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Fixed Abrasive Lapping Films

IP.com Disclosure Number: IPCOM000060697D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Gregory, TA: AUTHOR [+3]

Abstract

Fixed abrasive lapping film process which utilizes the steps of absolute filtering with abrasive technology, establishing coating thickness greater than the largest particles to be embedded, embedding the particles by gravitational settling of abrasive particles, calendaring of the uncured abrasive coating. Fixed abrasive lapping films to finish the magnetic surface of rigid magnetic storage disks are improved by the following processes.

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Fixed Abrasive Lapping Films

Fixed abrasive lapping film process which utilizes the steps of absolute filtering with abrasive technology, establishing coating thickness greater than the largest particles to be embedded, embedding the particles by gravitational settling of abrasive particles, calendaring of the uncured abrasive coating. Fixed abrasive lapping films to finish the magnetic surface of rigid magnetic storage disks are improved by the following processes.

First, the abrasive particles are classified to reduce the particle size distribution relative to large particles. This procedure, coupled with absolute filtering, sets a maximum allowable particle size. Second, appropriate dispersants, wetting agents and surfactants are utilized in the blending of the abrasive particles with a polymer binder. Subsequently, sufficient milling obtains a homogeneous dispersion of abrasive particles in the polymer. Absolute filtering is employed with the mixture prior to the application to the substrate for the purpose of establishing the maximum aggregate particle size. Third, the particle- polymer mixture is homogeneously applied to the substrate so that the final coating thickness is both uniform and sufficiently greater than the maximum particle or aggregate as determined by the procedures in first and second steps. In applying a coating of this mixture to the substrate, the viscosity of the mixture can be solvent adjusted to match with the application parameters, thus allowing gravitational settling of the larger ab...