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Browse Prior Art Database

Recording Medium

IP.com Disclosure Number: IPCOM000092008D
Original Publication Date: 1968-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Brownlow, JM: AUTHOR

Abstract

A disk-type magnetic recording medium is fabricated on an aluminum substrate. The aluminum surface is first anodized to produce a porous oxide layer. The vertical pillars of oxide at the surface are separated by pores which form vertical channels. A magnetic material can be deposited in these channels by decomposition and reduction of metal salts. Nickel chloride solutions are used to impregnate the pores in the surface and this solution is dried and heated to 450 degrees C in a reducing atmosphere such as N(2)-H(2) or CO-CO(2) mixtures. Dextrin in the solution also aids reduction. The reduced metal particles fill in the pores between the pillars of oxide to produce the composite magnetic layer. This composite layer is adherent and abrasion resistant. Finally the structure is hardened by sealing.

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Recording Medium

A disk-type magnetic recording medium is fabricated on an aluminum substrate. The aluminum surface is first anodized to produce a porous oxide layer. The vertical pillars of oxide at the surface are separated by pores which form vertical channels. A magnetic material can be deposited in these channels by decomposition and reduction of metal salts. Nickel chloride solutions are used to impregnate the pores in the surface and this solution is dried and heated to 450 degrees C in a reducing atmosphere such as N(2)-H(2) or CO-CO(2) mixtures. Dextrin in the solution also aids reduction. The reduced metal particles fill in the pores between the pillars of oxide to produce the composite magnetic layer. This composite layer is adherent and abrasion resistant. Finally the structure is hardened by sealing. A solution which can be used for the decomposition and reduction process is as follows: H(2)O 1000 cc NiCl(2) - 6H(2)O 600 g CuCl(2)- 6H(2)O 20 g CoCl(2)- 6H(2)O 20 g Dextrin 30.

It is also possible to form the magnetic layer in the pores by plating.

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