HEAT-RESISTANT COVER Russian patent published in 2002 - IPC

FIELD: machine engineering. SUBSTANCE: invention relates to materials used for protection of heat-resistant alloys from destruction under effect of gaseous corrosion in the process of exploitation. The heat-resistant cover comprises the following components, wt.-%: SiO₂, 20.0-31.0; B₂O₃, 4.0-5.0; Al₂O₃, 10.0-12.0; CaO, 2.0-4.0; BaO, 4.0-6.0; MgO, 0.5-1.5; TiO₂. 1.5-2.5; Cr₂O₃, 15.0-17.0; mineral chelate compound based on SiO₂, 5.0-6.0; talc, 2.0-2.5; mica, 2.0-2.5; polymethylphenylsiloxane, 0.6-0.8; organosilicon resin, 10.5-14.5; toluene, 8.0-11.0. The mineral chelate compound based on SiO₂ has the following composition, 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. Invention provides decrease of temperature in cover formation to the room one, increased uniformity, thermal stability and heat resistance of cover at temperatures of exploitation above 1000 C. EFFECT: improved properties of cover. 3 tbl