Rare earth permanent magnet and method of manufacturing the same
A rare earth permanent magnet, rare earth element technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as poor productivity
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[0055] Example 1 and Comparative Example 1
[0056] The magnet alloy is prepared as follows: Nd, Fe, and Co metals with a purity of at least 99% by weight, and iron-boron alloys are used, heated and melted at high frequency in an argon atmosphere, and then the alloy melt is poured into a copper mold. The alloy was ground on a Brown mill to a coarse powder with a particle size of at most 1 mm.
[0057] Subsequently, the coarse powder was finely pulverized into a fine powder having a mass median particle diameter of 5.2 μm on a jet mill using high-pressure nitrogen. At about 300kg / cm 2 The fine powder was compacted under the pressure of 1592kAm -1 Oriented in the magnetic field. Then, the green body was put into a vacuum sintering furnace, and it was sintered in the vacuum sintering furnace at 1060° C. for 1.5 hours to obtain a sintered compact. Using a diamond grinding tool, the sintered block was machined into a shape with a size of 4×4×2 mm on all surfaces. Wash it with alkaline...
Example
[0066] Example 2 and Comparative Example 2
[0067] The magnet alloy is prepared as follows: Nd, Fe, and Co metals with a purity of at least 99% by weight, and iron-boron alloys are used, heated and melted at high frequency in an argon atmosphere, and then the alloy melt is poured into a copper mold. The alloy was ground on a Brown mill to a coarse powder with a particle size of at most 1 mm.
[0068] Subsequently, the coarse powder was finely pulverized into a fine powder having a mass median particle diameter of 5.2 μm on a jet mill using high-pressure nitrogen. At about 300kg / cm 2 The fine powder was compacted under the pressure of 1592kAm -1 Oriented in the magnetic field. Then, the green body was put into a vacuum sintering furnace, and sintered in the vacuum sintering furnace at 1060° C. for 1.5 hours to obtain a sintered compact. Using a diamond grinding tool, the sintered block was machined into a shape with a size of 4×4×2 mm on all surfaces. Wash it with alkaline soluti...
Example Embodiment
[0077] Example 3
[0078] The magnet alloy is prepared as follows: Nd, Fe, and Co metals with a purity of at least 99% by weight, and iron-boron alloys are used, heated and melted at high frequency in an argon atmosphere, and then the alloy melt is poured into a copper mold. The alloy was ground on a Brown mill to a coarse powder with a particle size of at most 1 mm.
[0079] Subsequently, the coarse powder was finely pulverized into a fine powder with a mass median particle diameter of 5.2 μm on a jet mill using high-pressure nitrogen. At about 300kg / cm 2 The fine powder was compacted under the pressure of 1592kAm -1 Oriented in the magnetic field. Then, the green body was put into a vacuum sintering furnace, and it was sintered in the vacuum sintering furnace at 1060° C. for 1.5 hours to obtain a sintered compact. Using a diamond grinding tool, machine the sintered block on all surfaces into a shape with a size of 50×50×15mm (Example 3-1) or a shape with a size of 50×50×25mm (E...
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