Investigation of WC-Co Electrospark Coatings with Various Carbon Contents

Бурков, А. А.; Pyachin, S. A.

doi:10.1007/s11665-014-0974-z

Cited by 21 publications

(16 citation statements)

References 29 publications

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“…Hardness and wear resistance of WC-Co coatings are strongly dependent on the degree of WC decarburization [22,26]. We used X-ray diffraction (XRD) that to detect the tungsten carbide transformations at EGD.…”

Section: X-ray Analysismentioning

confidence: 99%

“…Moreover, a nano-amorphous structure (M y C ) c a n f o r m i n t h e s e c o n d i t i o n s a n d c a n e x c e e d 7 0 % i n electrospark coatings [21]. Annealing of the coatings at a temperature of 1100 K caused the recrystallization of the amorphous phase to the crystalline structure and led to the carbonization of W 2 C to WC and M 6 C phases according to the scheme [25,26] W 2 C + M y C = WC + M 6 C…”

Section: X-ray Analysismentioning

confidence: 99%

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Formation of WC–Co coating by a novel technique of electrospark granules deposition

Бурков

Pyachin

2015

Materials & Design

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Section: X-ray Analysismentioning

confidence: 99%

Section: X-ray Analysismentioning

confidence: 99%

Formation of WC–Co coating by a novel technique of electrospark granules deposition

Бурков

Pyachin

2015

Materials & Design

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“…The kerosene that is suggested by the micro-EDM manufacturer is used as a dielectric liquid for the experiments [ 4] .To prevent the electrode material flowing with the liquid, circulation pump was closed. It will be beneficial to deposit electrode material.…”

Section: Introductionmentioning

confidence: 99%

Interface behavior of tungsten coating on stainless steel by electro spark deposition

Wang

2015

MATEC Web of Conferences

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Abstract:A new method of electro spark deposition method was put forward, which was based on the theory of electro spark deposition by changing the polarity in the liquid. Tungsten coating layers was produced on surface of Stainless Steel by electro spark deposition. The micro hardness, microstructure, chemical composition and phases of the coating layer were examined by means of hardness test, scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) analysis. The results showed that there was tungsten coating in the surface, which was discontinuous. Microhardness of the coating layer was about 3 times more than that of the substrate. The combination between coating layer and substrate was metallurgical bond. a Yuanggang Wang: wygang2000@163.com.

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“…С другой стороны, оксид алюминия иногда добавляют непосредственно в структуру покрытий, что также повышает жаростойкость и износостойкость поверхности титановых сплавов [9,10]. В данной работе мы сравнивали электроискровые (ЭИЛ) [11,12] покрытия из Ti 3 Al на титановом сплаве ВТ20 с нанесенным на поверхность алюминием и с покрытием Al+Al 2 O 3 , полученным с помощью составного электрода.…”

Section: Introductionunclassified

Improving oxidation resistance of titanium alloy VT20 by forming composite electrospark Ti3Al + Al/Al2O3 coatings

Бурков¹

2015

LoM

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Institute of Materials of Far Eastern Branch of the RAS, 153 Tikhookeanskaya St., 680042 Khabarovsk, Russia Ti3Al intermetallic coatings has been deposited onto titanium alloy VT20 by electrospark deposition method by combination titanium and aluminum electrodes. Synthesis of aluminide Ti 3 Al occurred in the liquid phase reaction of titanium and aluminum under the influence of low-voltage electrical discharges. In order to improve the oxidation resistance of the obtained composition the thin barrier layer of aluminum or aluminum oxide was deposited. Composite electrode as aluminum tube filled with fine powder Al 2 O 3 was used for electrospark deposition of alumina. The kinetics of the cathode weight gain was studied. Are shown X-ray diffraction data of obtained coatings. The layers thicknesses were from 30 to 70 microns. The coatings roughnesses (Ra) were within 2.2 -3.5 microns. The kinetics of isothermal oxidation of the obtained samples and uncoated alloy VT20 at 1073 K in air was studied. It was shown that the heat resistance of the coated sample based on Ti 3 Al is almost two times higher compared to the original alloy. Deposition of an additional barrier layer of alumina onto the Ti 3 Al coating resulted in lower of speed high temperature gas corrosion as compared to VT20 alloy almost four times. The XRD data of the samples after the corrosion resistance test showed that at the high temperature exposure the surface of the Ti 3 Alcoated sample of oxidized to alumina and rutile. The composition of the sample with an additional layer of Al 2 O 3 the products of titanium oxidation not been found, that demonstrating the excellent protective properties of the barrier layer deposited Институт материаловедения ХНЦ ДВО РАН, ул. Тихоокеанская 153, 680042 Хабаровск, Россия Путем комбинирования алюминиевого и титанового электродов, в процессе электроискровой обработки титанового сплава ВТ20, было получено покрытие на основе интерметаллида Ti 3 Al. Синтез алюминида Ti 3 Al протекал при жидкофазном взаимодействии титана и алюминия под воздействием низковольтных электрических разрядов. С целью повышения жаростойкости полученной композиции, дополнительно наносился тонкий барьерный слой из алюминия или оксида алюминия. Для электроискрового осаждения оксида алюминия применялся составной электрод в виде алюминиевой трубочки заполненной мелкодисперсным порошком Al 2 O 3 . Исследована кинетика привеса катода. Приведены данные рентгенофазового анализа полученных покрытий. Толщина слоев составляла от 30 до 70 мкм. Шероховатость покрытий по критерию Ra находилась в пределах 2,2 -3,5 мкм. Была изучена кинетика изотермического окисления полученных образцов и непокрытого сплава ВТ20 при температуре 1073 К в среде воздуха. Было показано, что жаростойкость образца с покрытием на основе Ti 3 Al почти в два раза выше по сравнению с исходным сплавом. Осаждение дополнительного барьерного слоя из окиси алюминия поверх покрытия на основе Ti 3 Al привело к снижению скорости высокотемпературной газовой коррозии сплава ВТ20 почти в четыре ...

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Investigation of WC-Co Electrospark Coatings with Various Carbon Contents

Cited by 21 publications

References 29 publications

Formation of WC–Co coating by a novel technique of electrospark granules deposition

Formation of WC–Co coating by a novel technique of electrospark granules deposition

Interface behavior of tungsten coating on stainless steel by electro spark deposition

Improving oxidation resistance of titanium alloy VT20 by forming composite electrospark Ti3Al + Al/Al2O3 coatings

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