Microwave dielectric ceramic material with high magnetic conductivity and preparation method thereof

Abstract

The invention relates to a microwave dielectric ceramic material with high magnetic conductivity and a preparation method thereof. The ceramic material comprises a complex system (1-x)A(GazNb1-z)yTi1-yO3/(x)B(MnO4) composed of a main body A(GazNb1-z)yTi1-yO3 and a complex B(MnO4)3 wrapping the main body, wherein x is more than or equal to 0.20 mol but less than or equal to 0.50 mpl, and y is morethan or equal to 0.50 mol but less than or equal to 1.00 mol; A in the main body is one or more of Ni, Zn, Pb or Co; and B in the complex is one or more of Y, Yb, Fe, Ce, La or Lu. The preparation method of the microwave dielectric ceramic material provided by the invention adopts a microwave assisted sintering method, and the microwave dielectric ceramic material prepared by the method has a bimorphic crystal structure and a good microwave absorption property, and is low in electromagnetic loss, low in dielectric constant, high in magnetic conductivity and high in sintering speed.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a microwave dielectric ceramic material with high magnetic permeability and a preparation method thereof. Background technique [0002] Due to its good directionality, strong penetrating power and large amount of information, microwave has been widely used in communication, measurement and control, remote sensing and other fields. With the continuous development of microwave communication technology in recent years, especially the rapid progress in personal mobile communication (PMC), satellite communication (SATCOM), global positioning system (GPS), wireless local area network (WLAN) and other fields, microwave communication technology It has become an important part of modern communication technology. Microwave dielectric ceramics are the basic materials for manufacturing core components of microwave communication equipment, and their various performance indicators restrict the...

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Problems solved by technology

[0004] Due to the importance of equipment miniaturization to modern communication systems, low-temperature sintering technology has been widely used in the production of microwave ceramic materials. Although traditional microwave ceramic materials have excellent dielectric properties, their sintering temperature is too high and thus unsuitable. Produced by low-temperature sintering technology, although low-temperature glass and oxides are added to the material of the microwave ceramic material, it also reduces the dielectric properties of the microwave ceramic material; on the other hand, the gap between the microwave dielectric ceramic material and the silver electrode The chemical compatibility of low-temperature sintering technology is very important, so new microwave dielectric ceramic materials lower than the melting point of silver electrodes (961 ° C) need to be researched and developed urgently

[0005] Chinese patent 201910015547.1 discloses a Li-based microwave dielectric ceramic material and its preparation method. The microwave dielectric ceramic material produced by the preparation method has low dielectric constant, high quality factor, high relative density and low densification temperature. Excellent characteristics, but its sintering temperature is still maintained at 1120 ° C ~ 1160 ° C, which is higher than the melting point of silver electrode 961 ° C, and it is necessary to add a small amount of sintering aid to achieve a sintering temperature lower than 961 ° C, and the sintering technology used It is still a technology of high-temperature solid-phase sintering after ball milling using oxide raw materials. The production efficiency is low, and the microscopic crystal morphology of the finished product is poor, which indirectly affects the electrical properties of ceramic materials; although the substitute material NiO is used in the production materials, it is only Substitution of Ni can neither reduce the dielectric constant nor increase the magnetic permeability of the ceramic material, thereby reducing the microwave absorption performance of the ceramic material and improving the reluctance of the ceramic material, thereby increasing the electromagnetic loss.