Patent ID: 6635122
Filing Date: 2003-10-21
Classification: B22F,C23C,H01F,Y10T

Abstract:
A method of preparing annealable insulated metal-based powder particles for forming compacted core components comprising:(a) providing an annealable insulating material in a coatable form wherein the annealable insulating material comprises at least one organic polymeric resin and at least one inorganic compound; (b) providing at least about 80 weight percent, based on the weight of the annealable, insulated metal-based powder particles, metal-based core particles having outer surfaces; (c) coating the metal-based core particles with a layer of a preinsulating material located on the outer surfaces of the metal-based core particles, wherein the preinsulating material comprises up to about 0.5 percent by weight, based on the weight of the metal-based core particles, and (d) coating from about 0.001 percent by weight to about 15 percent by weight, based on weight of the metal-based core particles, of the annealable insulating material onto the inner layer of preinsulating material to form a layer of the annealable insulating material surrounding the metal-based core particles; the inorganic compound of the annealable insulating material being convertible to a substantially continuous and nonporous insulating layer that circumferentially surrounds each of the metal-based core particles upon heating after compaction.