Patent ID: 6255477
Filing Date: 2001-07-03
Classification: B03C,B82Y,C03C,C07H,C12N,C12Q,H01F,Y10S,Y10T

Abstract:
A method of manufacturing magnetic glass particles having an average particle size of less than 100 .mu.m comprising:a) forming a sol from an alcohol and metal alkoxides;b) contacting the sol with magnetic cores to form a mixture of the magnetic cores and the sol;c) spray-drying said mixture of the magnetic cores and the sol to obtain magnetic cores enclosed in a gel layer formed by gelling the sol;d) heating said magnetic cores enclosed in the gel layer to obtain magnetic cores coated with glass, wherein said magnetic cores coated with glass have a substantially pore-free glass surface; and thereaftere) recovering said magnetic cores coated with glass to obtain individually free magnetic glass particles.