Ferrofluid seal with epoxy pole pieces
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United States of America Patent
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May 22, 1990
Grant Date -
N/A
app pub date -
Aug 8, 1988
filing date -
Aug 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a ferrofluid seal which comprises a magnet and at least one pole piece, the pole piece is fabricated from a ferromagnetic material which directly bonds to the magnet face. Since the pole piece material directly bonds to the magnet, no additional adhesive is necessary. Thus, the conventional steps of applying an adhesive and mounting pole pieces on the magnet are eliminated. In addition, voids and bubbles in the adhesive are eliminated, thus, enhancing seal integrity. In one embodiment, the ferromagnetic material is a ferromagnetic epoxy compound comprising a mixture of conventional epoxy materials plus a fine powder of ferromagnetic material such as iron, cobalt, nickel or various metal alloys.
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