Methods of compacting nanostructured tungsten–cobalt alloys from Nanopowders obtained by plasma chemical synthesis

Blagoveshchenskiy, Yu. V.; Isayeva, N. V.; Blagoveshchenskaya, N. V.; Mel'nik, Yu. I.; Chuvil'deyev, V. N.; Нохрин, А. В.; Сахаров, Н. В.; Болдин, М. С.; Smirnov, Ye. S.; Шотин, С. В.; Levinsky, Yu. V.; Vol'dman, G. M.

doi:10.1134/s2075113315050032

Cited by 23 publications

(5 citation statements)

References 33 publications

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“…When heating the WC nanopowders, adsorbed oxygen reacts with carbon and forms CO 2 [59,60]. This results in a decrease in the carbon concentration in α-WC nanopowders and facilitates the formation of η-phase particles in the WC-Co system [3,5,81,91]. Figure 11 shows photographic images of UFG hard alloys obtained by SPS from WC-10Co plasma-chemical nanopowders with various concentrations of graphite.…”

Section: Sintering Of Nanopowdersmentioning

confidence: 99%

“…Note also that, for the purposes of obtaining nano-and UFG hard alloys, DC arc plasma synthesis of refractory carbide nanopowders has an apparent potential [80][81][82][83]. It has been demonstrated that DC arc plasma synthesis technology allows SPS to be used to obtain specimens of tungsten carbide and hard alloys with high properties (hardness, fracture toughness) [84][85][86][87].…”

Section: Introductionmentioning

confidence: 99%

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A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

et al. 2021

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This study investigates the impact of carbon on the kinetics of the spark plasma sintering (SPS) of nano- and submicron powders WC-10wt.%Co. Carbon, in the form of graphite, was introduced into powders by mixing. The activation energy of solid-phase sintering was determined for the conditions of isothermal and continuous heating. It has been demonstrated that increasing the carbon content leads to a decrease in the fraction of η-phase particles and a shift of the shrinkage curve towards lower heating temperatures. It has been established that increasing the graphite content in nano- and submicron powders has no significant effect on the SPS activation energy for “mid-range” heating temperatures, QS(I). The value of QS(I) is close to the activation energy of grain-boundary diffusion in cobalt. It has been demonstrated that increasing the content of graphite leads to a significant decrease in the SPS activation energy, QS(II), for “higher-range” heating temperatures due to lower concentration of tungsten atoms in cobalt-based γ-phase. It has been established that the sintering kinetics of fine-grained WC-Co hard alloys is limited by the intensity of diffusion creep of cobalt (Coble creep).

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Section: Sintering Of Nanopowdersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

et al. 2021

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“…При участии Ю.В. Благовещенского методом плазмохимического синтеза впервые были получены нанопорошки WC и сплавов WC-Co для производства ТС нового поколения [29]. Данные порошки нашли применение в СВС-технологии получения наномодифицированных сплавов [20,21].…”

Section: историческая справкаunclassified

“…За счет использования плазмохимического WC, введения ингибиторов и оптимизации технологии получения смеси WC-Co авторы получили ультрадисперсные сплавы. Методом электроискрового плазменного спекания порошков WC-Co с различным содержанием кобальта были получены сплавы с повышенными, по мнению авторов, свойствами, которые должны определить перспективу дальнейшего развития отечественных твердых сплавов [29,30].…”

Section: историческая справкаunclassified

History of Domestic Cemented Carbides

Левашов¹,

Панов²,

Коняшин³

2017

Izv. VUZ. Poroshk. Met.

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В современной технике спеченные твердые сплавы имеют очень большое значение. Трудно назвать отрасль промышленности, в которой в той или иной мере не использовались бы твердые сплавы. Уникальные свойства по твердости, прочности, износостойкости, окалино-и жаропрочности, коррозионной стойкости позволяют применять твердосплавные изделия в качестве режущего инструмента, при бурении нефтяных скважин, в горно-обрабатывающей промышленности, при бесстружковой обработке металлов, в военной, атомной и космической технике, измерительном инструменте, вакуумной и электротехнической технике, для получения синтетических алмазов и др. В настоящей работе представлен обзор этапов появления и развития производства отечественных твердых сплавов. Показан вклад отечественных ученых в разработку различных марок твердых сплавов и становление их производства. Отмечена выдающаяся роль проф. Г.А. Меерсона в вопросе развития твердосплавной промышленности. Приведены результаты исследований многих ученых из России и стран СНГ из таких институтов, как Всероссийский научно-исследовательский институт твердых сплавов (г. Москва), Украинский институт материаловедения (г. Киев), Институт сверхтвердых материалов (г. Киев), Уральский филиал РАН (г. Кировоград), Уральский политехнический институт (г. Екатеринбург), Томский политехнический институт (г. Томск), Белорусский институт порошковой металлургии (г. Минск), Институт металлургии и материаловедения (г. Москва), Институт структурной макрокинетики и проблем материаловедения РАН (г. Черноголовка, Московская обл.).

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“…The application of the SPS technology makes it possible to reduce the sintering temperatures by 200 °C, which preserves the WC grain size, uses alternative molds [ 55 ], and provides reactive synthesis [ 56 ]. Considerable experience has been accumulated in using traditional and modern methods of sintering WC-Co nanopowders produced by plasma chemical synthesis [ 57 ]. The influence of carbon on the SPS kinetics of WC-10wt%Co nano- and submicron powders has been investigated [ 58 ].…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

et al. 2022

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The paper describes the method for producing WC-10wt%Co hard alloy with 99.6% of the theoretical density and a Vickers hardness of ~1400 HV 0.5. Experimental data on densification dynamics, phase composition, morphology, mechanical properties, and grain size distribution of WC-10%wtCo using spark plasma sintering (SPS) within the range of 1000–1200 °C are presented. The high quality of the product is provided by the advanced method of high-speed powder mixture SPS-consolidation at achieving a high degree of densification with minimal calculated grain growth at 1200 °C.

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Methods of compacting nanostructured tungsten–cobalt alloys from Nanopowders obtained by plasma chemical synthesis

Cited by 23 publications

References 33 publications

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

History of Domestic Cemented Carbides

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

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