Electromagnetic wave absorbing sheet and method for producing the same
A manufacturing method and electromagnetic wave technology, applied in the direction of electrical components, inorganic material magnetism, magnetic field/electric field shielding, etc., can solve the problems of limited complex magnetic permeability, unable to increase the filling factor of metal powder, and unable to obtain higher magnetic permeability, etc., to achieve Effects of price suppression and waste volume reduction
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Embodiment 1
[0129] Here, a magnetic sheet (electromagnetic wave absorbing sheet 1 ) was manufactured according to the above-mentioned steps, its characteristics were confirmed, and the results are shown.
[0130] As illustrated in the process diagram of Figure 3, as the soft magnetic metal powder, 2Mo permalloy powder (80Ni-2Mo-balance Fe (mol%)) produced by water atomization with an average particle size of about 30 μm In a media agitation mill using toluene as a solvent, the mixture was agitated and ground for 35 minutes to be pulverized and flattened to obtain a processed powder.
[0131] After making the obtained treatment powder dry, observe powder with scanning electron microscope (SEM), its observation photograph is as follows Figure 6 shown.
[0132] as the Figure 6 As shown, in the processed powder, the flat powder and the powder (referred to as unflattened powder) that maintain the shape (spherical shape) of the raw material powder are mixed.
[0133] Next, as an insulating...
Embodiment 2
[0156] As the soft magnetic metal powder, 2Mo permalloy powder (80Ni-2Mo-balance Fe(mol%)) produced by water atomization with an average particle size of about 30 μm was used in a media agitation mill using toluene as a solvent. crushed and flattened in a medium to obtain a flat soft magnetic metal powder (hereinafter appropriately referred to as "flat shape") with an average particle diameter (D50) of about 110 μm, a thickness of 0.2 to 0.6 μm, and an aspect ratio of 50 to 600. pink").
[0157] Then, the dried flat powder was subjected to an insulating film synthesis process using perhydropolysilazane (manufactured by Clariant Japan Co., Ltd., polysilazane NL110A-20) as an insulating material forming the insulating phase 13 . At this time, the amount of perhydropolysilazane added to the flat Mo permalloy powder was set to 4.5% by weight. Then, the flat Mo-permalloy powder and perhydropolysilazane were mixed for about 60 min at room temperature using a mixer. Thereafter, kee...
Embodiment 3
[0166] Next, flat powders were produced in the same manner as in Example 2, and after insulation treatment, rolling and heat treatment were performed to obtain magnetic flakes. At this time, in the rolling process, the forming density is 4.5~6.3g / cm 3 changes within the range.
[0167] In addition, regarding the heat treatment conditions, the heat treatment temperature was set at 550° C. and 580° C., two temperatures, the heat treatment time was 60 minutes, the average heating rate was 5° C. / min, and the cooling rate to 60° C. was 480 minutes.
[0168] For each magnetic sheet thus produced, the magnetic permeability at 10 MHz and 100 MHz was measured respectively, and the results are as follows Figure 14 shown.
[0169] Such as Figure 14 From the results shown, it can be confirmed that by setting the forming density in the rolling process to 5.2 g / cm 3 or above, the magnetic permeability μ at 10MHz frequency is 200 or above, and the magnetic permeability μ at 100MHz freq...
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