Method of manufacturing magnetic particle, magnetic particle and magnetic recording medium
AssigneeFUJIFILM Corporation
InventorsFumiko Shiraishi, Yasunori Ichikawa, Koukichi Waki, Yasushi Hattori
Life of this patent
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Abstract
The solution I is spouted from a first nozzle into a mixing chamber as a high-pressure jet stream of not less than 1 MPa and as a turbulent flow having a Reynolds number of not less than 10000 during the flow into the mixing chamber, and the solution II having a lower pressure than the solution I is spouted from a second nozzle into the mixing chamber as an orthogonal flow which intersects the solution I almost at right angles. The two solutions are mixed together and caused to react with each other, with the result that a mixed reaction solution Z containing alloy particles Z is formed.
Claims14
A method of manufacturing a magnetic particle, comprising:
- the alloy particle preparation step of preparing an alloy particle capable of forming a CuAu type or Cu3Au type hard magnetic ordered alloy phase and
- the magnetic particle formation step;
- wherein in said alloy particle preparation step, a plurality of kinds of solutions for preparing said alloy particle are mixed together and caused to react with each other in a mixing field by a liquid phase process and at least one of said plurality of kinds of solutions is mixed by a high-pressure mixing method which involves supplying the solution to the mixing field by a high-pressure jet stream of not less than 1 MPa,
- wherein said liquid phase process is a reversed micelle process and the high-pressure mixing method is a one jet mixing process.
Dependencies are inferred from the claim text.