| 摘要 |
PCT No. PCT/GB93/01476 Sec. 371 Date Apr. 5, 1995 Sec. 102(e) Date Apr. 5, 1995 PCT Filed Jul. 15, 1993 PCT Pub. No. WO94/02950 PCT Pub. Date Feb. 3, 1994A method for the preparation of a two-phase magnetic material that includes as the major phase a crystalline alloy of one or more rare earth metals, boron and iron, substantially all of the crystallites of which have a size of less than 35 nanometers, and as the minor phase alpha -Fe, involves the steps of (i) melt spinning an alloy consisting of up to 12 atomic percent of one or more rare earth metals, 3 to 7 atomic percent of boron and the balance iron or a mixture of iron and cobalt; (ii) quenching the melt spun alloy form step (i) under conditions such that a mixture of crystalline and amorphous material is produced, (iii) subjecting the material from step (ii) to an annealing treatment under conditions such that controlled crystal growth occurs to provide the crystalline alloy phase, substantially all of which has a particle size of less than 35 nanometers, the resulting materials having a remanence in excess of the theoretical value of 0.8 Tesla. |
