Patent US3871927A successfully refreshed from Google Patents.
US3871927A
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US
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Process for producing a high-permeability alloy for magnetic recording-reproducing heads
Assignee: Research Institute for Electromagnetic Materials
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Filing: 1973-07-20
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Granted: 1975-03-18
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Expires: 1993-07-20
Abstract
Abstract A magnetic recording and reproducing heads having a high permeability and high hardness, consisting of 60.2 to 85.0 Wt.% of nickel, 6.0 to 30.0 Wt.% of iron and 3.1 to 23.0 Wt.% of tantalum as the main ingredient, and a total amount of 0.01 to 10.0 Wt.% of at least one element selected from the group consisting of 0 to 7.0 Wt.% of molybdenum, 0 to 5.0 Wt.% of chromium, 0 to 10.0 Wt.% of tungsten, 0 to 7.0 Wt.% of vanadium, 0 to 3.1 Wt.% of niobium, 0 to 10.0 Wt.% of manganese, 0 to 7.0 Wt.% of germanium, 0 to 5.0 Wt.% of titanium, 0 to 5.0 Wt.% of zirconium, 0 to 5.0 Wt.% of aluminum, 0 to 5.0 Wt.% of silicon, 0 to 5.0 Wt.% of tin, 0 to 5.0 Wt.% of antimony, 0 to 10.0 Wt.% of cobalt and 0 to 10.0 Wt.% of copper as the subingredient, and an inevitable amount of impurities, characterized in that the alloy has the degree of order of 0.1 to 0.6, the Vickers hardness of more than 150, the initial permeability of more than 3,000 and maximum permeability of more than 5,000, and a method of manufacturing a magnetic recording and reproducing head having a high permeability, by heating said alloy articles at a temperature above 800*C but lower than the melting point in a non-oxidizing atmosphere or in vacuo for at least more than 1 minute but not longer than 100 hours depending upon the composition, and cooling from a temperature of more than orderdisorder transformation point to a room temperature at a suitable speed depending upon the composition so as to provide the degree of order of 0.1 to 0.6 and the Vickers hardness of more than 150.
Inventors
- 👤 Hakaru Masumoto
- 👤 Yuetsu Murakami
- 👤 Masakatsu Hinai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:53
CPC Classifications
C; C22; C22C; C22C19/00; G; G11; G11B; G11B5/00; G11B5/127; G11B5/147
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
291 words
A METHOD OF MANUFACTURING A HIGH PERMEABILITY AND HIGH HARDNESS ALLOY FOR USE FOR MAGNETIC RECORDING AND REPRODUCING HEADS COMPRISING, MELTING AN ALLOY CONSISTING OF 60.2 TO 85.0 WT. % OF NICKEL, 6.0 TO 30.0 WT. % IRON AND 3.1 TO 23.0 WT. % OF TANTALUM AS THE MAIN INGREDIENT, AND FURTHER CONSISTING OF THE TOTAL AMOUNT OF 0.01 TO I0.0 WT. % OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF 0 TO 7 WT. % OF MOLYBDENUM, 0 TO 5.0 WT. % OF CHROMIUM, 0 TO 10.0 WT. % OF TUNGSTEN, 0 TO 7.0 WT. % OF VANADIUM, 0 TO 3.1 WT. % OF NIOBIUM, 0 TO 10.0 WT. % OF MANGANESE, 0 TO 7.0 WT. % OF GERMANIUM, 0 TO 5.0 WT. % OF TITANIUM, 0 TO 5.0 WT. % OF ZIRCONIUM, 0 TO 5.0 WT. % OF ALUMINUM, 0 TO 5.0 WT. % OF SILICON, 0 TO 5.0 WT. % OF TIN, 0 TO 5.0 WT. % OF ANTIMONY, 0 TO 10.0 WT. % OF COBALT, AND 0 TO 10.0 WT. % OF COPPER AS THE SUBINGREDIENT, AND AN INEVITABLE AMOUNT OF IMPURITIES SO AS TO FORM AN ALLOY HAVING A HOMOGENIZED SOLID SOLUTION STRUCTURE, HEATING AT A TEMPERATURE OF MORE THAN 800*C, IN A NONOXIDIZING ATMOSPHERE OR IN VACUO, FOR AT LEAST MORE THAN 1 MINUTE BUT NOT LONGER THAN 100 HOURS DEPENDING UPON THE COMPOSITION,AND COOLING FROM A TEMPERATURE OF MORE THAN THE ORDER-DISORDER TRANSFORMATION POINT OF ABOUT 600*C TO A ROOM TEMPERATURE AT A SUITABLE SPEED DEPENDING UPON THE COMPOSITION SO AS TO PROVIDE THE DEFREE OF ORDER OF 0.1 TO 0.6, THE VICKERS HARDNESS OF MORE THAN 150, INITIAL PERMEABILITY OF MORE THAN 3,000 AND MAXIMUM PERMEABILITY OF MORE THAN 5,000.
