The development of a technological coating for a heat-resistant nickel alloy with a ZhS30 single-crystal structure that is protective against oxidation during high-temperature homogenization is examined. Based on the characteristics of the alloys, coatings were synthesized along the following lines: modification of known coatings in the CaO – BaO – SiO2 system by introduction of refractory fillers and organosilicon materials; investigation of bilayer coatings; and, synthesis of refractory frits in different silicate systems. The best properties of ZhS30 alloy were obtained by means of a coating based on a synthesized refractory frit containing the oxides SiO2, B2O3, BaO, and ZrO2. A protective effect of high efficacy obtains in the coating via the chemical composition of the frit, which effects the formation of [BO4] structural groups that participate in the construction of glass lattice. Zirconium ions are also involved in the construction of the structure and, together with silicon and boron ions, form a single boron-zirconium-silicon-oxygen framework with a high degree of polymerization. It was found that the frit’s liquation structure consists of two glass phases: the more fusible matrix contains drop-like inhomogeneities enriched in SiO2 that is distributed in it, which explains the resistance and stability of the glass at operating temperatures.
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Translated from Steklo i Keramika, No. 9, pp. 44 – 54, September, 2022.
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Vlasova, O.V., Denisova, V.S., Zakalashnyi, A.V. et al. ZrO2–BaO–B2O3–SiO2 Protective Technological Coating for Protecting High-Temperature Single-Crystal Nickel Alloys During Heat Treatment. Glass Ceram 79, 378–385 (2023). https://doi.org/10.1007/s10717-023-00517-5
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DOI: https://doi.org/10.1007/s10717-023-00517-5