CATALYTICALLY ACTIVE CERAMIC COATINGS

专利名称：CATALYTICALLY ACTIVE CERAMIC

COATINGS

发明人：GEORGE FRANCIS CARINI,ERNEST MAYER

HOMMEL,JAMES RAYMOND TWIGGER

申请号：AU4109672申请日：19720413公开号：AU4109672A公开日：19731018

摘要：1357062 Enamelling composition D HOMMEL CO 13 April 1972 [27 April 1971]17113/72 Heading C1M A coating material has a composition comprising 100 parts ofdevitrifiable base frit, 5-30 parts of barium-containing glass or glassforming compound,0-30 parts aluminium or aluminium alloy powder, 0-20 parts copper oxide and iron oxide,0-3 parts cerium oxide, and 0-30 parts of antimony oxide, the sum of the parts ofaluminium or aluminium alloy powder and the parts of antimony oxide being between 1and 30, all of the said parts being by weight, the balance, if any, consisting of compatibleingredients, the barium-containing glass or glass-forming compound having the followingpercentage composition by weight: 0-15% Na 2 O, 0-10% K 2 O, 0À1-10% Li 2 O, 0-5% Al 2O 3 , 15-58% B 2 O 3 , 0-35% SiO 2 , 0À1-12% F 2 , 0-21% CaO, 12-42% BaO, 0-4% ZnO and0-2% P 2 O 5 , the balance, if any, being impurities. The devitrifiable base frit maycomprise (a) alkali metal oxides, (b) silica, (c) alumina or MnO 2 and (d) other oxides andfluorides (F 2 , B 2 O 3 , TiO 2 , ZrO 2 , CaO, BaO, ZnO, Sb 2 O 3 , Fe 2 O 3 , P 2 O 5 ). Specificdevitrifiable base frits are disclosed. The coating material may also contain inorganicoxide pigments, e.g. cobalt oxide and nickel oxide; clay; colloidal silica; hydrated

magnesium silicate; sodium nitrite; potassium carbonate; and polysaccharide gum. Thematerial is used to provide catalytic coatings, e.g. in self-cleaning ovens. The catalyticallyactive coating material may be applied directly to the substrate, which may be ferrous orceramic in nature, without a ground coat. Ferrous metal surfaces may be cleaned bysandblasting or boiling prior to enamelling. A slip of the coating material in water isapplied to the substrate by spraying, dipping or flow coating. The thickness may be 4-20mils. The coated surface is fired at 1400-1550‹ F., and more than one enamelling coat maybe applied to the substrate.

申请人：HOMMEL, O., CO., THE

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