Browse Prior Art Database

Coated Pivot Bearing Sleeve

IP.com Disclosure Number: IPCOM000123966D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 1 page(s) / 65K

Publishing Venue

IBM

Related People

Prater, W: AUTHOR [+4]

Abstract

This disclosure describes a new pivot design to: 1) eliminate adhesive burrs, 2) increase shock resistance, and 3) prevent abrasive particulate contamination. In addition the pivot design can provide electrical isolation of the actuator

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Coated Pivot Bearing Sleeve

This disclosure describes a new pivot design to: 1)
eliminate adhesive burrs, 2) increase shock resistance, and 3)
prevent abrasive particulate contamination.  In addition the pivot
design can provide electrical isolation of the actuator

   Applying a thin, wear resistant coating with a high
coefficient of friction to the outer diameter of the pivot will
improve its reworkability and reliability, see Fig. 1.  Suitable
coating processes and materials are: 1) electrodeposition of metals,
2) electro-chemical conversion, such as, (anodization) of aluminum to
alumina, 3) chemical conversion, such as stainless steel to iron
boride, 4) plasma spray of a metal or metal alloy, such as CoAlx, and
5) physical vapor deposition, chemical vapor deposition (CVD), ion
implantation, and plasma deposition of metal oxides, metal nitrides,
metal carbides, (such as, titanium nitride, boron carbide, doped
silicon carbide, and titanium carbide) and diamond like coating.  To
achieve electrical insulation coatings of alumina, stabilized
zirconia, silicon nitride, boron nitride, aluminum nitride, and
magnesia can be applied using CVD.

   Desired material properties of the coating would be: 1)
coating hardness greater than Vickers 2100 MPa or Rockwell B-scale of
92, (hard as or harder than 303 SS), 2) coefficient of friction
greater than 0.8, (similar to A1 on SS), 3) thickness greater than 50
Angstroms, and 4) electrical resistivity greater than 1 Ohm-m,
(typical fo...