Refractory foam
OwnerCressie E. Holcombe, Patrick J. Ritt +1inventors
InventorsCressie E. Holcombe, Patrick J. Ritt, William Brent Webb
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Abstract
A porous refractory in the K2O—SiO2—B2O3 system is formed by chemical direct foaming by heating to over 600° C., resulting in adherent black or white foam. The foam can function as highly porous thermal insulation, a high or low thermal emissivity surface, as a sealant for deteriorated refractory surfaces, as a filler for pockmarks/holes/gaps or as a bonding agent for parts with large gaps between them.
Claims9
A process for forming a porous refractory coating on a ceramic or metal surface, or for repairing a refractory surface or for bonding to a refractory, ceramic, or metal surface of a part, by chemical direct foaming comprising the steps of:
- applying to said surface an aqueous composition of 2 to 30 weight percent K2O;
- 10 to 74 weight percent SiO2 and between 23 to 79 weight percent B2O3;
- heating said composition to a temperature above 600° C., thus causing said composition to foam and produce a highly porous thermally-insulating layer.
Dependencies are inferred from the claim text.