Method of applying an oxide coating to a metal tube
First Claim
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2. A METHOD OF MAKING AN INSULATED METAL TUBE HAVING A VERY LOW HYDROGEN DIFFUSITION RATE FROM A TUBE OF BARE METAL HAVING A SUBSTANTIAL AMOUNT OF NICKEL THEREIN, COMPRISING, PASSING HYDROGEN GAS INTO SAID BARE METAL TUBE UNDER PRESSURE ENOUGH GREATER THAN ATMOSPHERIC TO CAUSE PASSAGE OF HYDROGEN THROUGH THE TUBE WALLS WHILE HEATING SAID TUBE WALLS IN AN OXYGEN CONTAINING ATMOSPHERE AT A TEMPERATURE SUFFICIENT TO CAUSE OXIDATION, AND SUBSEQUENTLY FUSING THERETO A CERAMIC COATING.
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2 Claims
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2. A METHOD OF MAKING AN INSULATED METAL TUBE HAVING A VERY LOW HYDROGEN DIFFUSITION RATE FROM A TUBE OF BARE METAL HAVING A SUBSTANTIAL AMOUNT OF NICKEL THEREIN, COMPRISING, PASSING HYDROGEN GAS INTO SAID BARE METAL TUBE UNDER PRESSURE ENOUGH GREATER THAN ATMOSPHERIC TO CAUSE PASSAGE OF HYDROGEN THROUGH THE TUBE WALLS WHILE HEATING SAID TUBE WALLS IN AN OXYGEN CONTAINING ATMOSPHERE AT A TEMPERATURE SUFFICIENT TO CAUSE OXIDATION, AND SUBSEQUENTLY FUSING THERETO A CERAMIC COATING.
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Current AssigneeJohn E. Lindberg
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Original AssigneeJohn E. Lindberg
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InventorsLindberg, John E.
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Application NumberUS04/189,433Time in Patent Office988 DaysField of SearchUS Class Current148/276CPC Class CodesC23C 8/12 using elemental oxygen or o...C23D 3/00 Chemical treatment of the m...
