COATING FOR PROTECTION OF ZIRCONIUM OF ALLOYS THEREOF FROM OXIDATION

• Main Authors: BOCHAROV O.V, SHISHKOV N.V, OGURTSOV A.N, ZAJTSEV V.L, LOSITSKIJ A.F
• Format: Patent
• Language: English; Russian
• Published: 27.11.2000
• Edition: 7
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MINERAL OR SLAG WOOL; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

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 alpha-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