Claim 2
Independent Claim
291 words
A METHOD OF MANUFACTURING A HIGH PERMEABILITY AND HIGH HARDNESS ALLOY FOR USE FOR MAGNETIC RECORDING AND REPRODUCING HEADS COMPRISING, MELTING AN ALLOY CONSISTING OF 60.2 TO 85.0 WT. % OF NICKEL, 6.0 TO 30.0 WT. % IRON AND 3.1 TO 23.0 WT. % OF TANTALUM AS THE MAIN INGREDIENT, AND FURTHER CONSISTING OF THE TOTAL AMOUNT OF 0.01 TO I0.0 WT. % OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF 0 TO 7 WT. % OF MOLYBDENUM, 0 TO 5.0 WT. % OF CHROMIUM, 0 TO 10.0 WT. % OF TUNGSTEN, 0 TO 7.0 WT. % OF VANADIUM, 0 TO 3.1 WT. % OF NIOBIUM, 0 TO 10.0 WT. % OF MANGANESE, 0 TO 7.0 WT. % OF GERMANIUM, 0 TO 5.0 WT. % OF TITANIUM, 0 TO 5.0 WT. % OF ZIRCONIUM, 0 TO 5.0 WT. % OF ALUMINUM, 0 TO 5.0 WT. % OF SILICON, 0 TO 5.0 WT. % OF TIN, 0 TO 5.0 WT. % OF ANTIMONY, 0 TO 10.0 WT. % OF COBALT, AND 0 TO 10.0 WT. % OF COPPER AS THE SUBINGREDIENT, AND AN INEVITABLE AMOUNT OF IMPURITIES SO AS TO FORM AN ALLOY HAVING A HOMOGENIZED SOLID SOLUTION STRUCTURE, HEATING AT A TEMPERATURE OF MORE THAN 800*C, IN A NONOXIDIZING ATMOSPHERE OR IN VACUO, FOR AT LEAST MORE THAN 1 MINUTE BUT NOT LONGER THAN 100 HOURS DEPENDING UPON THE COMPOSITION,AND COOLING FROM A TEMPERATURE OF MORE THAN THE ORDER-DISORDER TRANSFORMATION POINT OF ABOUT 600*C TO A ROOM TEMPERATURE AT A SUITABLE SPEED DEPENDING UPON THE COMPOSITION SO AS TO PROVIDE THE DEFREE OF ORDER OF 0.1 TO 0.6, THE VICKERS HARDNESS OF MORE THAN 150, INITIAL PERMEABILITY OF MORE THAN 3,000 AND MAXIMUM PERMEABILITY OF MORE THAN 5,000.
