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Recording Disk

IP.com Disclosure Number: IPCOM000090306D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Secrist, DR: AUTHOR

Abstract

A metal blank is coated with a thin pore-free layer of low-temperature glass of 50-100 microinch thickness by RF sputtering or infrared glazing employing available glass transfer tapes. The blank is then heated to a temperature greater than the softening point of the glass so that the glass is of low viscosity but does not flow. A uniform layer of sub-micro-sized magnetic oxide powder is gradually sifted onto the hot glass surface by vibrating the powder through a fine mesh screen. The particles settle into the glass coating resulting in a uniform dispersion. Another method for obtaining a uniform dispersion employs a transfer tape composed of a mixture of glass and magnetic oxide powders. The mixture of glass and up to 50% magnetic oxide powder is applied to the blank. After heat treatment, a durable coating is obtained.

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Recording Disk

A metal blank is coated with a thin pore-free layer of low-temperature glass of 50-100 microinch thickness by RF sputtering or infrared glazing employing available glass transfer tapes. The blank is then heated to a temperature greater than the softening point of the glass so that the glass is of low viscosity but does not flow. A uniform layer of sub-micro-sized magnetic oxide powder is gradually sifted onto the hot glass surface by vibrating the powder through a fine mesh screen. The particles settle into the glass coating resulting in a uniform dispersion. Another method for obtaining a uniform dispersion employs a transfer tape composed of a mixture of glass and magnetic oxide powders. The mixture of glass and up to 50% magnetic oxide powder is applied to the blank. After heat treatment, a durable coating is obtained. The final steps of the process include lapping and polishing of the disk coating to a required thickness. Titanium and its alloys are metals which are suitable as blanks.

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