Soft magnetic hexagonal ferrite compound particle and porous plate and sintering ceramics
A technology of composite particles and sintered ceramics, applied in the direction of magnetic objects, magnetic materials, iron compounds, etc., can solve the problems that the volume resistivity cannot be displayed, and the magnetic permeability of soft magnetic hexagonal ferrite sintered ceramics cannot be small.
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Embodiment 1
[0113] Example 1: Manufacture of Soft Magnetic Hexagonal Ferrite Composite Particles
[0114] Weigh α-Fe 2 o 3 、CoCO 3 and BaCO 3 , so that the resulting composition contained 18.7 mol% BaO, 11.6 mol% CoO and 69.7 mol% Fe 2 o 3 , mixed with a wet grater for 1 hour. The resulting mixture was filtered and dried. The obtained coarse mixed particles were calcined in the atmosphere at 1,250° C. for 5 hours, thereby obtaining soft magnetic hexagonal ferrite containing Z-type ferrite as the main phase. Assuming that the peak intensity of the (1016) plane of the Z-type ferrite phase is 1, it can be proved that the peak intensity of the (1013) plane of the Y-type ferrite phase is 0.54, and that of the (116) plane of the W-type ferrite phase The peak intensity is 0. Subsequently, 1.5 parts by weight of barium carbonate particles and 0.9 parts by weight of silica particles were added to 100 parts by weight of the obtained soft magnetic hexagonal ferrite, and the resulting mixture...
Embodiment 2
[0118] Embodiment 2: Manufacture of soft magnetic parts hexagonal ferrite composite particles
[0119] Weigh α-Fe 2 o 3 、CoCO 3 and BaCO 3 , so that the obtained composition contains 18.6 mol% BaO, 11.6 mol% CoO and 69.8 mol% Fe 2 o 3 , mixed with a wet grinder for 1 hour, the resulting mixture was filtered and dried, and the resulting coarse mixed particles were calcined in the atmosphere at 1,250°C for 5 hours, thereby obtaining a soft magnetic hexagonal material containing Z-type ferrite as the main phase. shaped ferrite. Assuming that the peak intensity of the (1016) plane of the Z-type ferrite phase is 1, it can be proved that the peak intensity of the (1013) plane of the Y-type ferrite phase is 0.55, and that of the (116) plane of the W-type ferrite phase The peak intensity is 0. Subsequently, 2 parts by weight of barium carbonate particles, 1 part by weight of silicon dioxide particles, 8 parts by weight of bismuth oxide particles and 3 parts by weight of copper ...
Embodiment 7
[0126] Soft magnetic hexagonal ferrite composite particles were prepared using the same method as described in Example 1, except for the composition and amount of soft magnetic hexagonal ferrite particles, mixed barium carbonate particles, strontium carbonate particles or two The average particle size, amount and BET specific surface area of silica particles vary in different ways. Fill the prepared soft magnetic hexagonal ferrite composite particles into the metal mold, in 1×10 4 t / m 2 Compression molding under certain pressure conditions to obtain a disc-shaped sample with a diameter of 30 mm and a thickness of 2.5 mm. The resulting disk-shaped sample was sintered in air at 1,250°C for 5 hours to obtain a soft magnetic hexagonal ferrite sintered ceramic. It has been confirmed that the obtained soft magnetic hexagonal ferrite sintered ceramics have 5.2×10 3 Kg / m 3 The sintered density, 1×10 9 The volume resistivity of Ωm, the imaginary part of the permeability at 400MH...
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Abstract
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