High-permeability ni-fe-ta alloy for magnetic recording-reproducing heads

Abstract

Abstract A MAGNETIC RECORDING AND REPRODUCING HEADS HAVING A HIGH PERMEABILITY AND HIGH HARDNESS, CONSISTING OF 60.2 TO 85.0 WT. PERCENT OF NICKEL, 6.0 TO 30.0 WT. PERCENT OF IRON AND 3.1 TO 23.0 WT. PERCENT OF TANTALUM AS THE MAIN INGREDIENT, AND A TOTAL AMOUNT OF 0.01 TO 10.0 WT. PERCENT OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF 0 TO 7.0 WT. PERCENT OF MOLYBDENUM, 0 TO 5.0 WT. PERCENT OF CHROMIUM, 0 TO 10.0 WT. PERCENT OF TUNGSTEN, 0 TO 7.0 WT. PERCENT OF VANADIUM, 0 TO 3.1 WT. PERCENT OF NIOBIUM, 0 TO 10.0 WT. PERCENT OF MANGANESE, 0 TO 7.0 WT. PERCENT OF GERMANIUM, 0 TO 5.0 WT. PERCENT OF TITANIUM, 0 TO 5.0 WT. PERCENT OF ZIRCONIUM, 0 TO 5.0 WT. PERCENT OF ALUMINUM, 0 TO 5.0 WT. PERCENT OF SILICON, 0 TO 5.0 WT. PERCENT OF TIN, 0 TO 5.0 WT. PERCENT OF ANTIMONY, 0 TO 10.0 WT. PERCENT OF COBALT AND 0 TO 10.0 WT. PERCENT 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 AD 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 ORDER-DISORDER 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

• 👤 H Masumoto
• 👤 Y Murakami
• 👤 M Hinai

Bibliographic Details