Low-temperature sintered lead-free microwave dielectric ceramic and preparation method thereof

Abstract

The invention provides low-temperature sintered lead-free microwave dielectric ceramic and a preparation method thereof. By adopting the method, continuous adjustable dielectric constant is realized by regulating the Mg/Ca ratio of [Cax, Mg(1-x)]TiO3 powder which serves as a base material; low-temperature sintering of the ceramic material at 800-900 DEG C is realized by adding CaO-Al2O3-B2O3-SiO2 microcrystalline glass. The method comprises the following steps: firstly, synthesizing [Cax, Mg(1-x)]TiO3 ceramic powder, and synthesizing CaO-Al2O3-B2O3-SiO2 microcrystalline glass; then, performing ball-milling, dosing, tape-casting, molding and batching out, sintering and annealing to obtain a low-consumption multi-layer ceramic dielectric material with excellent performance. According to the method, the microcrystalline glass/ceramic green-compact is molded by adopting thick film tape-casting, and multiple layers of the green compact are laminated and subjected to low-temperature sintering to prepare a ceramic substrate, so that the dielectric loss can be reduced, the dielectric constant is adjustable in a range of 9-35, tan delta is less than 0.0002 under 10MHz, and tan delta is less than 0.0015 under 1-10GHz; low-temperature sintering is realized, and industrial production can be realized by combining with an Ag-Pd electrode.

Description

technical field [0001] The invention relates to a low-loss, adjustable dielectric constant low-temperature sintered lead-free microwave dielectric ceramic and a preparation method thereof, belonging to the field of ceramic materials. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency band circuits and perform one or more functions. As a new type of functional ceramics, they are widely used as microwave couplers, resonators, filters, etc. in modern communications. device. As a key material for the rapid transmission of electrical signals, the comprehensive performance of microwave dielectric materials directly determines the performance and life of electronic components. Therefore, it is of great significance to develop high-quality microwave dielectric ceramic materials in time. [0003] With the development of chips in the direction of high integration, high frequency, and large number...

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Problems solved by technology

The main methods to solve these problems in the prior art are to adjust the material system, control the firing system and annealing, add low-melting point oxides or glass, etc., but this will always take care of one thing and lose the other, and it is difficult to improve the comprehensive performance of dielectric materials, which is not conducive to electrical signals. fast transfer of

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