Wear properties of CrC–37WC–18M coatings deposited by HVOF and HVAF spraying processes

Hulka, Iosif; Şerban, Viorel Aurel; Secoşan, I.; Vuoristo, Petri; Niemi, Kari

doi:10.1016/j.surfcoat.2012.07.077

Cited by 45 publications

(19 citation statements)

References 8 publications

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“…Elements mapping (Figs. [1][2][3][4][5][6][7][8] revealed, that Ti is quite homogenously distributed within the Co matrix, even when it is not observed in the SE image. During the sintering process, nano-sized TiC particles do not tend to agglomerate.…”

Section: Resultsmentioning

confidence: 99%

“…Due to high velocity, short time of interaction between the powder and the flame and in conjunction with process temperature, which limits thermal alteration should ensure good cohesion, low porosity and low decarburization [4,6]. Other process applied as an alternative to HVOF process, is the high velocity air fuel (HVAF) process, where instead of oxygen, compressed air is used for combustion.…”

Section: Introductionmentioning

confidence: 99%

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WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

Myalska¹,

Dybowski²,

Moskal³

2017

Adv. Sci. Technol. Res. J.

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The different concepts of WC-Co thermally sprayed coatings improvement may be considered and the application of nanoparticles, as the mechanical strengthening addition, is one of them. Nanostructured WC-Co coatings are characterized by higher hardness than the coatings formed from micrometric WC grains; whereas coatings with bimodal distribution of particles reveal greater wear resistance than the coatings obtained exclusively from nano-sized powders. Mixed effect of the matrix reinforcement by nanoparticles and strong fix of the micron-sized WC grains was proposed as a possible reason for enhanced wear resistance of bimodal coatings. In order to obtain a bimodal distribution of particles in the material standard WC-Co (83-17) powder was mixed with nanometric TiC powder (40-100 nm). The amount of TiC in powder mixtures was in the range from 1 to 7 wt.%. The mixtures were deposited on steel substrate using HVAF method and also hot pressed in vacuum. The microstructure of obtained coatings and sinters was quantitatively evaluated. Sinters revealed more homogenous distribution of the nano-sized TiC particles than the coatings. The addition of nano-sized TiC in the case of coatings has led to the decrease of its porosity. The agglomeration of nano-sized TiC particles in the coatings results in the decrease of material's hardness.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

Myalska¹,

Dybowski²,

Moskal³

2017

Adv. Sci. Technol. Res. J.

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“…Recently, a powder of a similar composition of another manufacturer entered the market [22]. But so far, feedstock powders and coatings were only rarely topic of investigations [4,5,20,21]. Figure 4a shows the cross section of a 45Cr3C2-37WC-18NiCo powder particle and Figure 4b the cross section of a coating, sprayed with a liquid-fueled HVOF process (K2) [4].…”

Section: Cr3c2-37wc-18nicomentioning

confidence: 99%

Binary WC- and Cr₃C₂-containing hardmetal compositions for thermally sprayed coatings

Berger

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.Compositions of thermally sprayed hardmetal coatings for wear protection are based on the hard materials WC and Cr3C2 with Co and Ni as the most important binders, which are often alloyed with Cr. There are a few commercial compositions containing WC and Cr3C2 together, which have a high potential for the improvement of coating properties, in particular for service in corrosive environments and high temperature applications. However, the combined application of WC and Cr3C2 in the coating compositions leads to very complex reactions between these components both during feedstock powder preparation and the spray process. This contribution summarizes the knowledge about the interactions of WC and Cr3C2 for the most important commercially available compositions: WC-10Co-4Cr, WC-20'CrC'-7Ni, 45Cr3C2-37WC-18NiCo. These three compositions show remarkable differences of the interaction between WC and Cr3C2 and the coating properties.

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“…А напыление с более низкой температурой пламени и более высокой скоростью частиц порошка позволяет HVAF стать альтернативой методу HVOF [15]. Высокая скорость напыляемых частиц (≈1000 м/с) для HVAF позволяет получить плотные покрытия с низкой пористостью [16,17]. Существует ряд материалов покрытий, которые могут быть успешно нанесены методом HVAF термического напыления и быть использованы для различного применения.…”

Section: Introductionunclassified

CAVITATION EROSION-CORROSION RESISTANCE OF WC–CoCr AND WC–NiCr HVAF COATINGS

2019

PNIPU Bulletin.

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Для нанесения металлокерамических покрытий WC-CoCr и WC-NiCr на стальную основу использовался метод сверхзвукового газовоздушного напыления-HVAF. Целью настоящего исследования являлось сравнение значений сопротивления представленных покрытий коррозионно-кавитационному воздействию методом ультразвуковых колебаний в жидкой среде с приложением постоянного напряжения 12 В. Для оценки исходной шероховатости рабочей поверхности образцов из материала подложки и покрытий перед испытанием использовали оптическую 3D-профилометрию. С целью изучения микрорельефа поверхности покрытий после испытания использовали сканирующую электронную микроскопию. Результаты испытаний на кавитационную стойкость покрытия WC-NiCr показали приблизительно на 20 % лучшее сопротивление кавитационному изнашиванию по сравнению с покрытием WC-CoCr в данных условиях. Общие потери массы для WC-NiCr-покрытия достигали 0,66 % от исходной массы образца, в то время как для WC-CoCr-покрытия составили около 0,82 %. Сканирующая электронная микроскопия испытанных образцов показала наличие более выраженного рельефа и относительно крупных пор кавитационного происхождения на поверхности WC-CoCr-покрытия по сравнению с WC-NiCr. Таким образом, метод высокоскоростного термического напыления HVAF может использоваться в качестве эффективного метода нанесения металлокерамических коррозионно-стойких покрытий для защиты деталей из конструкционных материалов, так как позволяет повысить сопротивление кавитационному эрозионно-коррозионному износу. Так, по сравнению с материалом подложки (сталь 40) стойкость к кавитации повысилась в 2,3 и 1,8 раза для WC-NiCr-и WC-CoCr-покрытий соответственно. Ключевые слова: кавитационное испытание, эрозионно-коррозионное кавитационное воздействие, HVAF, термическое напыление, металлокерамические покрытия, WC-CoCr, WC-NiCr, топография поверхности.

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Wear properties of CrC–37WC–18M coatings deposited by HVOF and HVAF spraying processes

Cited by 45 publications

References 8 publications

WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

Binary WC- and Cr₃C₂-containing hardmetal compositions for thermally sprayed coatings

CAVITATION EROSION-CORROSION RESISTANCE OF WC–CoCr AND WC–NiCr HVAF COATINGS

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Wear properties of CrC–37WC–18M coatings deposited by HVOF and HVAF spraying processes

Cited by 45 publications

References 8 publications

WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

Binary WC- and Cr3C2-containing hardmetal compositions for thermally sprayed coatings

CAVITATION EROSION-CORROSION RESISTANCE OF WC–CoCr AND WC–NiCr HVAF COATINGS

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Product

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Binary WC- and Cr₃C₂-containing hardmetal compositions for thermally sprayed coatings