| abstract |
The invention relates to a composition for protection from scale and as a lubricant for the hot processing of metals, consisting of a mixture of finely pulverulent materials, wherein the mixture contains at least the following constituents: (a) 0 to 15% by weight secondary or tertiary calcium phosphate compound, hydroxyl apatite or a mixture thereof, (b) 0.1 to 35% by weight of fatty acid, fatty acid salt or a mixture thereof, (c) 1 to 90% by weight ground boron silicate glass, which contains Na, B, Si and Al in the following weight fractions, expressed by their respective oxides, in relation to the boron silicate glass: 1 to 30% by weight Na 2 O, 2 to 70% by weight B 2 O 3 , 10 to 70% by weight SiO 2 and 0 to 10% by weight Al 2 O 3 , (d) 9 to 85% by weight condensed alkali phosphates, (e) boric acid, boric acid salt or a mixture thereof in an amount corresponding to a boron content, expressed by the oxide, of 0 to 3.2% by weight B 2 O3, (f) 0 to 10% by weight graphite, the mixture having an average particle size D50 of ≤ 300 µm. |