Method of heat treatment
First Claim
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1. IN THE HEAT TREATING OF STACKS OF LAMINATIONS COMPOSED OF ALUMINUM-IRON ALLOYS AND IRON OXIDE IN THE FORM OF MILL SCALE TO PRODUCE DESIRABLE MAGNETIC PROPERTIES, INCLUDING HEATING SAID STACKS UNDER AN AXIAL LOAD IN A SUBSTANTIALLY DRY HYDROGEN ATMOSPHERE AT TEMPERATURES IN EXCESS OF 1812*F., THE IMPROVEMENT WHICH COMPRISES A METHOD OF PRODUCING AN INSULATING FILM OF ALUMINUM OXIDE ON THE SURFACES OF SAID LAMINATIONS TO PREVENT INTERLAMINATION WELDING, SAID METHOD INCLUDING:
- (1) SIMULTANEOUSLY REDUCING THE IRON OXIDES AND OXIDIZING THE ALUMINUM IN SAID LAMINATIONS BY HEATING IN AN ESSENTIALLY DRY HYROGEN ATMOSPHERE HAVING A DEW POINT OF NOT GREATER THAN APPROXIMATELY -35* F. UNTIL A TEMPERATURE OF APPROXIMATELY 1400*F. IS REACHED;
(2) RAISING THE MOISTURE CONTENT OF SAID HYDROGEN ATMOSPHERE TO THE EQUIVALENT OF A DEW POINT OF GREATER THAN APPROXIMATELY +55*F. AND CONTINUING SAID HEATING AT 1400*F. FOR APPROXIMATELY ONE HOUR TO PRODUCE A FILM OF ALUMINIUM OXIDE CONTIGUOUS WITH THE SURFACES OF SAID LAMINATIONS;
AND (3) REDUCING THE MOISTURE CONTENT OF SAID HYDROGEN ATMOSPHERE AND ALLOWING SAID LAMINATIONS TO COOL TO BELOW APPROXIMATELY 300*F.
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1 Claim
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1. IN THE HEAT TREATING OF STACKS OF LAMINATIONS COMPOSED OF ALUMINUM-IRON ALLOYS AND IRON OXIDE IN THE FORM OF MILL SCALE TO PRODUCE DESIRABLE MAGNETIC PROPERTIES, INCLUDING HEATING SAID STACKS UNDER AN AXIAL LOAD IN A SUBSTANTIALLY DRY HYDROGEN ATMOSPHERE AT TEMPERATURES IN EXCESS OF 1812*F., THE IMPROVEMENT WHICH COMPRISES A METHOD OF PRODUCING AN INSULATING FILM OF ALUMINUM OXIDE ON THE SURFACES OF SAID LAMINATIONS TO PREVENT INTERLAMINATION WELDING, SAID METHOD INCLUDING:
- (1) SIMULTANEOUSLY REDUCING THE IRON OXIDES AND OXIDIZING THE ALUMINUM IN SAID LAMINATIONS BY HEATING IN AN ESSENTIALLY DRY HYROGEN ATMOSPHERE HAVING A DEW POINT OF NOT GREATER THAN APPROXIMATELY -35* F. UNTIL A TEMPERATURE OF APPROXIMATELY 1400*F. IS REACHED;
(2) RAISING THE MOISTURE CONTENT OF SAID HYDROGEN ATMOSPHERE TO THE EQUIVALENT OF A DEW POINT OF GREATER THAN APPROXIMATELY +55*F. AND CONTINUING SAID HEATING AT 1400*F. FOR APPROXIMATELY ONE HOUR TO PRODUCE A FILM OF ALUMINIUM OXIDE CONTIGUOUS WITH THE SURFACES OF SAID LAMINATIONS;
AND (3) REDUCING THE MOISTURE CONTENT OF SAID HYDROGEN ATMOSPHERE AND ALLOWING SAID LAMINATIONS TO COOL TO BELOW APPROXIMATELY 300*F.
- (1) SIMULTANEOUSLY REDUCING THE IRON OXIDES AND OXIDIZING THE ALUMINUM IN SAID LAMINATIONS BY HEATING IN AN ESSENTIALLY DRY HYROGEN ATMOSPHERE HAVING A DEW POINT OF NOT GREATER THAN APPROXIMATELY -35* F. UNTIL A TEMPERATURE OF APPROXIMATELY 1400*F. IS REACHED;
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Current AssigneeEdward F. Wohlers, Joseph L. Walker
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Original AssigneeEdward F. Wohlers, Joseph L. Walker
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InventorsWalker, Joseph L., Wohlers, Edward F.
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Application NumberUS04/189,707Time in Patent Office1,533 DaysField of SearchUS Class Current148/280CPC Class CodesC21D 1/70 while heating or quenchingH01F 1/18 with insulating coating
