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Browse Prior Art Database

Use of an Encapsulant to Control Contamination in a Disk Storage Device

IP.com Disclosure Number: IPCOM000048256D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Weaver, KF: AUTHOR

Abstract

The release of particulate contamination within the head/ disk enclosure of a disk storage device employing flying heads in a filtered atmosphere is prevented by the coating of the enclosure base casting by an encapsulant. Electrophoretic coating is the preferred technique of encapsulation.

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Use of an Encapsulant to Control Contamination in a Disk Storage Device

The release of particulate contamination within the head/ disk enclosure of a disk storage device employing flying heads in a filtered atmosphere is prevented by the coating of the enclosure base casting by an encapsulant. Electrophoretic coating is the preferred technique of encapsulation.

The base casting of this type of disk file is typical an aluminum die-casting. It is impossible to clean such castings sufficiently well to prevent the release of debris trapped in surface irregularities when the casting is subject to mechanical shocks during assembly or shipment. Released debris can damage the disks or read/write heads of the file. Encapsulation of such debris by electrophoretic coating traps any contamination prior to assembly. The relatively smooth surface produced also facilitates the cleaning of the base casting prior to subsequent file assembly steps carried out in a clean room. In such cleaning, oil and other residues may be removed with conventional solvents.

The preferred process of coating an aluminum die-casting is as follows: 1. The casting is pretreated to prepare the surface for successful film application by firstly cleaning it with

an alkaline solution and subsequently rinsing it with a

deoxidizer and with water. The casting is next desmutted

with a nitric/ hydrofluoric acid solution and, finally,

rinsed in de-ionized water. 2. The casting is coated in an anodic electrophor...