Ferrite raw material powder made by spraying pyrolysis method and making method of ferrimagnetics

Application Number  00129582 Application Date  2000.10.08
Publication Number  1291778 Publication Date  2001.04.18
Priority Information   2000/5/23 JP 151019/2000; 1999/10/8 JP 287789/1999  
Applicant(s) Name  Sumitomo Special Metals Co., Ltd.  
Inventor(s) Name  Ota Etsushi  
Patent Agency Code  11021 Patent Agent  huang yongkui
AbstractProvided is a manufacturing method of ferrite magnetic powder, of which composition and grain size are uniform and fine, thereby providing excellent magnetic properties. The manufacturing method includes spraying mixed solution in which chloride of iron and chloride of strontium are dissolved, under a heating atmosphere. The mixed solution to be sprayed contains FeCl2 of at least 25% and at most 35% and SrCl2 of at least 2.4% and at most 4.9%. The powder particles formed by spraying have a crystal structure of magnetoplumbite type hexagonal system whose basic composition is expressed by SrO.nFe2O3 (n is 5.0 or more and 6.5 or less), and exhibit superior magnetic characteristics.