A kind of magnetic composite material forming pcb embedded inductance magnetic core and its preparation method and application

Abstract

The invention discloses a magnetic composite material, a preparation method and its application as a magnetic core in PCB embedded inductance, belonging to the field of printed circuit manufacturing. The magnetic composite material in the present invention includes a mass fraction of 5% to 90% ferrite and a mass fraction of 10% to 95% polyphenylene ether resin; the preparation of the magnetic composite material firstly carries out surface modification treatment on the ferrite, Then mix it with polyphenylene ether resin solution, heat and volatilize the solvent to obtain a slurry-like magnetic composite material, prepare a magnetic core by printing the slurry-like magnetic composite material, or prepare a magnetic core by pressurizing the slurry-like magnetic composite material after solidification , so as to realize the application of magnetic composite materials as magnetic cores in PCB embedded inductor technology. The invention can overcome the problems of unstable inductance and lowered reliability caused by inconsistent thermal expansion coefficients of traditional magnetic core materials and printed circuit board materials; the manufacturing method is simple, and has advantages in terms of energy saving and manufacturing efficiency.

Description

technical field [0001] The invention belongs to the field of printed circuit manufacturing, and in particular relates to a magnetic composite material forming a PCB embedded inductance magnetic core, a preparation method thereof, and its use and application as a magnetic core in a PCB embedded inductance. Background technique [0002] With the development of wireless communication, automotive electronics and other consumer electronics products in terms of multi-function, miniaturization, portability, high speed, low power consumption and high reliability, integrated circuits are gradually integrating chips, micro sensors, micro actuators and Various passive components such as resistors, capacitors, inductors, filters, couplers, etc. are integrated into one package, which is called system-in-package technology. In electronic products, inductors are one of the important components for high frequency and microwave frequency signal transmission and processing. Traditional induc...

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Problems solved by technology

BangD H et al. in the literature "Ni-Zn ferrite screen printed power inductors for compact DC-DC power converter applications" ("Ni-Zn ferrite screen printed power inductors and its application in DC-DC power converters") and Sugawa Y et al. in the literature "Carbonyl-iron / epoxy composite magneticcore for planar power inductor used in package-level power grid" ("Carbonyl iron / epoxy composite magnetic core for planar power inductor used in package-level power grid" ) respectively use Ni-Zn ferrite and polyimide, carbonyl iron and epoxy resin to make magnetic composite materials, and then use screen printing to cover a layer of magnetic composite materials on the upper and lower layers of the inductance coil and then make embedded embedding. Magnetic core inductance; the polyimide resin used in the above method has high hygroscopicity, and the epoxy resin has poor aging resistance and moisture resistance, and the above method prints the magnetic material on the surface of the inductance coil, which can only enhance the inductance in the plane direction. The inductance of the magnetic core is low and the inductance error is large

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