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[December 2003]
Aremco Markets New Ceramic Coating Formulas
Aremco Products Inc (Valley Cottage, NY, USA) has added to its portfolio of specialist ceramic compounds and coatings.
Ceramacoat (tm) 512N is a single part, water-based, silica filled adhesive and coating system used for both the assembly of ceramic, metal and plastic electrical components and the coating of high temperature structures that require corrosion protection. This system is designed to replace conventional organics which are limited to a maximum operating temperature of 260°C; 512N can be used in applications as high as 1316°C.
512N is said to provide exceptional electrical properties and also exhibit good moisture, oxidation and chemical resistance. It is applied by brushing or trowelling and cleans up prior to curing with warm water. It will cure at room temperature overnight or can be cured in an accelerated manner by heating for two to four hours at 93°C and 177°C respectively.
A second addition, Pyro-Paint (tm) 634-AS is an alumina-silica based, fibre reinforced ceramic coating system used to bond, coat and seal graphite and refractory materials used in molten metal fluid handling components and structures in foundry applications to 126°C. A new application is the insulation of graphite impellers used in the handling of molten aluminium; the 634-AS is said to prevent wear and oxidation of the graphite at the melt line.
The product is claimed to exhibit exceptional adhesion to graphite and ceramic cloth and fibreboard. It is resistant to wetting by non-ferrous molten metals, increasing the durability, erosion resistance and reliability of the underlying structure. 634-AS is formulated with a solids content of 61.2% by weight and 63.3% by volume to a viscosity range 400-700cps. It is typically applied by brush, roller or conventional spray equipment. Dry films from 2-3 mils up to 9mm can be produced without cracking.
It is described as a simple to use, environmentally friendly, water-based formulation containing no VOCs. It dries at room temperature in several hours and cures fully within 2 hours at 93°C. It is part of a range of refractory coatings based on ceramic fillers including boron nitride, carbon, graphite, yttria and zirconia.
www.aremco.com
ENDS