Patent ID: 6596120
Filing Date: 2003-07-22
Classification: C04B,F16L,Y10T

Abstract:
A method of making refractory lined ducts having an elongated, structurally supporting tube and a liner carried on an interior wall of the duct comprising:a) forming a sleeve on a structurally supportive die in a hydrated state by vacuum-forming wherein said sleeve has an external wall of a configuration that is geometrically and dimensionally complemental to the interior wall of the supporting tube to form an interference fit therewith effective in mechanically retaining said sleeve and tube in fixed interengagement; b) inserting the sleeve, while in a hydrated state and on the die, coaxially into the supporting tube and after insertion, removing the die from the sleeve; and c) drying the sleeve while said sleeve is maintained in fixed position within the supporting tube to remove substantially all liquid resulting in solidification of the sleeve in a frictionally and adhesively retained relationship with the supporting tube; wherein said method further comprises treating said sleeve with a coating, wherein said coating comprises a mixture of: silicon dioxide powder; collodial silicon dioxide; water; and an emissivity agent.