PROCESS OF MANUFACTURE OF ANISOTROPIC PERMANENT MAGNETS ON BASE OF STRONTIUM FERRITE Russian patent published in 1995 - IPC

FIELD: powder metallurgy. SUBSTANCE: wet grinding of ferrite powder is conducted with advance injection into it of complex additive containing dust-like burnt quartz preliminarily calcined at temperature 900-1200 C for the course of 3 h. After wet grinding powder suspension is unloaded and moisture is removed, then pressing is performed in constant magnetic field and sintering at 1200 C is conducted for the course of 2 h. EFFECT: use of dust-like quartz makes it possible to reduce cost of magnets. 2 cl, 1 tbl