Cobalt Mass Transfer Through the Liquid Phase in Sintering of Sn-Cu-Co and Sn-Cu-Co-W Powder Materials

Sokolov, E. G.; Ozolin, A. V.; Svistun, L. I.

doi:10.17654/hm016020297

Cited by 5 publications

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“…Diffusion alloying in the medium of low-melting liquidmetal solutions (DALLS) is considered as the most prospective TCT technology [13,14]. This technology allows to obtain defect-free coatings with homogeneous structure on the components with complicated shape, which are fabricated from structural steels, cast irons, hard alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Bobylev,

Storozhenko

2023

cisisr

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The paper considered the effect of Ni-Cu-based coatings obtained by diffusion metallization from a medium of low-melting liquid metal solutions on corrosion resistance of structural steels. It was revealed that diffusion saturation of Ni-Cu steels U8, Kh12MF, 40Kh, steel 20 formed diffusion coatings with a thickness of 10-42 μm on their surface. Thickness of the coatings depended on the modes of diffusion saturation and the coated material. It was found out that corrosion resistance of the coated materials increases in the environment of 30 % aqueous HCl and 3 % NaCl solutions with rise of the diffusion saturation temperature. The maximum corrosion resistance was obtained after diffusion saturation at the temperature of 1070 °C. Ni-Cu-based coatings allow to reduce the corrosion rate of steels in the NaCl environment: for the steel U8 by 26.21 times, for the steel Kh12MF by 21.48 times, for the steel 40Kh by 18.46 times, for the steel steel 20 by 13.9 times. Corrosion rate of steels in HCl environment is also reduced: for the steel U8 by 20.23 times, for the steel Kh12MF by 20.06 times, for the steel 40Kh by 17.35 times, for the steel 20 by 11.45 times. It was revealed that chromium-alloyed steels are undergone additional alloying coating with chromium, diffusing from the coated sample, which allows to obtain a minimal corrosion rate in both HCl and NaCl environments. Thus, the corrosion rate of steel Kh12MF after Ni-Cu coating in NaCl was 0.025 g/(m 2 •h), in HCl -0.289 g/(m 2 •h). The highest corrosion rate was detected on the samples made of U8 steel: in NaCl 0.032 g/(m 2 •h), in HCl -0.039 g/(m 2 •h).

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Section: Introductionmentioning

confidence: 99%

Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Bobylev,

Storozhenko

2023

cisisr

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Effect of tungsten nanoparticles on sintering of the Sn-Cu-Co-W powder material

Ozolin

Sokolov

2021

J. Phys.: Conf. Ser.

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The effect of tungsten nanoparticles on the kinetics of sintering of the Sn-Cu-Co-W powder material used as a binder in diamond tools was studied. The W16,5 grade tungsten powder was mechanically activated in the AGO-2U planetary centrifugal mill for 60 minutes at the carrier rotation frequencies of 800 RPM. The mixture of tungsten, tin, copper, and cobalt powders was compacted by static pressing in press dies and then sintered in vacuum at the temperature of 820°C. The morphology and sizes of powder particles, as well as the structure of the sintered samples, were studied by the methods of scanning electronic microscopy. It has been demonstrated that tungsten nanoparticles have a noticeable effect on the process of dissolution-reprecipitation of cobalt in liquid-phase sintering.

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Effect of tungsten nanoparticles on interaction of Sn-Cu-Co metallic matrices with diamond

Ozolin

Sokolov

Golius

2021

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

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The effect of tungsten nanoparticles on interaction of sintered Sn-Cu-Co metallic matrices with diamond has been studied. Nanoparticles were obtained by grinding standard tungsten powder in a planetary-centrifugal mill. Commercially pure tin, copper, and cobalt powders were mixed with synthetic diamonds and the milled tungsten. Samples were shaped by static pressing in a mold and sintered in vacuum at 820°C. The sintered samples were subjected to static compression test, and hardness of the metallic matrices was measured. The structure of fractures and distribution of the elements over them were explored by the SEM and energy dispersive X-ray microanalysis methods. It has been determined that introducing tungsten nanoparticles into the composite material contributes to dispersion hardening of the metallic matrix and higher strength of its adhesion to diamond.

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Cobalt Mass Transfer Through the Liquid Phase in Sintering of Sn-Cu-Co and Sn-Cu-Co-W Powder Materials

Cited by 5 publications

References 0 publications

Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Effect of tungsten nanoparticles on sintering of the Sn-Cu-Co-W powder material

Effect of tungsten nanoparticles on interaction of Sn-Cu-Co metallic matrices with diamond

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