MAGNETORHEOLOGICAL FLUID WITH IMPROVED REDISPERSIBILITY AND METHOD FOR EVALUATING REDISPERSIBILITY OF MAGNETORHEOLOGICAL FLUID

Disclosed are a magnetorheological fluid and a method for evaluating re-dispersibility of a magnetorheological fluid. According to the present invention, a magnetorheological fluid comprising magnetic particles, a dispersing medium, and an additive, wherein, when all solid components in the magnetor...

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Bibliographic Details
Main Authors KIM, Joonsup, CHOI, Minkyu, SHIN, Euisup, KIM, Hyoungjun
Format Patent
LanguageEnglish
French
German
Published 01.05.2019
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MAGNETS
MEASURING
PHYSICS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TESTING
TRANSFORMERS
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Summary:Disclosed are a magnetorheological fluid and a method for evaluating re-dispersibility of a magnetorheological fluid. According to the present invention, a magnetorheological fluid comprising magnetic particles, a dispersing medium, and an additive, wherein, when all solid components in the magnetorheological fluid are recovered to measure particle size distribution and to obtain a span value (span value) defined below: span value = (D 90 - D 10 ) / D 50 , wherein D 90 , D 10 and D 50 respectively indicate particle sizes corresponding to 90 %, 10 %, and 50 % of the maximum value in a cumulative distribution of particle sizes of solid components, and the span value is 1.3 or more. According to the present invention, a method for evaluating re-dispersibility of a magnetorheological fluid includes providing a transparent container containing a magnetorheological fluid; measuring an amount of light that pass through the transparent container by irradiating near-infrared rays while rotating the transparent container by a centrifuge (primary dispersion stability measurement); re-dispersing the centrifuged solid components into the dispersing medium by applying an external force to the magnetorheological fluid; and measuring an amount of light that pass through the transparent container by irradiating near-infrared rays while re-rotating the transparent container containing a magnetorheological fluid in which the solid components are re-dispersed by the centrifuge (secondary dispersion stability measurement).
Bibliography:Application Number: EP20170792864