Magnetic material with core-shell structure and preparation method thereof
A core-shell structure, magnetic material technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of reducing the magnetic properties of materials, unfavorable properties, interface damage, etc., to achieve stable performance, not easy to be destroyed, close-knit effect
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Embodiment 1
[0037] 1) Raw material preparation
[0038] The raw material is gas atomized iron powder with an average diameter of 37 μm;
[0039] 2) Preparation of Fe by high temperature nitriding 4 N magnetic particles
[0040] Iron powder in NH 3 :H 2 = In a mixed atmosphere of 1:1, nitriding at 550°C for 8 hours to obtain pure Fe 4 N-phase;
[0041] 3) Preparation of Fe by high temperature nitriding 4 N / Fe 2 N core-shell magnetic particles
[0042] The Fe obtained by nitriding 4 N particles, further in NH 3 Nitriding at 400°C for 10 h in the atmosphere, and then cooling to room temperature with the furnace in an argon atmosphere to obtain Fe 4 N / Fe 2 N core-shell magnetic particles.
[0043] 4) Compression molding
[0044] Will Fe 4 N / Fe 2 N core-shell structure magnetic particles are evenly mixed with the binder PVP, and pressed under a pressure of 1.2GPa;
[0045] 5) Stress relief annealing
[0046] The pressed soft magnetic composite material is annealed and heat-treat...
Embodiment 2
[0057] 1) Raw material preparation
[0058] The raw material is gas atomized iron powder with an average diameter of 80 μm;
[0059] 2) Preparation of Fe by high temperature nitriding 4 N magnetic particles
[0060] Iron powder in NH 3 :H 2 = In a mixed atmosphere of 1:1, nitriding at 550°C for 8 hours to obtain pure Fe 4 N-phase;
[0061] 3) Preparation of Fe by high temperature nitriding 4 N / Fe 2 N core-shell magnetic particles
[0062] The Fe obtained by nitriding 4 N particles, further in NH 3 Nitriding at 400°C for 5 hours in the atmosphere, and then cooling to room temperature with the furnace in the nitrogen atmosphere to obtain Fe 4 N / Fe 2 N core-shell magnetic particles.
[0063] 4) Compression molding
[0064] Will Fe 4 N / Fe 2 N core-shell structure magnetic particles are uniformly mixed with adhesive modified epoxy resin, and pressed under 1.2GPa pressure;
[0065] 5) Stress relief annealing
[0066] The pressed soft magnetic composite material is a...
Embodiment 3
[0070] 1) Raw material preparation
[0071] The raw material is gas atomized iron powder with an average diameter of 10 μm;
[0072] 2) Preparation of Fe by high temperature nitriding 4 N magnetic particles
[0073] Iron powder in NH 3 :H 2 = In a mixed atmosphere of 1:1, nitriding at 550°C for 8 hours to obtain pure Fe 4 N-phase;
[0074] 3) Preparation of Fe by high temperature nitriding 4 N / Fe 2 N core-shell magnetic particles
[0075] The Fe obtained by nitriding 4 N particles, further in NH 3 Nitriding at 400°C for 3 hours in the atmosphere, and then cooling to room temperature with the furnace in the nitrogen atmosphere to obtain Fe 4 N / Fe 2 N core-shell magnetic particles.
[0076] 4) Compression molding
[0077] Will Fe 4 N / Fe 2 N core-shell structure magnetic particles are evenly mixed with the binder PVP, and pressed under a pressure of 1.2GPa;
[0078] 5) Stress relief annealing
[0079] The pressed soft magnetic composite material is annealed and h...
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