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A Method of Improving the Thermal Shock Resistance of Magnetic Cores

A technology of anti-thermal shock and magnetic core, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of poor resistance to welding thermal shock, poor performance of inductor products, strong thermal shock, etc. Effect of Thermal Shock Properties

Active Publication Date: 2021-10-29
标旗磁电产品(佛冈)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inductor products with magnetic cores need to be metallized on the surface of the magnetic core first, and then mounted on the circuit board by soldering process after winding, because the high temperature of soldering will produce a strong instantaneous thermal shock, if the resistance of the magnetic core The thermal shock performance is not good, and the magnetic core is prone to cracking during welding, which directly leads to poor performance of inductor products and fatal defects
[0003] At present, the thermal shock resistance of nickel-zinc ferrite cores is generally poor, and the thinner the core is, the easier it is to produce cracks during welding. It is difficult for ultra-thin cores to balance excellent magnetic properties and good thermal shock resistance. performance

Method used

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  • A Method of Improving the Thermal Shock Resistance of Magnetic Cores
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  • A Method of Improving the Thermal Shock Resistance of Magnetic Cores

Examples

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Effect test

Embodiment 1

[0058] A method for improving the thermal shock resistance of a magnetic core, comprising the steps of:

[0059] 1) Preparation of glaze slurry: 5 parts by mass of borosilicate glass powder, 1 part by mass of CaO, 25 parts by mass of phenolic resin, 0.5 parts by mass of polyoxyethylene ether phosphate, 1 part by mass of polyamide wax , 0.5 parts by mass of polyether polyester modified organosiloxane, 0.5 parts by mass of polydimethylsiloxane and 66.5 parts by mass of ethanol are mixed into a corundum ball mill jar, and zirconium balls are added, ball milled for 10 hours, and passed through 300 mesh Sieve to obtain glaze slurry;

[0060] 2) Glazing: Spray the glaze slurry evenly on the magnetic core with a spray gun (the schematic diagram of the cross-section is shown in figure 1 shown) surface, then put the magnetic core into the mesh belt furnace and sinter at 850°C for 20min to form a glaze layer (thickness 2μm);

[0061] 3) Silvering: Coat both ends of the electrode surfa...

Embodiment 2

[0064] A method for improving the thermal shock resistance of a magnetic core, comprising the steps of:

[0065] 1) The borosilicate glass powder of 10 mass parts, the Al of 3 mass parts 2 o 3 , 25 parts by mass of polyvinyl butyral, 0.5 parts by mass of ammonium polyacrylate, 1 mass part of fumed silica, 0.5 parts by mass of acrylate leveling agent, 0.5 parts by mass of glyceryl oleate and 59.5 parts by mass Parts of ethanol was mixed into a corundum ball mill jar, and zirconium balls were added, ball milled for 10 hours, and passed through a 300-mesh sieve to obtain a glaze slurry;

[0066] 2) Glazing: Spray the glaze slurry evenly on the magnetic core with a spray gun (the schematic diagram of the cross-section is shown in figure 1 shown) surface, then put the magnetic core into the mesh belt furnace and sinter at 850°C for 20min to form a glaze layer (thickness 6μm);

[0067] 3) Silvering: Coat both ends of the electrode surface of the glazed magnetic core with silver p...

Embodiment 3

[0070] A method for improving the thermal shock resistance of a magnetic core, comprising the steps of:

[0071] 1) The borosilicate glass powder of 15 mass parts, the MnO of 5 mass parts 2 , the epoxy-modified acrylic resin of 25 mass parts, the ammonium polyacrylate of 0.5 mass part, the fumed silicon dioxide of 1 mass part, the acrylate leveling agent of 0.5 mass part, the olein glycerin of 0.5 mass part and 52.5 mass parts Parts of ethanol was mixed into a corundum ball mill jar, and zirconium balls were added, ball milled for 10 hours, and passed through a 300-mesh sieve to obtain a glaze slurry;

[0072] 2) Glazing: Spray the glaze slurry evenly on the magnetic core with a spray gun (the schematic diagram of the cross-section is shown in figure 1 shown) surface, then put the magnetic core into the mesh belt furnace and sinter at 850°C for 20min to form a glaze layer (thickness 10μm);

[0073] 3) Silvering: Coat both ends of the electrode surface of the glazed magnetic ...

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Abstract

The invention discloses a method for improving the thermal shock resistance of a magnetic core, which comprises the following steps: coating the glaze slurry containing borosilicate glass powder on the surface of the magnetic core, and sintering to form a glaze layer. The invention coats the glaze layer mainly composed of borosilicate glass powder on the surface of the magnetic core, and can significantly improve the thermal shock resistance of the magnetic core without affecting the electromagnetic properties of the magnetic core.

Description

technical field [0001] The invention relates to the technical field of magnetic cores, in particular to a method for improving the thermal shock resistance of magnetic cores. Background technique [0002] Chip inductors, also known as power inductors, high-current inductors and surface mount high-power inductors, have the characteristics of miniaturization, high magnetic permeability (μi), high saturation flux density (Bs), and low resistance. , Mainly used in the fields of computer, communication, power supply and consumer electronics. As consumer electronic products such as mobile phones, computers, and TVs tend to be small in size and low in thickness, the required inductance components must be further smaller and thinner, and while the components are required to be miniaturized, their DC bias characteristics are also required to remain constant. Change or even increase to ensure its use power, so it is required that the Bs of the material must be further improved to ens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/20C03C8/16C04B41/90C03C8/02H01F41/02
CPCC03C8/02C03C8/16C03C8/20C04B41/52C04B41/90H01F41/02C04B41/5022C04B41/0072C04B41/5116C04B41/5144C04B41/5161
Inventor 杨明雄向晋钰蔡达伟
Owner 标旗磁电产品(佛冈)有限公司
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