumaev, P.; Исаев, Рафаэл Шахбаз Оглы; Пухарева, Наталья Алексеевна; Малиновский, Евгений Дмитриевич; Кореневский, Егор Леонидович; Джумаев, Павел Сергеевич
Только метаданные
Interaction of a diffusion barrier from the refractory metals with a zirconium alloy and a chrome coating of an accident tolerant fuel
(2023) Isayev, R.; Dzhumaev, P.; Исаев, Рафаэл Шахбаз Оглы; Джумаев, Павел Сергеевич
Открытый доступ
Regularities of Changes in the Structure of Different Phases of Deformed Zirconium Alloys as a Result of Raising the Annealing Temperature According to Texture Analysis Data
(2023) Isaenkova, M.; Krymskaya, O.; Klyukova, K.; Bogomolova, A.; Kozlov, I.; Dzhumaev, P.; Fesenko, V.; Исаенкова, Маргарита Геннадьевна; Крымская, Ольга Александровна; Богомолова, Анастасия Владимировна; Козлов, Илья Владимирович; Джумаев, Павел Сергеевич; Фесенко, Владимир Александрович
Based on the data of synchrotron and electron microscopic studies of deformed and annealed Russian zirconium alloys, the possibility of analyzing the structural-phase state and crystallographic texture of individual phases has been demonstrated. A qualitative and quantitative phase analysis of deformed and annealed tubes made of Zr-Nb-(Sn-Fe-O) alloys was carried out using diffraction patterns obtained with synchrotron radiation. The main О±-Zr phase and the following additional phases: ОІ-Nb, ОІ-Zr, and the Laves phase (intermetallic compound Zr(Nb,Fe)2), were found in the alloys. According to the results of texture analysis of all phases present in the alloy, the mechanisms of plastic deformation, recrystallization, and phase transformations of the main and additional phases were established. It is shown that during plastic deformation of the Zr-1%Nb alloy, a dynamic phase transformation ОІ-Nbв†’О±-Zrв†’ОІ-Zr is observed. It is established that during recrystallization, larger grains of О±-Zr are misoriented relative to the deformed matrix by rotating the prismatic axes around the basal axes by 30В°, while fine grains are improved by polygonization and maintain the orientation of the deformed matrix. Processes for changing the orientation of grains of additional phases as a result of high-temperature annealing are also considered.
Открытый доступ
Joining tungsten with steel for DEMO: Simultaneous brazing by Cu-Ti amorphous foils and heat treatment
(2021) Svetogorov, R.; Bachurina, D.; Suchkov, A.; Gurova, J.; Savelyev, M.; Dzhumaev, P.; Kozlov, I.; Leont'eva-Smirnova, M.; Sevryukov, O.; Сучков, Алексей Николаевич; Гурова, Юлия Александровна; Савельев, Максим Дмитриевич; Джумаев, Павел Сергеевич; Козлов, Илья Владимирович; Леонтьева-Смирнова, Мария Владимировна; Севрюков, Олег Николаевич
© 2020Development of a reliable technology to join tungsten with steel is essential for DEMO application; however, it is difficult due to large differences in their physical properties. To solve this problem, high-temperature brazing was carried out. Cu-Ti brazing alloys, which were rapidly solidified into foil, were used together with a compensating vanadium interlayer, so the EK-181 steel/Cu-28Ti/V/Cu-50Ti/W and EK-181/Cu-50Ti/V/Cu-50Ti/W brazed joints were obtained. The microstructures of the seams were investigated by optical microscopy, SEM (EDX, EBSD) and synchrotron XRD. Thermocycling and shear strength tests showed that Cu-28Ti wt. % brazing alloy ensures a firmer joint compared to Cu-50Ti wt. %. The Cu-28Ti wt. % brazing alloy was used to perform high-temperature brazing in the brazing mode equivalent to traditional EK-181 steel heat treatment. It showed that every step of the heat treatment affected the microstructures and the shear strength.
Открытый доступ
Thermal Conductivity Gas Sensors for High-Temperature Applications
(2024) Samotaev, N.; Podlepetsky, B.; Mashinin, M.; Ivanov, I.; Obraztsov, I.; Oblov, K.; Dzhumaev, P.; Самотаев, Николай Николаевич; Подлепецкий, Борис Иванович; Машинин, Михаил Олегович; Иванов, Игорь Александрович; Образцов, Иван Сергеевич; Облов, Константин Юрьевич; Джумаев, Павел Сергеевич
This paper describes a fast and flexible microfabrication method for thermal conductivity gas sensors useful in high-temperature applications. The key parts of the sensor, the microheater and the package, were fabricated from glass-coated platinum wire and the combination of laser micromilling (ablation) of already-sintered monolithic ceramic materials and thick-film screen-printing technologies. The final thermal conductivity gas sensor was fabricated in the form of a complete MEMS device in a metal ceramic package, which could be used as a compact miniaturized surface-mounted device for soldering to standard PCB. Functional test results of the manufactured sensor are presented, demonstrating their full suitability for gas sensing applications and indicating that the obtained parameters are at a level comparable to those of standard industrially produced sensors. The results of the design and optimization principles of applied methods are discussed with regard to possible wider applications in thermal gas sensor prototyping in the future. The advantage of the developed sensors is their ability to operate in air environments under high temperatures of 900 ‚шC and above. The sensor element material and package metallization were insensitive to oxidation compared with classical sensor-solution-based metalў??glass packages and silicone MEMS membranes, which exhibit mechanical stress at temperatures above 700 ‚шC.
Открытый доступ
Study 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.
Открытый доступ
Corrosion of reduced activation ferritic-martensitic steel – Tungsten brazed joints in liquid lithium
(2023) Popov, N.; Bachurina, D.; Bogdanov, R.; Kozlov, I.; Dzhumaev, P.; Sevryukov, O.; Suchkov, A.; Krutikova, O.; Попов, Никита Сергеевич; Козлов, Илья Владимирович; Джумаев, Павел Сергеевич; Севрюков, Олег Николаевич; Сучков, Алексей Николаевич; Крутикова, Ольга Михайловна
Открытый доступ
Brazing 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