HEAT-RESISTANT COATING Russian patent published in 2009 - IPC C03C8/14 

FIELD: chemistry.

SUBSTANCE: present invention pertains to heat-resistant coatings for protecting component parts of gas-turbine engines (combustion chamber, flue tubes, gas tubes etc.) made from heat-resistant alloys from high-temperature gas corrosion during operation at 1200°C temperature. The heat-resistant coating contains SiO₂, B₂O₃, Al₂O₃, BaO, CaO, MgO, TiO₂, Cr₂O₃, mineral complex compound based on SiO₂, SiB₄ and ZrO2 at the following ratios of components, wt %: SiO₂ -21.0-36.6; B₂O₃ - 5.0-6.7; Al₂O₃ - 34.0-40.0; BaO - 6.3-7.0; CaO - 4.0-5.0; MgO - 0.9-2.0; TiO₂ - 0.5-0.9; Cr₂O₃ - 3.5-5.0; SiB₄ - 0.2-0.4; ZrO₂ - 5.0-7.0; mineral complex compound based on SiO₂- 4.0-5.0. The mineral complex compound based on SiO2 contains the following components in wt %: SiO₂ - 56.25-58.05; Al₂O₃ - 34.3-35.1; CaO - 1.0-1.2; MgO - 1.0-1.1; K₂O - 2.5-2.6; Na₂O - 0.6-0.7; TiO₂ - 1.6-1.8; SO₃ - 0.15-0.25; Fe₂O₃ - 0.8-1.0 or SiO₂ - 35.25-40.05; Al₂O₃ - 34.3-35.1; CaO - 1.0-1.2; MgO - 1.0-1.1; K₂O - 2.5-2.6; Na₂O - 0.6-0.7; TiO₂ - 1.6-1.8; SO₃ - 0.15-0.25; Fe₂O₃ - 0.8-1.0; SiB₄ - 18.0-21.0.

EFFECT: increased temperature stability, heat resistance, adhesion strength of the coating.

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