Browse Prior Art Database

Lubricants for Magnetic Recording Media

IP.com Disclosure Number: IPCOM000092539D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Friedman, H: AUTHOR [+2]

Abstract

Excessive frictional forces between the magnetic recording media and magnetic read-write heads are undesirable. Friction causes signal distortion and creates wear products which tend to collect at the head.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 97% of the total text.

Page 1 of 1

Lubricants for Magnetic Recording Media

Excessive frictional forces between the magnetic recording media and magnetic read-write heads are undesirable. Friction causes signal distortion and creates wear products which tend to collect at the head.

The addition of solid lubricants to magnetic recording media composed of particulate magnetic particles in a binder results in greatly reduced friction between the media and the heads. Several types or classes of solid lubricants exist.

A first class of materials serve as lubricants due to their chemical structure. For example, materials such as graphite, molybdenum disulfide, tungsten disulfide and boron nitride have low coefficients of friction due to the ability of their relatively flat molecules to slide over one another.

Another class of lubricants reduces friction by providing relatively hard, smooth point contacts at the surface of the recording media. Point contact lubricants include cobalt, cobalt oxide, chromium, chromium dioxide, barnesite, colloidal size particles of fluorcarbon resins and similar materials. TEFLON* polytetrafluoroethylene having a size of 0.05 to 0.5 microns is a specific fluorcarbon resin which is useful as a solid lubricant.

Solid lubricant material can be incorporated into a magnetic composition before it is formed into recording media. Alternatively, solid lubricants can be applied to the surface of the media, either before the coating is dried or in a dispersion in a suitable solvent sy...