Patent ID: 7390579

Claim:
A rapidly solidified rare earth-transition metal-boron magnet material, comprising a coated rare earth-transition metal-boron magnet powder comprising the magnet powder and a coating formulation, wherein the coating formulation comprises a combination, in an amount by weight of the magnet powder, of about 0.1 weight percent to about 1 weight percent of an organotitanate or organozirconate coupling agent, about 0.18 weight percent to about 4.46 weight percent of an epoxy resin, about 0.01 weight percent to about 0.27 weight percent of an amine-based hardener, about 0.004 weight percent to about 0.09 weight percent of an accelerator, and about 0.003 weight percent to about 0.27 weight percent of a lubricant; wherein the general form of the coupling agent is (RO—) n (Ti or Zr)(—OR′Y) 4-n where R is a neopentyl(diallyl), dioctyl, or (2,2-diallyloxymethyl)butyl group, Ti or Zr has a coordination number of 4, R′ is a phosphito, pyrophosphato or cyclic pyrophosphato segment, and Y is a dioctyl or ditridecyl end group with 1≦n≦4.