Diffusion Saturation by Titanium from Liquid-Metal Media as Way to Increase Carbide-Tipped Tool Life

Sokolov, A. G.; Bobylyov, E. E.

doi:10.4028/www.scientific.net/ssp.265.181

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Выбор режима предварительной цементации существенно влияет на твердость, и, как следствие, на стойкость режущего твердосплавного инструмента, имеющего титановое покрытие [2,3]. Было установлено, что основным параметром, влияющим на количество углерода, получаемого при цементации, является температура процесса.…”

Section: результаты и обсуждениеunclassified

“…При этом покрытия на основе карбидов титана одни из наиболее распространенных благодаря их высокой микротвердости, износостойкости и распространенности титана. При этом, одной из перспективных технологий нанесения покрытий представляется диффузионное титанирование в среде легкоплавких жидкометаллических расплавов [1][2][3][4]. Для формирования покрытий из карбида титана могут использоваться технологии CVD, PVD, ХТО.…”

Section: Introductionunclassified

“…Технология диффузионной металлизации в среде легкоплавких жидкометаллических растворов обладает мировой новизной и в настоящее время применяется исключительно в РФ. Преимущества данной технологии по сравнению с PVD и CVD: высокая совместимость покрытия с покрываемым материалом, возможность покрывать изделия любой формы, простота оборудования, возможность получения многокомпонентных покрытий [1][2][3][4][5][6][7].…”

Section: Introductionunclassified

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Influence of carburization on the structure and properties of functional diffusion coatings based on titanium carbide on TiC-WC-Co and WC-Co alloys

2020

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The technology of applying diffusion titanium coatings from the medium of low-melting liquid-metal melts to hard alloys of the TiC-WC-Co and WC-Co types is described. It is shown that in the case of diffusion saturation of the surface layers of a hard alloy tool of the TiC-WC-Co and WC-Co types with titanium from the Pb-Bi-Li-Ti melt, preliminary carburization is an obligatory stage in the process of coating formation, and allows avoiding the formation of a decarburized zone under the diffusion layer. The effect of preliminary carburization on the phase composition of the coated hard alloy is shown. As a result of the phase analysis, it was revealed that the surface layer contains such phases as WC, TiC, Co 2 C, Co-C. In this case, titanium carbide TiC is formed due to the destruction of cobalt carbide upon further diffusion saturation with titanium. In the absence of carburization, the formation of a decarbidized layer was revealed, which differs from the coating and the base in lower microhardness, the drop in microhardness is about 1000 MPa. After carburization, there was a slight increase in the hardness of the coated parts from 89 to 91 HRA. Characteristics such as the microhardness of the carburization zone and its length depend on the temperature and duration of the preliminary carburization, as well as on the elemental composition of the material to be coated. Carburization was carried out in the temperature range from 950°C to 1150°C from 30 to 120 minutes. After saturation with carbon, the thickness of the carburization zone was from 2 to 25 μm, the microhardness from 16700 to 17150 MPa for the WC-Co alloy and from 18750 to 19200 MPa for the TiC-WC-Co alloy. The hardness of the layer under the coating ranged from 27000 to 28500 MPa for the TiC-WC-Co alloy and from 19300 to 23500 MPa for the WC-Co-type alloy.

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Section: результаты и обсуждениеunclassified

Section: Introductionunclassified

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Influence of carburization on the structure and properties of functional diffusion coatings based on titanium carbide on TiC-WC-Co and WC-Co alloys

2020

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“…To control the properties of the surface layer of machine parts and mechanisms, various approaches are used that involve changing the elemental composition of the surface layer by ion implantation [1,2], ion mixing [3], and diffusion of alloying elements from gaseous [4,5], liquid [6,7] or solid [8,9] states. Complex alloying is also widely used, such as alloying of steels with metal atoms for further (or simultaneous) saturation of the surface layer with non-metallic atoms (nitrogen, carbon, boron) [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Mathematical Modeling of the Processes Occurring in ZrN Coating/Silumin Substrate Systems under Pulsed Electron Beam Irradiation

Koval

Крысина

et al. 2021

Coatings

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This paper presents a study of a combined modification of silumin, which included deposition of a ZrN coating on a silumin substrate and subsequent treatment of the coating/substrate system with a submillisecond pulsed electron beam. The local temperature on the samples in the electron-beam-affected zone and the thickness of the melt zone were measured experimentally and calculated using a theoretical model. The Stefan problem was solved numerically for the fast heating of bare and ZrN-coated silumin under intense electron beam irradiation. Time variations of the temperature field, the position of the crystallization front, and the speed of the front movement have been calculated. It was found that when the coating thickness was increased from 0.5 to 2 μm, the surface temperature of the samples increased from 760 to 1070 °C, the rise rate of the surface temperature increased from 6 × 107 to 9 × 107 K/s, and the melt depth was no more than 57 μm. The speed of the melt front during the pulse was 3 × 105 µm/s. Good agreement was observed between the experimental and theoretical values of the temperature characteristics and melt zone thickness.

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Elemental composition and properties of the diffusion functional TiC Ni-Cu coating on cutting tools made of hard alloys WC-TiC-Co and WC-Co

Bobylyov¹,

Storozhenko²

2021

AIP Conference Proceedings

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Diffusion Saturation by Titanium from Liquid-Metal Media as Way to Increase Carbide-Tipped Tool Life

Cited by 7 publications

References 2 publications

Influence of carburization on the structure and properties of functional diffusion coatings based on titanium carbide on TiC-WC-Co and WC-Co alloys

Influence of carburization on the structure and properties of functional diffusion coatings based on titanium carbide on TiC-WC-Co and WC-Co alloys

Experimental Study and Mathematical Modeling of the Processes Occurring in ZrN Coating/Silumin Substrate Systems under Pulsed Electron Beam Irradiation

Elemental composition and properties of the diffusion functional TiC Ni-Cu coating on cutting tools made of hard alloys WC-TiC-Co and WC-Co

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