Application of ferro-cobalt magnetic fluid for oil sealing

Ferro-cobalt magnetic powder in nano-meter size is manufactured to implement in a magnetic fluid sealing mechanism. The powder is coated with silicon dioxide for the prevention of aggregation. Also three surface active agents are applied to improve particle dispersion in fluid medium. The average si...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 267; no. 1; pp. 105 - 110
Main Authors Kim, Young Sam, Kim, Young Han
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.11.2003
Elsevier Science
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Ferro-cobalt magnetism
Fine-particle systems
Magnetic fluid
Magnetic liquids
Magnetic properties and materials
Nano-particle
Oil sealing
Particle coating
Physics
Small particles and nanoscale materials
Studies of specific magnetic materials
Oil sealing
Ferro-cobalt magnetism
Particle coating
Nano-particle
Magnetic fluid
Powders
Pressure effects
Magnetization
Magnetic field effects
Iron alloys
Experimental study
Coated material
Binary alloys
Particle size distribution
Colloidal suspension
Cobalt alloys
Magnetic fluids
Transition element alloys
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Summary:Ferro-cobalt magnetic powder in nano-meter size is manufactured to implement in a magnetic fluid sealing mechanism. The powder is coated with silicon dioxide for the prevention of aggregation. Also three surface active agents are applied to improve particle dispersion in fluid medium. The average size of the powder particle is 9.4 nm, and its magnetization is 154 emu/g in the magnetic field of 10 kOe. The dispersed particle shows little settlement for 20 weeks. From the sealing performance test, the holding pressure is 25 times as high as that of a conventional magnetite sealing.
ISSN:0304-8853
DOI:10.1016/S0304-8853(03)00342-1