Refractory wash for producing mould coatings

Details Refractory wash for producing mould coatings Refractory wash for producing mould coatings

B - Operations, Transporting

22

C

B22C 3/00 (2006.01) C08K 7/24 (2006.01) C09D 5/18 (2006.01)

Patent

CA 2139871

A founder's black for producing mould coatings is disclosed, whose main component consists of finely ground refractory to highly refractory inorganic materials. The black wash contains 1 to 40 % by weight inorganic hollow spheres,in relation to the ready-to-use black wash. It may further contain 0.1 to 10 % by weight inorganic or organic fibres, in relation to the ready-to-use mould coating. The hollow spheres are preferably filled with an inert gas. They may consist of oxides suck as aluminium oxide, quartz, magnesite, mullite, chromite, zircon oxide and/or titanium oxide, of borides, carbides and nitrides such as silicium carbide, titanium carbide, of carbon, glass or metals, or mixtures thereof. The fibres have 1 to 30 µm diameter, preferably 3 to 10 µm and 10 to 5000 µm length, preferably 100 to 500 µm. When the fibres are inorganic, they may consist of aluminium silicates, aluminium oxide, zircon oxide, titanium oxide, carbon, silicium carbide, titanium carbide, titanium boride, boron nitride, boron carbide, glass, basalt or mineral wool, or mixtures thereof.

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