Patent ID: 8236420

Claim:
A ferromagnetic powder composition comprising soft magnetic iron-based core particles, wherein the surface of the core particles is provided with a first phosphorus-based inorganic insulating layer and at least one metal-organic layer, located outside the first layer, of a metal-organic compound having the following general formula: R 1 [(R 1 ) x (R 2 ) y (MO n-1 )] n R 1 wherein M is a central atom selected from Si, Ti, Al, or Zr; O is oxygen; R 1 is a hydrolysable group; R 2 is an organic moiety and wherein at least one R 2 contains at least one amino group; wherein n is the number of repeatable units being an integer between 1 and 20; wherein the x is an integer between 0 and 1; wherein y is an integer between 1 and 2; wherein a metallic or semi-metallic particulate compound having a Mohs hardness of less than 3.5 is adhered to at least one metal-organic layer; and wherein the powder composition further comprises a particulate lubricant.