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Browse Prior Art Database

Multiple Component Deposition

IP.com Disclosure Number: IPCOM000080484D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Rigby, EB: AUTHOR

Abstract

Described is a process whereby more than one type of chemically and physically identifiable particles may be deposited concurrently as a monolayer on a substrate. These composite layers may be built up to a multiplicity of layers to a desired thickness. Autoelectrophoretic deposition techniques are utilized. Two distinct types of magnetic particles may be deposited to provide improved magnetic media.

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Multiple Component Deposition

Described is a process whereby more than one type of chemically and physically identifiable particles may be deposited concurrently as a monolayer on a substrate. These composite layers may be built up to a multiplicity of layers to a desired thickness. Autoelectrophoretic deposition techniques are utilized. Two distinct types of magnetic particles may be deposited to provide improved magnetic media.

Dispersions containing two or more discrete identifiable type particles, one micron or less in size are brought into contact with a substrate material. The substrate may be of glass, metal, ceramic or polymer type materials. Each type of particle in the dispersion is to be uniform as to size, shape and chemical characteristics, as compared to its own species; however, there may be a great deal of difference as to size, shape and chemical characteristics between the various discrete types of particles in the dispersion. In accordance with autoelectrophoretic deposition techniques, these particles become irreversibly adsorbable on the substrate. The surface is coated with at least one layer of particles composed of at least two different chemical compositions.

The excess dispersion is rinsed off and then the coated substrate normally air dried. The coated surface is next brought into contact with a second dispersion different from the first. It may contain only one discrete type particle or may be composed of more than one type. The compos...