| 简介 |
R-T-B-C group rare earth alloy magnetic material comprises compound phase (CP) (I) containing preset crystal structure and CP (II). Spacing of lattice plane (LP) (d) of CP (I) is 0.214 nm and spacing of LP of CP (II) is 0.295-0.300 nm. Intensity ratio of X-ray diffraction peak of CP (II) with respect to diffraction peak of CP (I) about surface (410) is 10% or more. R-T-B-C group rare earth alloy magnetic material with R representing rare earth element comprising yttrium, T representing transition metal containing iron as main component, B and C representing boron and carbon, comprises compound phase (I) containing R 2Fe 1 4 type crystal structure and compound phase (II). The spacing of lattice plane (d) of compound phase (II) is 0.295-0.3 nm and spacing of lattice plane of compound phase (I) is 0.214 nm. The intensity ratio of diffraction peak of compound phase (II) with respect to diffraction peak of compound phase (I) about the surface (410) in X-ray diffraction spectrum is 10% or more. Independent claims are also included for the following : (i) Rare earth alloy magnetic powder obtained by grinding R-T-B-C type rare earth alloy magnetic material; (ii) Bond magnet produced using rare earth alloy magnetic powder; (iii) Permanent magnet produced using rare earth alloy magnetic powder; (iv) Manufacture of R-T-B-C type rare earth alloy magnetic material which involves quenching a molten metal of R-T-B-C type rare earth alloy and alloy is solidified. The solidified alloy is heat processed and crystallized to obtain R-T-B-C type rare earth alloy magnetic material; and (v) Manufacture of bond magnet which involves mixing rare earth alloy magnetic powder obtained from R-T-B-C type rare earth alloy magnetic material, with bonding material followed by molding the mixture. |
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