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Diffusion Hardening of Sintered Ceramic W–Co Materials by Simultaneous Diffusion Saturation with Boron, Chromium, and Titanium

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Abstract

Diffusion boronizing, as a method of thermochemical treatment, significantly improves the wear resistance and corrosion resistance of hardened products. The main disadvantage of boride coatings, which limits their application, is high fragility. This problem can be solved by applying multicomponent boron–based coatings using boron chromizing, boron titanizing, and boron–chromium–titanizing. Samples of sintered VK8 W–Co ceramics 12 mm in diameter and 10 mm in length were coated by a titanium daub (titanium powder with a particle size of 40 µm diluted in ethyl silicate). Simultaneous diffusion saturation with boron, chromium, and titanium was carried out in a chamber furnace equipped with a PID controller from a self-shielding powder. The temperature and time of saturation were equal to 1050°С and 1.5 h, respectively. After saturation, the samples were removed from the container and subjected to oil quenching starting directly from the saturation temperature. The hardness of the basic material on VK8 samples was 1740 ± 180 HV0.1. The maximal microhardness of diffusion coatings, 4600 HV0.1, was observed on samples precoated by a titanium daub and subjected to simultaneous saturation with boron, chromium, and titanium. For coatings obtained by simultaneous boron–chromium–titanium saturation without precoating, the maximal microhardness did not exceed 3500 HV0.1. The thickness of the diffusion layer on samples hardened using precoating by the titanium daub was 10 µm, and that of the diffusion coating simultaneously saturated wirth boron, chromium, and titanium was 12 µm. According to production test data for cast steel milling, the durability of removable titanium-daub-precoated VK8 cutting plates hardened by the simultaneous diffusion of boron, chromium, and titanium turned out to be 3.2–3.5 times higher than that of unhardened cutting plates and 1.5 times higher than the durability of cutting plates simultaneously saturated with boron, chromium, and titanium without titanium daub.

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ACKNOWLEDGEMENTS

The study was carried out in the Center for Collective Use at the Polzunov Sate Technical University.

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Authors and Affiliations

  1. Polzunov State Technical University, 656038, Barnaul, Russia

    A. M. Gur’ev, M. A. Gur’ev, S. G. Ivanov & E. V. Chernykh

  2. Wuhan Textile University, 430073, Wuhan, People’s Republic of China

    A. M. Gur’ev

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  1. A. M. Gur’ev
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  2. M. A. Gur’ev
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  3. S. G. Ivanov
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  4. E. V. Chernykh
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Correspondence to A. M. Gur’ev.

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Translated by V. Isaakyan

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Gur’ev, A.M., Gur’ev, M.A., Ivanov, S.G. et al. Diffusion Hardening of Sintered Ceramic W–Co Materials by Simultaneous Diffusion Saturation with Boron, Chromium, and Titanium. Tech. Phys. 67, 692–695 (2022). https://doi.org/10.1134/S1063784222100024

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  • DOI: https://doi.org/10.1134/S1063784222100024

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