Stabilized magnetic fluid and method for stabilizing magnetic fluid
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United States of America Patent
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Oct 27, 1998
Grant Date -
N/A
app pub date -
Apr 26, 1996
filing date -
Mar 1, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a magnetic fluid which comprises a magnetic fluid comprising magnetic fine particles coated with a fatty acid in an oily medium, and at least one selected from the group consisting of sulfonate surfactants and animal waxes, has an excellent stability even when used at a high temperature and high humidity and having the fluidity maintained for a long period, and is suitable for use particularly in a severe environment as a bearing, magnetic damper, magnetic seal, specific gravity separator, liquid damper, switch, acceleration sensor, tilt sensor, or heat exchanger for heat pipe or heat sink, and further a magnetic fluid-stabilizing additive allowing the magnetic fluid to have an excellent stability for a long period while maintaining the magnetic fluid's own performance even when used at a high temperature and high humidity for a long period, and a method of stabilizing the magnetic fluid.
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