Preparation method of sintered NdFeB magnet with high coercivity
A high coercive force, neodymium iron boron technology, applied in the direction of magnetic objects, inductors/transformers/magnets manufacturing, magnetic materials, etc., can solve the problems of insignificant coercive force improvement, difficult mass production, and low production efficiency. Achieve the effects of improving coercive force, improving magnetic properties and saving energy
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Embodiment 1
[0024] The NdFeB main alloy composition Nd11.76Fe82.36B5.88 (atomic percentage) and the auxiliary alloy composition Dy75Cu25 (atomic percentage) based on the 2:14:1 phase were respectively designed, and the ingredients were distributed according to the design, and the main alloy considered the rare earth Nd Burning loss 3% (percentage by weight), supplementary alloy considers burning loss 5% (percentage by weight) of rare earth Dy, puts the metal raw material that purity is 99.9wt% into high-vacuum smelting furnace and melts into ingot, and the control vacuum degree is 10 -3 Pa, the smelted alloy ingots were put into the hydrogen breaking furnace respectively, the hydrogen flow was 70ml / min, the reaction was 4 hours, and then the jet mill was 2 hours to prepare the main alloy powder and the auxiliary alloy powder with the average particle size of 3.5μm and 1.5μm respectively. Alloy powder, add auxiliary alloy powder with a weight fraction of 2% to the main alloy powder, mix the...
Embodiment 2
[0026] The NdFeB main alloy composition Nd8.82Pr2.94Fe80.00Co1.36Zr1.00B5.88 (atomic percentage) and the auxiliary alloy composition Dy75Al25 (atomic percentage) based on the 2:14:1 phase were respectively designed, and the ingredients were distributed according to the design, where The main alloy considers the burning loss of rare earth Nd 3% (weight percentage), the auxiliary alloy considers the burning loss of rare earth Dy 5% (weight percentage), and the metal raw material with a purity of 99.9wt% is put into a high vacuum melting furnace and melted into an ingot , the control vacuum is 10 -3 Pa, the smelted alloy ingots were put into the hydrogen breaking furnace respectively, the hydrogen flow was 72ml / min, the reaction was 5 hours, and then the jet mill was 3 hours to prepare the main alloy powder and the auxiliary alloy powder with the average particle size of 3.0μm and 1.2μm respectively. Alloy powder, add auxiliary alloy powder with a weight fraction of 2% to the mai...
Embodiment 3
[0028] The NdFeB main alloy composition Nd8.82Pr2.94Fe81.3Al1.00B5.88 (atomic percent) and the auxiliary alloy composition Dy75Tb15Cu10 (atomic percent) based on the 2:14:1 phase were respectively designed, and the ingredients were distributed according to the design, of which the main alloy Consider the burning loss of rare earth Nd 3% (percentage by weight), auxiliary alloy consider the burning loss of rare earth Dy / Tb 5% (percentage by weight), put the metal raw material with a purity of 99.9wt% into a high vacuum melting furnace and melt it into an ingot , the control vacuum is 10 -3 Pa, the smelted alloy ingots were put into the hydrogen breaking furnace respectively, the hydrogen flow was 74ml / min, the reaction was 6 hours, and then the jet mill was 4 hours to prepare the main alloy powder and the auxiliary alloy powder with the average particle size of 2.5μm and 1.0μm respectively. Alloy powder, add auxiliary alloy powder with a weight fraction of 5% to the main alloy p...
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