High-performance microwave dielectric ceramic material and preparation method thereof

Abstract

The invention relates to the technical field of electronic ceramics, in particular to a high-performance microwave dielectric ceramic material and a preparation method thereof. The material is a composite material prepared from a main crystalline phase and an auxiliary crystalline phase, wherein the main crystalline phase is LiAlO2 and the auxiliary crystalline phase is Li2TiO3. The high-performance microwave dielectric ceramic material with characteristics of quite low loss and near-zero temperature coefficient is obtained by compositing LiAlO2 and Li2TiO3; production raw materials are cheap,the technological process is simple, operation is convenient, and cost is reduced; the dielectric ceramic material has the advantages of low loss and small temperature coefficient.

Description

technical field [0001] The invention relates to the technical field of electronic ceramics, in particular to a high-performance microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of modern electronic information technology, the Internet and the Internet of Things, new electronic devices, complete machines and systems are constantly innovating and upgrading, promoting the rapid development of the electronic information industry. The rapid development of microelectronics and communication technology, the mainstay of electronic information systems, requires continuous improvement of data and energy transmission efficiency, which not only requires various electronic components to continue to develop in the direction of miniaturization, integration and multi-function, but also Higher requirements are placed on electronic packaging technology. [0003] LTCC (low temperature co-fired ceramics) technology...

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Problems solved by technology

[0004] Microwave dielectric ceramic materials are the most widely used branch of LTCC materials. The sintering temperature of general microwave dielectric ceramic materials is above 1100°C, but in order to be compatible with the LTCC low-temperature sintering process (generally between 800°C and 900°C) , the sintering temperature needs to be reduced to near or below 900°C; the commonly used methods mainly include adding low-melting oxides or glass to aid firing, introducing chemical synthesis methods, and using ultra-fine powder as raw materials; the latter two are expensive, And there are certain process limitations, so adding low-melting oxides or glass is currently the main method to realize LTCC microwave dielectric ceramic materials; but even if this method is adopted, the sintering temperature of many microwave dielectric ceramic materials is too high at present, and it is difficult to It is difficult to achieve low-temperature sintering. Secondly, the addition of too much low-melting oxide or glass will also have a great impact on the loss performance of the material, resulting in a large drop in Q×f (microwave dielectric loss); in addition, for To enable LTCC materials to be better applied in LTCC integrated devices and components, the requirements for their temperature coefficient are getting higher and higher, that is, the change of their dielectric properties with temperature should be as small as possible, so as to better ensure Stability of LTCC integrated device and component performance

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