Method for preparing heavy rare earth hydride nano-particle doped sintered NdFeB permanent magnet
A nanoparticle and hydride technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of increasing production costs, prone to oxidation, deteriorating magnetic properties of magnets, etc. The effect of excellent magnetic properties
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Embodiment 1
[0021] (1) Use quick-setting technology to convert the composition into Nd 29.5 Fe 68.2 co 1.2 B 1.1 (mass percentage content) of the alloy is prepared as flakes, and then the flakes are made into raw material powders with an average particle size of 3 microns using a hydrogen crushing-jet milling process;
[0022] (2) Using physical vapor deposition technology to prepare and collect terbium hydride nanopowder with an average particle size of 10 nanometers;
[0023] (3) adding the above-mentioned terbium hydride nano-powder of 1% by weight to the raw material powder of step (1), and using a mixer to uniformly mix the two powders;
[0024] (4) Orienting and pressing the uniformly mixed powder in a magnetic field of 2.5T;
[0025] (5) Put the compact into a high vacuum sintering furnace, dehydrogenate at 950°C for 2 hours, heat up to 1100°C and sinter for 3 hours, and then perform secondary heat treatment: the first stage heat treatment temperature is 900°C, heat preservatio...
Embodiment 2
[0035] (1) Use quick-setting technology to convert the composition into Nd29.5 Fe 68.2 co 1.2 B 1.1 (mass percentage content) alloy is prepared as flakes, and then the flakes are made into raw material powders with an average particle size of 5 microns by using a hydrogen crushing-jet milling process;
[0036] (2) Using physical vapor deposition technology to prepare and collect dysprosium hydride nanopowder with an average particle size of 50 nanometers;
[0037] (3) The above-mentioned dysprosium hydride nanometer powder of 3% by weight is added in the raw material powder of step (1), utilizes mixer to carry out uniform mixing of two kinds of powders;
[0038] (4) Orienting and pressing the uniformly mixed powder in a magnetic field of 2.5T;
[0039] (5) Put the compact into a high vacuum sintering furnace, dehydrogenate at 1000°C for 0.5 hours, heat up to 1150°C for 2 hours, and then perform secondary heat treatment: the first stage heat treatment temperature is 950°C, a...
Embodiment 3
[0048] (1) Use quick-setting technology to convert the composition into Nd 29.5 Fe 68.2 co 1.2 B 1.1 (mass percentage content) alloy is prepared as flakes, and then the flakes are made into raw material powders with an average particle size of 4 microns by a hydrogen crushing-jet milling process;
[0049] (2) Using physical vapor deposition technology to prepare and collect dysprosium hydride nanopowder with an average particle size of 30 nanometers;
[0050] (3) The above-mentioned dysprosium hydride nanometer powder of 2% by weight is added in the raw material powder of step (1), utilizes mixer to carry out uniform mixing of two kinds of powders;
[0051] (4) Orienting and pressing the uniformly mixed powder in a magnetic field of 2.5T;
[0052] (5) Put the compact into a high-vacuum sintering furnace, dehydrogenate at 950°C for 3 hours, heat up to 1050°C for sintering for 4 hours, and then perform secondary heat treatment: the first stage heat treatment temperature is 8...
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