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Burnishing Tool for Flexible Disks with Chromium Dioxide Coatings

IP.com Disclosure Number: IPCOM000088929D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Harker, DL: AUTHOR [+2]

Abstract

The burnishing tool 50 takes the place of the knife-edged burnishing tool 10 shown in the IBM Technical Disclosure Bulletin, Vol. 19, No. 10, March, 1977, pages 3829 and 3830, and is particularly shaped and coated so as to be effective for burnishing flexible magnetic disks of the type described in said publication but having chromium dioxide magnetic coatings.

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Burnishing Tool for Flexible Disks with Chromium Dioxide Coatings

The burnishing tool 50 takes the place of the knife-edged burnishing tool 10 shown in the IBM Technical Disclosure Bulletin, Vol. 19, No. 10, March, 1977, pages 3829 and 3830, and is particularly shaped and coated so as to be effective for burnishing flexible magnetic disks of the type described in said publication but having chromium dioxide magnetic coatings.

Burnishing tool 50, in lieu of the knife edge 22 described in said publication, has a rounded edge 50a which makes contact with the surface of the disk being burnished. Edge 50a has a radius of .020 inch to .030 inch (.050 centimeter to
.076 centimeter). The surface of burnishing tool 50 and particularly its burnishing surface 50a has alumina-titania introduced by the use of plasma flame spray technology so that the surface of tool 50 that is in contact with the flexible disk has sufficient hardness for the chromium dioxide magnetic coating. Plasma flame technology allows any abrasive refractory material available in powder form to be sprayed onto the tool 50 and particularly its rounded effective surface 50a without the high cost of machining such abrasive refractory material from sawed material. The substrate for the alumina-titania coating of tool 50 may be aluminum, brass, steel or even plastic. Alumina-titania for the coating of surface 50a of tool 50 is preferred and is more effective than other abrasive materials such as tungsten carb...