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Non-magnetic Ceramic Slots for Magnetic Tape Heads

IP.com Disclosure Number: IPCOM000122762D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Related People

Daughenbaugh, GA: AUTHOR [+2]

Abstract

Low wear, hard, non-magnetic ceramic material may be established in hard to access magnetic tape head areas.

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This is the abbreviated version, containing approximately 100% of the total text.

Non-magnetic Ceramic Slots for Magnetic Tape Heads

      Low wear, hard, non-magnetic ceramic material may be
established in hard to access magnetic tape head areas.

      Magnetic tape heads contain non-magnetic sections, such as the
glass closure slot areas generally found in magnetic tape heads.  It
is desirable to replace the glass with a strong low wearing ceramic
material.  The high melting points of ceramics makes it difficult, if
not impossible, to pre-melt a ceramic and pour it into a magnetic
ferrite slot without destroying the magnetic properties of the
ferrite. A pyroceramic frit is available from Corning Glass
Corporation which has a use as a ferrite sealant.  The frit melts at
approximately 750 degrees C and can be poured as a glass into the
slots of the magnetic head with very little reaction with the
ferrite.  When the temperature is increased by 50 degrees C, the
pyroceramic frit converts to a high density, low wear ceramic.  The
frit is primarily a zinc borate.  A second material with a higher
expansion coefficient based on lead borate can be used to increase
the coefficient of thermal expansion of the zinc borate.  The melting
point of the materials selected should have a melting point below
1000 degrees C to decrease ferrite interaction and ferrite grain
growth problems.

      Disclosed anonymously.