COATING FOR PROTECTION OF ZIRCONIUM OF ALLOYS THEREOF FROM OXIDATION Russian patent published in 2000 - IPC

FIELD: inorganic coatings on metal, more particularly zirconium and its alloys from oxidation. SUBSTANCE: coating comprises high-melting sublayer and covering layer. High-melting sublayer comprises one compound from group consisting of α-Al₂O₃,SiO₂,3Al₂O₃•2SiO₂,ZrSiO₄, and covering layer comprises oxides, ratios of components being as follows, wt %: Al₂O₃, 3-7, CaO, 5-12; SrO, 5-11; MgO, 0.5-2.5; Na₂O, 9-15; K₂O, 5-10; Li₂O, 0-2; TiO₂, 0.5-2; at least one of group consisting of FeO, CoO, MnO, Cr₂O₃, 2-4; and SiO₂, the balance. EFFECT: safe protection effect of coating at temperatures ranging from 850 to 1000 C, no scale on surfaces of parts from zirconium or alloys thereof, no chemical interaction of composition components with zirconium and complete self-removal of coating from parts as they are hardened in water. 2 cl