CPC B22D 21/025 (2013.01) [H01F 1/0577 (2013.01); H01F 7/02 (2013.01); H01F 41/0253 (2013.01); C22B 9/16 (2013.01)] | 9 Claims |
1. A method for preparing a sintered Nd—Fe—B casting strip, the method comprising the following steps:
1) preparing nucleation assisted alloy particles used for the sintered Nd—Fe—B casting strip;
1.1) weighing the following nucleation assisted alloy particle elements: 26.68-28 wt % of Pr—Nd, 70-72.5% of Fe and 0.90-1% of B, wherein a Pr element in two elements of Pr—Nd accounts for 0-30 wt %, and obtaining an alloy strip with a proportion of ingredient atoms close to that of (Pr—Nd)2Fe14B through conventional compounding, smelting and pouring; and
1.2) crushing the alloy strip into particles with a diameter in the range from 1-10 mm, to serve as the nucleation assisted alloy particles used for the sintered Nd—Fe—B casting strip;
2) preparing the sintered Nd—Fe—B casting strip;
2.1) providing an intermediate material, wherein composition of the intermediate material is calculated according to the composition of the Nd—Fe—B casting strip to be prepared and an additional quantity of the nucleation assisted alloy particles, and the additional quantity of the nucleation assisted alloy particles is in the range from 3-6% by weight, based on a total weight of the sintered Nd—Fe—B casting strip; and
2.2) melting the intermediate material and smelting for 10-20 minutes to obtain a smelted intermediate material, adding the nucleation assisted alloy particles into the smelted intermediate material, further smelting for 3-15 minutes under a condition that power is reduced by 150-250 KW from a power for smelting the intermediate material, and pouring, thereby obtaining the sintered Nd—Fe—B alloy casting strip.
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