Magnetic core, magnetic component, and electronic device
A magnetic core and soft magnetic technology, applied in the direction of magnetic core/yoke, magnetic objects, magnetic materials, etc., can solve the problem of powder magnetic core density difficulty
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experiment example 1
[0138] In Experimental Example 1, a soft magnetic metal powder (large particle powder) in which most of the final particles were large particles was produced by the gas atomization method. Composed of Fe 0.800 Nb 0.070 B 0.098 P 0.030 S 0.002 .
[0139] At this time, the atomization conditions were controlled so that the average particle diameter (D50) of the obtained soft magnetic metal powder on a number basis was 10.3 μm. Specifically, the injection amount of the molten metal was set at 1.2 kg / min, and the injection temperature was set at 1500° C., the gas pressure at 7.0 MPa, and the water pressure at 10.0 MPa.
[0140] Then, heat treatment is performed on the obtained soft magnetic metal powder. The heat treatment conditions were set to 600° C. for 1 hour, and the atmosphere during the heat treatment was set to an Ar atmosphere.
[0141] It was confirmed that the average particle diameter (D50) of the obtained soft magnetic metal powder was 10.3 μm on a number basi...
experiment example 2
[0159] It implemented under the same conditions as Experimental Example 1 except the point which produced various small particle powders under the conditions shown in Table 2.
[0160] 【Table 2】
[0161]
[0162] According to Table 2, the respective Examples satisfying C1<C2 have improved withstand voltage characteristics compared to the Comparative Examples which are identical to each other except for satisfying C1=C2. That is, even if C1 and C2 are changed, the withstand voltage characteristics are improved when C1<C2 is satisfied.
experiment example 3
[0164]In the sample Nos. 11, 11a, 12, and 12a of Experimental Example 3, the injection amount of molten metal and the water pressure when producing large particle powder from Sample Nos. 3 and 3a of Experimental Example 1 were changed. The specific numerical values are shown in Table 3. Then, the average circularity of the large grains in the finally obtained magnetic cores was made to the values shown in Table 3, respectively. Sample Nos. 13 and 13a of Experimental Example 3 were implemented under the same conditions except that the large particle powder was not heat-treated at 600°C for 1 hour in Sample Nos. 3 and 3a of Experimental Example 1. It was confirmed by XRD and STEM that the large particles of Sample Nos. 11, 11a, 12, and 12a had a structure composed of nanocrystals, and the large particle powders of Sample Nos. 13 and 13a had a structure composed only of amorphous. In addition, in each experimental example, it was confirmed that the area ratio of large partic...
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