Development of Heat-Resistant Coatings for Protection of Niobium and Tantalum from the Oxidizing Effect of Air at Temperatures 1700

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Development of Heat-Resistant Coatings for Protection of Niobium and Tantalum from the Oxidizing Effect of Air at Temperatures 1700–1900°C

S. G. Rudenkyi, V. I. Zmii, R. V. Kryvoshapka, M. F. Kartsev, O. O. Kornieiev, O. V. Kunchenko, Y. V. Kunchenko, T. P. Ryzhova, I. А. Liashenko, M. Y. Bredikhin

Национальный научный центр «Харьковский физико-технический институт» НАН Украины, ул. Академическая, 1, 61108 Харьков, Украина

Получена: 13.11.2023; окончательный вариант - 15.12.2023. Скачать: PDF

The paper presents the results of creating protective coatings on niobium and tantalum samples. These coated samples are tested for heat resistance in air in the temperature range of 1700–1900°C. The coating is formed by the method of activated vacuum diffusion saturation at temperatures of 1150–1310°C. When forming a part of the protective coatings, a layer of slurry is applied to the surface of the samples, followed by chemical and thermal treatment in a vacuum in the presence of NaCl vapours. A thermodynamic analysis of possible chemical reactions taking place in the process of formation of protective coatings is carried out. The developed heat-resistant coatings provide protection of niobium samples from air oxidation at a temperature of 1700°C from 8 to 13.5 hours. Heat-resistant coatings created on samples with Nb and Ta protect them from exposure to an oxidizing environment from 3 to 6.3 hours at a temperature of 1800°C and for 0.5 hours at a temperature of 1900°C.

Ключевые слова: protective layer, activated vacuum diffusion saturation, solid non-porous coatings, refractory metals, heat-resistant.

URL: https://mfint.imp.kiev.ua/ru/abstract/v46/i05/0479.html

PACS: 68.37.-d, 68.60.Dv, 81.15.-z, 81.65.Kn, 81.65.Mq, 82.30.-b, 82.33.Pt

ЦИТИРОВАННАЯ ЛИТЕРАТУРА

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