High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof
A high-strength toughness, NdFeB technology, applied in the field of high-strength toughness sintered NdFeB magnets and its preparation, can solve the problems of not meeting the application requirements, and achieve the effects of improving toughness, low cost, and simple process
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Embodiment 1
[0021] 1) Redesign of grain boundary phase alloy composition, the composition is Nd 15.3 Dy 2.4 Ti 35 Cu 13.1 al 34.2 (at%);
[0022] 2) The main phase alloy and the reconstructed grain boundary phase alloy were prepared separately. The main phase alloy is made of NdFeB ingot alloy by casting process, and its composition is Nd 13.12 Fe 80.69 B 5.73 (Dy 0.22 Ga 0.24 )(at%), reconstructed grain boundary phase alloy Nd 15.3 Dy 2.4 Ti 35 Cu 13.1 al 34.2 (at%) The quick quenching strip is made by the quick quenching process;
[0023] 3) Powder the main phase alloy and the reconstructed grain boundary phase alloy separately. The primary crushing is carried out by the jaw crusher, the secondary crushing is carried out by the secondary crusher, and then the powders with an average particle diameter of 4.3 μm and 2 μm are respectively made into powders by means of a jet mill under the protection of nitrogen;
[0024] 4) Evenly mix the reconstituted grain boundary phase ...
Embodiment 2
[0032] 1) Redesign of grain boundary phase alloy composition, the composition is Nd 12.58 Tb 2.6 co 10.13 mn 8.89 Cu 12.7 Zn 26.1 Ga 22.5 sn 4.5 (at%);
[0033] 2) Prepare the main phase alloy and the reconstructed grain boundary phase alloy separately. The main phase alloy is made of NdFeB flakes by quick-setting stripping process, and its composition is Nd 14.33 Fe 78.91 B 6 (Ga 0.36 Cu 0.2 Zr 0.2 )(at%), reconstructed grain boundary phase alloy Nd 12.58 Tb 2.6 co 10.13 mn 8.89 Cu 12.7 Zn 26.1 Ga 22.5 sn4.5 (at%) Ingot alloy made by casting process;
[0034] 3) Powder the main phase alloy and the reconstructed grain boundary phase alloy separately. The primary crushing is carried out by the jaw crusher, the secondary crushing is carried out by the secondary crusher, and then the powders with an average particle diameter of 3.5 μm and 1.5 μm are respectively made by ball milling under the protection of petroleum ether;
[0035] 4) Uniformly mix the recon...
Embodiment 3
[0043] 1) Redesign of grain boundary phase alloy composition, the composition is Nd 16.44 Ce 3.56 Nb 17.3 Ta 13.3 Si 4.4 Cu 9.7 Mg 9.7 In 5.6 al 20 (at%);
[0044] 2) The main phase alloy and the reconstructed grain boundary phase alloy were prepared separately. Both of them are made of NdFeB flakes by using the quick-setting stripping process, and their components are Nd 12.2 Fe 80.15 B 5.9 (Tb 0.31 co 1.24 Nb 0.2 )(at%) and Nd 16.44 Ce 3.56 Nb 17.3 Ta 13.3 Si 4.4 Cu 9.7 Mg 9.7 In 5.6 al 20 (at%);
[0045] 3) Powder the main phase alloy and the reconstructed grain boundary phase alloy separately. Direct crushing by hydrogen explosion method, saturated hydrogen absorption at room temperature, then dehydrogenation at 520°C for 8 hours to make hydrogen explosion powder, and finally make powders with average particle diameters of 4.5 μm and 3 μm respectively by jet mill under nitrogen protection;
[0046] 4) Evenly mix the reconstituted grain boundary pha...
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