Method for manufacturing Sr ferrite particle for sintered magnet, method for using Sr ferrite particle, Sr ferrite sintered magnet and method for manufacturing same, and motor and generator
A technology for sintered magnets and manufacturing methods, which is applied in the direction of inductor/transformer/magnet manufacturing, magnetic objects, chemical instruments and methods, etc., to achieve the effects of excellent reliability, high magnetic properties, and excellent sinterability
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Embodiment 1-1～1-6、 comparative example 1-1～1-2
[0116] Prepare the following starting materials. Fe 2 O 3 The powder is made by spray roasting. In addition, the specific surface area is a value measured by the BET method.
[0117] ·Fe 2 O 3 Powder (specific surface area: 4.4m 2 / g)220g
[0118] ·SrCO 3 Powder (specific surface area: 5.0m 2 / g)35.23g
[0119] Use a wet ball mill to crush the above Fe 2 O 3 Powder and SrCO 3 The powder was mixed for 16 hours to obtain a slurry. The powder of the alkali metal compound shown in Table 1 was added to the slurry. The amount added at this time is relative to Fe 2 O 3 Powder and SrCO 3 The total mass of the powder is the amount shown in Table 1 (the amount of Na or K added in the table).
[0120] After that, the slurry was spray-dried to obtain a granular mixture with a particle diameter of about 10 μm. The mixture was fired in the air at the firing temperature (T1) shown in Table 1 for 1 hour to obtain a granular mixture. Sr ferrite particles. A commercially available vibrating sample...
Embodiment 2-1～2-5、 comparative example 2-1～2-2
[0128] Using a wet ball mill, the same Fe as that used in Example 1-1 2 O 3 Powder and SrCO 3 The powder was pulverized for 16 hours while being mixed to obtain a slurry. The powder of the alkali metal compound shown in Table 2 was added to the slurry. The amount added at this time is relative to Fe 2 O 3 Powder and SrCO 3 The total mass of the powder is Na 2 O is converted to 0.38% by mass.
[0129] After that, the slurry was spray-dried to obtain the mixed powder, and the mixed powder was fired in the air at the firing temperature (T1) shown in Table 2 for 1 hour to obtain granular Sr ferrite particles . A vibrating sample magnetometer was used to measure the saturation magnetization (σ) of the Sr ferrite particles obtained in each example and each comparative example. s : Emu / g). The measurement results are shown in Table 2.
[0130] (Comparative example)
[0131] Except for not adding the alkali metal compound, Sr ferrite particles were prepared in the same manner as in Examp...
Embodiment 3-1、3-2
[0141] Using a wet ball mill in the same manner as in Example 1-1, the Fe 2 O 3 Powder and SrCO 3 The powder was pulverized for 16 hours while being mixed to obtain a slurry. Sodium metasilicate powder is added to the slurry. The amount added at this time is relative to Fe 2 O 3 Powder and SrCO 3 The total mass of the powder is Na 2 O is converted into 0.42% by mass. After that, the slurry was spray-dried to obtain a granular mixture having a particle diameter of about 10 μm, and the mixture was fired in the atmosphere at 950° C. for 1 hour to obtain granular Sr ferrite particles.
[0142] The magnetic properties of the obtained Sr ferrite particles were measured in the same manner as in Example 1-1. As a result, the saturation magnetization (σ s ) Is 69.7emu / g, and the coercivity (HcJ) is 3.278kOe. In addition, the specific surface area of Sr ferrite particles is 2.7m 2 / g, the average particle size of the primary particles is 0.4 μm. Figure 5 This is an electron micrograph...
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