METHOD OF PRODUCING HEAT-RESISTANT GLASS-CERAMIC COATING Russian patent published in 2019 - IPC C03C8/14 

FIELD: technological processes.

SUBSTANCE: invention relates to a technology for producing heat-resistant coatings to protect against high-temperature oxidation and erosion of products made from steels and high-temperature alloys based on and nickel. Coating is made double-layered. Precoat layer with a thickness of 30–40 mcm is applied from the slip with composition, wt. %: frit – 100, clay material – 4÷6, water – 45÷50 and burned at a temperature of 1,120–1,140 °C, and coating layer with a thickness of 60–70 mcm is from a slip, which is further introduced mill additives Al₂O₃ and Cr₂O₃ at the following ratio, wt. %: frit – 100, clay material – 4÷6, water – 50÷55, Al₂O₃ – 15÷30, Cr₂O₃ – 0÷15, with the sum of Al₂O₃+Cr₂O₃ equals to 15÷30, and burned at a temperature of 1,160–1,180 °C. To prepare frits use a composition comprising, by wt. %: TiO₂ – 2÷5, Al₂O₃ – 0.5÷2.5, Cr₂O₃ – 20÷25, CaO – 3÷5, BaO – 29÷35, MnO – 1÷2, CoO – 1÷3, MoO₃ – 1÷4, anoxic silicon compound (SiC or SiB₄) – 5÷10, SiO₂ – the rest, and the amount of CaO + BaO is 34÷38, cooking is carried out at a temperature of 1,550–1,600 °C for 2–1.5 hours.

EFFECT: increased temperature resistance and resistance to erosion of coatings in high-speed high-enthalpy fluxes of oxygen-containing gases, providing short-term performance of protected materials at temperatures up to 1,350 °C while maintaining the possibility of their long-term operation at temperatures up to 1,000 °C.

3 cl, 3 dwg, 4 tbl