Dynamic magnetic information storage or retrieval – Head – Core
Patent
1970-07-30
1976-12-21
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Head
Core
252 6256, G11B 522, G11B 514
Patent
active
039992160
ABSTRACT:
A magnetic head assembly wherein the material of the pole tips or of the pole pieces comprises a hot-pressed sintered iron-silicon-aluminum alloy, the particles of such alloy preferably being provided with a nitride layer or coating prior to sintering for preventing or retarding grain growth during sintering and to provide increased electrical resistivity and hardness in the end product. The preferred hot-pressed sintered material is characterized by a substantially uniform grain size most preferably of between about 40 microns and 60 microns, a porosity of substantially less than one percent, a Vickers hardness greater than 600, and a resistivity of at least about 100 micro-Ohm-cm.
A method of making such a sintered material preferably comprises heating an iron-silicon-aluminum alloy powder in an atmosphere of nitrogen to form a nitride layer thereon, blending 80% of such nitrided alloy powder with from about 10 to 20% of elemental iron, silicon and aluminum powders, without varying the composition from that desired in the final alloy, and heating the mixture to a sintering temperature while applying a pressure of about 1000 pounds per square inch.
REFERENCES:
patent: 2801942 (1957-07-01), Nachman
patent: 2992474 (1961-07-01), Adams
patent: 3262763 (1966-07-01), Bechtold
patent: 3417386 (1968-12-01), Schneider
patent: 3424685 (1969-01-01), Pierrot
patent: 3469942 (1969-09-01), Henneberger et al.
patent: 3472655 (1969-10-01), Fuchs et al.
patent: 3557266 (1971-01-01), Chiba et al.
Eastman Kodak Company
Eddleman Alfred H.
Wiese B. D.
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