Abrasion resistant magnetic record members

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

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427130, 427131, 427132, 428670, 428671, 428672, 428673, 428680, 428926, 428928, B32B 1508

Patent

active

042243815

ABSTRACT:
A new and improved magnetic recording disk can be prepared by interposing between an aluminum substrate disk and a recording alloy layer a support layer located on the substrate disk and a shield layer located between the support layer and the recording layer. The support layer is a hard, semi-crystalline nickel alloy layer having magnetic properties which is of such a character that if it is contacted by a recording head during the use of the disk it will tend to form a powder which will not interfere with subsequent use of the disk or recording head. The shield layer is of a nonmagnetic metal and serves to reflect signals from the recording head so that they do not reach the support layer. The support layer is created by forming an electroless nickel alloy deposit in the substrate and subsequently heating this deposit at a temperature which will not cause warpage of the substrate but which cause the deposit to change to a desired physical form while concurrently causing diffusion of nickel into the substrate. Such diffusion has the effect of increasing the amount of the alloying element in the support layer and firmly bonding the support layer to the substrate.

REFERENCES:
patent: 3578571 (1971-05-01), McQuaid et al.
patent: 3595630 (1971-03-01), Wilhelm et al.
patent: 3634209 (1972-01-01), Wolf et al.
patent: 3702239 (1972-11-01), Nagy et al.
patent: 3738818 (1973-06-01), Stone et al.

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