CARBON TILES WITH REFRACTORY COATING FOR USE AT ELEVATED TEMPERATURE

摘要

A method of bonding a protective coating on a wear-exposed surface of a carb on tile comprises: applying onto the wear-exposed surface of the carbon tile at least one layer of a slurry of particulate refractory material suspended in a colloidal and/or inorganic polymeric carrier comprising a dispersion of colloidal particles and/or a solution of inorganic polymeric particles of binding metal oxide; and heat treating the slurry-applied layer(s) to consolidate the particulate refractory material in the binding metal oxide t o form the protective coating. A hydrophobic carbon compound having a hydrophilic substituent, such as -OH, -SO3Na or -COOH, is used in the slurry as a bonding agent that bonds the binding metal oxide to the carbon tile by being bonded to the wear-exposed surface of the carbon tile and by having it s hydrophilic substituent bonded to the binding metal oxide. Preferably, the protective coating comprises on the layer(s) containing the hydrophobic carb on compound one or more layers of refractory material which are substantially free of any elemental carbon or organic carbon compound.