Patent Number: 6,251,514

Title: Ferromagnetic powder for low core loss, well-bonded parts, parts made therefrom and methods for producing same

Abstract: A ferromagnetic powder comprising ferromagnetic particles coated with a material that does not degrade at temperatures above C. and permits adjacent particles to strongly bind together after compaction such that parts made from the ferromagnetic powder have a transverse rupture strength of about 8,000 to about 20,000 pounds/square inch before sintering. The coating includes from 2 to 4 parts of an oxide and one part of a chromate, molybdate, oxalate, phosphate, or tungstate. The coating may be substantially free of organic materials. The invention also includes a method of making the ferromagnetic powder, a method of making soft magnetic parts from the ferromagnetic powder, and soft magnetic parts made from the ferromagnetic powder.

Inventors: Lashmore; David S. (Lebanon, NH), Beane; Glenn L. (Hanover, NH), Deresh; Lev (Plainfield, NH), Hua; Zonglu (Lebanon, NH)

Assignee: Materials Innovation, Inc.

International Classification: B22F 1/02 (20060101); C22C 33/02 (20060101); C22C 32/00 (20060101); H01F 1/33 (20060101); H01F 41/02 (20060101); H01F 1/12 (20060101); H02K 1/00 (20060101); H02K 1/02 (20060101); H01F 1/24 (20060101); B32B 005/16 ()

Expiration Date: 06/26/2018