Claim 3
Independent Claim
349 words
A method of manufacturing a Ni-Fe-Ta alloy having high permeability and high hardness for use for magnetic recording and reproducing heads comprising, melting an alloy consisting of 60.2 to 85.0 Wt. % of nickel, 6.0 to 30.0 Wt. % of iron and 3.1 to 23.0 Wt. % of tantalum as the main ingredient, and further consisting of the total amount of 0.01 to 10.0 Wt. % of at least one element selected from the group consisting of 0 to 7.0 Wt. % of molybdenum, 0 to 5.0 Wt. % of chromium, 0 to 10.0 Wt. % of tungsten, 0 to 7.0 Wt. % of vanadium, 0 to 3.1 Wt. % of niobium, 0 to 10.0 Wt. % of manganese, 0 to 7.0 Wt. % of germanium, 0 to 5.0 Wt. % of titanium, 0 to 5.0 Wt. % of zirconium, 0 to 5.0 Wt. % of aluminum, 0 to 5.0 Wt. % of silicon, 0 to 5.0 Wt. % of tin, 0 to 5.0 Wt. % of antimony, 0 to 10.0 Wt. % of cobalt, and 0 to 10.0 Wt. % of copper, and an inevitable amount of impurities, heating it at a temperature of more than 800*C, but lower than the melting point, in a non-oxidizing atmosphere or in vacuo, for at least more than 1 minute but not longer than 100 hours, cooling it to a room temperature from a temperature of more than the order-disorder transformation point of about 600*C at a suitable cooling speed of from 100*C/second to 1*C/hour depending upon the alloy composition, and further heating it at a temperature of less than the order-disorder transformation point of about 600*C, in a non-oxidizing atmosphere or in vacuo, for at least more than 1 minute but not longer than 100 hours depending upon the alloy composition, and cooling it to a room temperature at a suitable cooling speed from 100*C/second to 1*C/hour so as to provide the degree of order of 0.1 to 0.6, the Vickers hardness or more than 150, initial permeability of more than 3, 000 and maximum permeability of more than 5,000.
Claim 4
Independent Claim
349 words
A method of manufacturing a Ni-Fe-Ta alloy having high permeability and high hardness for use for magnetic recording and reproducing heads comprising, melting an alloy consisting of 60.2 to 85.0 Wt. % of nickel, 6.0 to 30.0 Wt. % of iron and 3.1 to 23.0 Wt. % of tantalum as the main ingredient, and further consisting of the total amount of 0.01 to 10.0 Wt. % of at least one element selected from the group consisting of 0 to 7.0 Wt. % of molybdenum, 0 to 5.0 Wt. % of chromium, 0 to 10.0 Wt. % of tungsten, 0 to 7.0 Wt. % of vanadium, 0 to 3.1 Wt. % of niobium, 0 to 10.0 Wt. % of manganese, 0 to 7.0 Wt. % of germanium, 0 to 5.0 Wt. % of titanium, 0 to 5.0 Wt. % of zirconium, 0 to 5.0 Wt. % of aluminum, 0 to 5.0 Wt. % of silicon, 0 to 5.0 Wt. % of tin, 0 to 5.0 Wt. % of antimony, 0 to 10.0 Wt. % of cobalt, and 0 to 10.0 Wt. % of copper, and an inevitable amount of impurities, heating it at a temperature of more than 800*C, but lower than the melting point, in a non-oxidizing atmosphere or in vacuo, for at least more than 1 minute but not longer than 100 hours, cooling it to a room temperature from a temperature of more than the order-disorder transformation point of about 600*C at a suitable cooling speed of from 100*C/second to 1*C/hour depending upon the alloy composition, and further heating it at a temperature of less than the order-disorder transformation point of about 600*C, in a non-oxidizing atmosphere or in vacuo, for at least more than 1 minute but not longer than 100 hours depending upon the alloy composition, and cooling it to a room temperature at a suitable cooling speed from 100*C/second to 1*C/hour so as to provide the degree of order of 0.1 to 0.6, the Vickers hardness or more than 150, initial permeability of more than 3, 000 and maximum permeability of more than 5,000.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said heating at a temperature of more than 800*C is carried out at a temperature more than 1, 100*C.
Claim 6
Dependent Claim
25 words
The process of claim 2 wherein said heating at a temperature of more than 800*C is carried out at a temperature of more than 1,100*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |