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Browse Prior Art Database

Crystalline Glass Ceramic for Magnetic Tape Heads

IP.com Disclosure Number: IPCOM000122761D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 48K

Publishing Venue

IBM

Related People

Daughenbaugh, GA: AUTHOR [+2]

Abstract

Crystalline glass ceramic having a tape wear characteristic much greater than that of the magnetic ferrite can be used in the production of multitrack magnetic tape heads. The non-magnetic crystalline glass ceramic could be used in the slots between tracks to add wear protection to the magnetic head. The nonmagnetic low wearing glass ceramic can be placed in critical locations across the air bearing surface of the magnetic head.

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Crystalline Glass Ceramic for Magnetic Tape Heads

      Crystalline glass ceramic having a tape wear characteristic
much greater than that of the magnetic ferrite can be used in the
production of multitrack magnetic tape heads.  The non-magnetic
crystalline glass ceramic could be used in the slots between tracks
to add wear protection to the magnetic head.  The nonmagnetic low
wearing glass ceramic can be placed in critical locations across the
air bearing surface of the magnetic head.

      Crystalline glass ceramic has high hardness and excellent wear
attributes.  Alumina powder added to a glass can produce a
devitrified compound within a glass matrix. The combined material was
found to be superior in wear characteristics.  Ten percent by weight
of one micron size alumina was added to a lead borosilicate glass.
The glass-alumina mixture was subsequently heat treated to produce an
approximately 25% by volume leadsilica-oxide crystalline ceramic
within a borosilicate glass matrix.  The alumina concentration must
be such that a crystalline phase is produced.  Changes in the glass
composition may result in no devitrification or too much bubble
formation.

      To form the track separation in a magnetic head, a slab of
magnetic ferrite in slotted and the powder combination above is
placed into the slots.  The slab is then placed into an infrared
heating furnace.  The glass is melted and devitrified on the slab.
The glassed slab is then placed into a hot i...