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Browse Prior Art Database

Production of Submicron Particles

IP.com Disclosure Number: IPCOM000094625D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Landzberg, AH: AUTHOR

Abstract

Metallic submicron magnetic particles are used in the manufacture of magnetic recording tapes. These submicron particles are produced by first depositing metal on a medium and then collecting the particles from the medium.

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Production of Submicron Particles

Metallic submicron magnetic particles are used in the manufacture of magnetic recording tapes. These submicron particles are produced by first depositing metal on a medium and then collecting the particles from the medium.

The deposition of a magnetic metal produces on a substrate a film which consists essentially of submicron particles. Any technique of depositing a magnetic metal or metals such as evaporating, sputtering, electroplating, electroless plating can be used.

After the particles have been deposited on a substrate, a mild chemical etch is applied to the particles to remove and collect them from the substrate. Then the submicron particles are washed, rinsed, and dried, or otherwise treated preparatory to their use in the manufacture of a magnetic tape.

A second collection technique is carried out by depositing the magnetic film on a viscous polymer or petroleum gel. The deposited film again consists essentially of submicron particles. The particles are collected by dissolving the polymer or gel with a suitable dissolving agent.

A third collection technique is implemented by depositing a metal film on a low vapor pressure liquid such as mercury. Again the thin magnetic film consists essentially of submicron magnetic particles. The particles are collected by magnetically separating the particles from the mercury or by other suitable filtering techniques.

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