Preparation method of composite integrated inductor
A composite, inductive technology, applied in the manufacture of inductors/transformers/magnets, circuits, coils, etc., can solve the problems of difficulty in eliminating the internal stress of the inductor, the temperature limitation of alloy powder annealing, and the low production efficiency, and achieve low internal stress. , The effect of improving compactness and improving production efficiency
Pending Publication Date: 2022-03-18
湖南航天磁电科技有限公司
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This process also has certain disadvantages, because the coil is wound with flat wire, and the production efficiency is relatively low
Furthermore, the process of integrally forming inductor embedded coils limits the annealing temperature of alloy powder, because the current maximum temperature that copper wire paint film can withstand is 220°C, so the annealing temperature of integrally forming inductors will be below 200°C. In this way, it is difficult to eliminate the internal stress of the inductor due to pressing, so the loss of the inductor prepared by this method will be relatively large
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[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0013] Refer to attached figure 1 , this embodiment includes an integrated molded inductor, the size of the molded inductor (L*W*H) is 4.10*4.10*1.8mm, the DCR design requires a maximum of 14.5mΩ, and the inductance is 1.0uH. The preparation method includes the following steps:
[0014] (1) For FeSiCr powder (powder particle size is D 50 =20μm) for annealing treatment and phosphating treatment;
[0015] (2) Add acetone phosphate solution with a concentration of 15wt% of FeSiCr powder weight to FeSiCr powder, and add inorganic insulating agent kaolin, sodium silicate and organic silicon resin to insulate and coat it. 0.5wt%, 2wt% and 1wt% of FeSiCr powder weight;
[0016] (3) Dry and granulate the insulating coated powder, add 0.5wt% zinc stearate as a lubricant, and press the granulated powder into a magnetic powder core with a compression ...
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The invention provides a preparation method of a composite integrated inductor. The preparation method comprises the following steps: (1) annealing soft magnetic powder; (2) passivating the annealed soft magnetic powder and coating the annealed soft magnetic powder with high-temperature-resistant resin; (3) pressing the magnetic powder into a magnetic core, and preparing an I-shaped magnetic core through processes such as cutting and chamfering; (4) annealing the I-shaped magnetic core; (5) winding on the annealed magnetic core; (6) carrying out dispensing shielding on the wound inductor; and (7) electroplating a terminal electrode. According to the method, the magnetic powder and the I-shaped magnetic core are annealed, so that the internal stress of the powder and the magnetic core can be eliminated, the inductor with lower loss can be obtained, the prefabricated magnetic core can obtain the magnetic core with higher density, and the improvement of the magnetic performance of the inductor is facilitated.
Description
technical field [0001] The invention relates to the technical field of magnetic powder core manufacturing and inductance, and specifically relates to a preparation method of a composite integrated inductance. Background technique [0002] With the miniaturization of electronic equipment, low loss and energy saving, the requirements for electronic components such as inductors are getting higher and higher, and the electronic components such as inductors are required to have high magnetic permeability, high saturation and low eddy current at high frequencies loss and other characteristics. [0003] Generally, the integral molding inductor process is to prefabricate the coil first and then pre-embed the coil for powder filling and pressing. Since the coil is deformed under pressure, there is a certain risk of short circuit in the pressed inductor. Therefore, the pressure will not be too large during pressing molding. The pressure is between 500-800Mpa. Due to the risk of coil ...
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IPC IPC(8): H01F41/02H01F41/06
CPCH01F41/0266H01F41/06
Inventor 黄沙罗明姚锐胡盛青
Owner 湖南航天磁电科技有限公司