| 摘要 |
1,214,261. Enamel frits. FERRO CORP. 6 Feb., 1969 [22 March, 1968], No. 6463/69. Heading ClM. A porcelain enamel frit comprises from more than 12 to 70 weight per cent (in total) of at least one oxide selected from the oxides of Co, Mn, Cu and Cr, with the proviso that, when any Cr is present, there is also present at least one oxide selected from Co, Mn and Cu oxides, the oxides having been melted into and homogeneously dispersed throughout the frit. The frits are particularly, useful on oven-liners for self-cleaning ovens, as these oxides act as oxidation-inducing agents. They may also be used in exhaust systems for paint baking ovens and for automobiles to oxidize noxious compounds. Typical frits (of which examples are given) fall within the following ranges in weight percentages: 5i0 2 10-60; B 2 O 3 0-30; BaO 0-20; CaO 0-30; Li 2 O 0-15; K 2 0 0-20; Na 2 O 0-20; P 2 0 5 0-20; F 2 0-10; 8b 2 0 5 0-30; TiO 2 0-30; ZnO 0-20 with oxidation oxides Co, Mn, Cu, Cr > 12-70. The frit is mixed with small amounts of mill additions, water and possibly alumina and sprayed on to a prepared substrate and fired at below 1600‹ F., in examples 1400-1450‹ F. |
