Sintered cobalt ferrites composite material with high magnetostriction

摘要

Disclosed herein is a sintered cobalt ferrite composite material comprising of nano and micron sized powders of cobalt ferrite with high magnetostriction. The present invention further discloses preparation of nano and micron sized powders of cobalt ferrite, in particular, the auto combustion process using glycine as fuel for preparing nano sized cobalt ferrite powders.

主权项

1. Sintered cobalt ferrite composite material comprising of nano and/or micron sized powders of cobalt ferrite, wherein particle size of the nano sized powder of cobalt ferrite powder is in the range 3 to 40 nm and particle size of micron sized powder of cobalt ferrite is in the range of 1 to 10 μm, wherein the ratio of nano sized powder of cobalt ferrite to the micron sized powder of cobalt ferrite in said composite is in the ratio ranging between 70:30 to 95:5, and the ratio of nano-nano sized powder of cobalt ferrite in said composite is in the ratio ranging between 90:10 to 50:50 wherein said composite material has density in the range of 79-84% compared to theoretical density and magnetostriction is in the range of 240-400 ppm.