Patent ID: 7153594

Claim:
A ferromagnetic powder composition for die compaction to produce high density soft magnetic composite parts comprising soft magnetic iron-based core particles wherein at least 40% of said iron-based core particles consist of particles having a particle size above about 106 μm and less than 5% of said iron-based ore particles having a particle size below 45 μm and wherein the surfaces of the core particles are surrounded by an insulating inorganic coating, and a lubricating amount of a compound selected from the group consisting of silanes, titanates, aluminates, zirconates, or mixtures thereof, having the following general formula: M(R 1 ) n (R 2 ) m , wherein M is a central atom selected from Si, Ti, Al, or Zr, R 1 , is a hydrolysable group, R 2 is a group consisting of a lubricating organic moiety, wherein the sum of m+n is the coordination number of the central atom; n is an integer ≧1and m is an integer ≧1.