Browse Prior Art Database

the Use of Ceramic Foam Materials in Components of Head-disk Assemblies

IP.com Disclosure Number: IPCOM000062015D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chapman, DW: AUTHOR [+3]

Abstract

Ceramic foam materials, such as silicon-nitride (Si3N4) and/or silicon carbide (SiC) foam material manufactured by ERG Company as Duocel brand, or ceramic honeycomb, can be used to form spindle hubs and/or shafts, disk spacers, base plates and/or frames, and actuator arms, all of which are components in magnetic recording disk file head-disk assemblies.

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the Use of Ceramic Foam Materials in Components of Head-disk Assemblies

Ceramic foam materials, such as silicon-nitride (Si3N4) and/or silicon carbide (SiC) foam material manufactured by ERG Company as Duocel brand, or ceramic honeycomb, can be used to form spindle hubs and/or shafts, disk spacers, base plates and/or frames, and actuator arms, all of which are components in magnetic recording disk file head-disk assemblies.

Such ceramic foam materials have a low coefficient of thermal expansion, a low density and considerably less tendency to distort due to aging than aluminum or other conventional metals used in head-disk assemblies.

The ceramic foam base plate and frame and the disk spacers may be formed of a ceramic skin surrounding a ceramic foam core.

The ceramic foam hub can be formed on a conventional shaft or integrally formed with a ceramic foam shaft. The ceramic foam disk hub can also be press-fit onto a titanium or zirconium shaft. Unlike steel, which is the conventional spindle motor shaft material, the titanium or zirconium alloy will yield sufficiently enough to allow a press-fit without the shaft or ceramic foam hub breaking. In addition, the titanium or zirconium alloy shaft has a low coefficient of thermal expan which is not substantially greater than that of the ceramic foam hub.

The use of the ceramic foam material on the actuator arm, because of the low coefficient of thermal expansion, reduces track misregistration. In addition, the increase...