Углеродные Волокна На Основе Пека: Состояние Производства И Модификация Свойств

Klimenko, I. V.

doi:10.31857/s0207401x22020054

Cited by 3 publications

(3 citation statements)

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“…Эта лента используется для восстановления поверхностей контактных и промежуточных поясов конусов загрузочных устройств доменных печей, работающих на форсированных режимах [10]. Еще одна область применения -создание керметов, безвольфрамовых твердых сплавов марок КХН (карбид хрома -никель) [11]. Перспективными являются относительно недорогие карбидохромовые твердые сплавы и карбидостали со связками из железа и хромистых сталей марок Х17Н2 и Х13М2 [12].…”

Section: параметрunclassified

“…Содержание примесей (ZrO 2 и С своб ) в продуктах реакции составляло 16,88 -19,95 % (по массе). Возможной причиной такого большого содержания примесей является высокая термодинамическая стабильность оксида циркония [11]. Средний размер частиц находился на уровне 50 нм.…”

Section: осаждение из парогазовой фазыunclassified

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Carbides of transition metals: Properties, application and production. Review. Part 2. Chromium and zirconium carbides

Krutskii,

Gudyma,

Krutskaya

et al. 2023

Izv. vysš. učebn. zaved., Čern. metall.

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The properties, application, and methods for producing chromium and zirconium carbides are considered. These carbides are oxygen-free refractory metal-like compounds. As a result, they are characterized by high values of thermal and electrical conductivity. Their hardness is relatively high. Chromium and zirconium carbides exhibit significant chemical resistance in aggressive environments. For these reasons, they have found application in modern technology. Chromium carbide is used mainly as component of surfacing mixtures to create protective coatings that resist intensive abrasive wear, including at elevated temperatures (up to 800 °C) in oxidizing environments. This compound is also used in the manufacture of tungsten-free hard alloys and carbide steels. Chromium carbide, along with vanadium carbide, is used as a grain growth inhibitor in WC – Co hard alloys. Powdered zirconium carbide can be used to polish the surface of items made of ferrous and non-ferrous metals. The properties of refractory compounds depend on the content of impurities and dispersion (particle size). To solve a specific problem associated with the use of refractory compounds, it is important to choose the right method for their preparation, to determine the permissible content of impurities in the initial components. This leads to the existence of different methods for the synthesis of carbides. The main methods for their preparation are: synthesis from simple substances (metals and carbon), metallothermal and carbothermal reduction. Plasma-chemical synthesis (vapor-gas phase deposition) is also used to obtain carbide nanopowders. A characteristic is given to each of these methods. Information on the possible mechanism of the processes of carbothermal synthesis is presented.

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Section: осаждение из парогазовой фазыunclassified

Carbides of transition metals: Properties, application and production. Review. Part 2. Chromium and zirconium carbides

Krutskii,

Gudyma,

Krutskaya

et al. 2023

Izv. vysš. učebn. zaved., Čern. metall.

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“…Эти волокна обладают высокой прочностью, достаточно высоким модулем упругости, низким удельным весом, не теряют свою массу при высоких температурах, что позволяет использовать их во многих областях. В научно-технической литературе этому вопросу в последние десятилетия посвящено значительное количество работ [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. В то же время влияние некоторых физико-химических параметров на конечные свойства УВ недостаточно полно изучено.…”

Section: введение введениеunclassified

Investigation of the properties of high-strength fibers by methods of physico-chemical analysis

Cheblakova,

Kleusov,

Sapozhnikov

et al. 2023

Izv. VUZ. Poroshk. Met.

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The carbon fiber (CF) of UMT 49-12K-ER grade, manufactured by Alabuga-Volokno LLC (Umatex JSC), was the subject of an extensive study. This investigation encompassed an analysis of its physico-chemical properties. The interplanar dimensions and chemical composition of the CF were determined using X-ray diffraction and atomic emission spectroscopy. Surface properties of the CF, including specific surface area and pore size distribution, were investigated through nitrogen adsorption. The BET specific surface area was measured at 0.29 m2/g. The volume of mesopores and their size distribution were calculated using the Barrett, Joyner, and Halenda method. Additionally, an analysis of surface functional groups was conducted through a back titration method. It was observed that there was no presence of carboxyl, phenolic, or carbonyl groups. The diffraction patterns were processed with a two-component profile description model. The results of atomic emission spectral analysis revealed that silicon compounds were the dominant impurities in the chemical composition of the CF. Further investigations determined that, in an inert environment, the epoxy coupling agent used to enhance the performance properties of this CF undergoes thermal decomposition at temperatures of 300–400 °C. The CF itself does not experience weight loss when heated up to 950 °C. It was also discovered that this CF ignites in the presence of oxygen at temperatures exceeding 550 °C, surpassing the thresholds noted in previous publications for carbon fibers without such specialized additives. The results of this research have suggested new methodologies for studying carbon fibers.

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Magnetic Resonance Imaging Study of Water Absorption of Polymer Composite Materials Subjected to Mechanical and Temperature Impact

Morozov,

Il’ichev,

Bouznik

2023

Himičeskaâ fizika

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The results of a study of water absorption processes by samples of polymer composite materials(PCMs) based on fiberglass, subjected to low-speed impact with controlled impact energy and alternatingtemperature cycling are presented. Using magnetic resonance imaging (MRI), the distribution of absorbedwater in the fiberglass structure is visualized and the dynamics of its accumulation in various areas of the sampleare studied. It is found that mechanical impact leads to a nonuniform distribution of the absorbed waterin the samples and a significant accumulation of free water in the areas of destruction and adjacent layers inthe event of a violation of the integrity of the outer layer of the material. It is shown that cyclic alternatingtemperature effects do not lead to a noticeable change in the water absorption processes and are comparablein effect to mechanical nondestructive effects. The results obtained using MRI are in close agreement withthe data of traditional weight measurements, which shows the effectiveness of the method in diagnosingdefects and mechanical damage to PCMs exposed to the aquatic environment.

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Углеродные Волокна На Основе Пека: Состояние Производства И Модификация Свойств

Cited by 3 publications

References 0 publications

Carbides of transition metals: Properties, application and production. Review. Part 2. Chromium and zirconium carbides

Carbides of transition metals: Properties, application and production. Review. Part 2. Chromium and zirconium carbides

Investigation of the properties of high-strength fibers by methods of physico-chemical analysis

Magnetic Resonance Imaging Study of Water Absorption of Polymer Composite Materials Subjected to Mechanical and Temperature Impact

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