High-quality-factor microwave dielectric ceramic material and preparation method thereof

Abstract

The invention discloses a high-quality-factor microwave dielectric ceramic material and a preparation method thereof. A structural expression formula of the ceramic material is (1-y)Ca2Na6Al6Si6O24(XO4)2-yTiO2, wherein y is greater than or equal to 0.07 and less than or equal to 0.16, and X is one of S, Mo and W. The material is prepared through a traditional high-temperature solid-phase synthesismethod; a small amount of dispersant is added in a secondary ball milling process, and then the material is subjected to ultrasonic vibration under a hot environment, so that powder particles of a sample are not easy to agglomerate. The material prepared by the preparation method is sintered well at 1075 DEG C to 1125 DEG C and has the characteristics that the dielectric constant is 8.5 to 10.6,the quality factor Qf value reaches 78600GHz to 117000GHz and the resonant frequency temperature coefficient is small. Meanwhile, the invention discloses Ca2Na6Al6Si6O24(XO4)2 (X is one of S, Mo and W) ceramic with a hauynite structure for the first time, and the ceramic has good microwave dielectric performance.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric ceramic material used for manufacturing microwave components such as ceramic substrates, resonators and filters used in microwave frequencies and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of microwave mobile communication technology towards high frequency and digitization, the requirement for modularization of components is becoming more and more urgent. Low Temperature Co-fired Ceramics (LTCC) requires microwave dielectric materials with excellent performance, low sintering temperature (≤900°C), and compatibility with Ag electrode co-firing, which makes it an electronic device module one of the main technologies of The sintering temperature of the current commercial microwave dielectric ceramic material systems is generally higher than 1300 °C, and cannot be directly co-fired with low melting point m...

AI Technical Summary

Problems solved by technology

At present, most of the research on microwave dielectric ceramics is a summary of experience obtained through a large number of experiments, but there is no complete theory to explain the relationship between microstructure and dielectric properties, and it is impossible to predict theoretically from the composition and structure of compounds. Its microwave dielectric properties such as resonant frequency temperature coefficient and quality factor

More importantly, the preparation process of microwave dielectric ceramic materials is also one of the main factors affecting the microwave dielectric properties of materials. From commercialized microwave dielectric ceramics to recent microwave dielectric ceramic materials with better comprehensive microwave dielectric properties, the main The preparation method is through the high-temperature solid-phase synthesis method. This is because the method is mature in technology, simple in process and high in production efficiency. Compared with sol-gel method, hydrothermal method, etc., it is more feasible in industrial production Operability and economic value, but the inherent shortcomings of high-temperature solid-phase synthesis, such as high energy consumption and easy agglomeration of particles after ball milling, should still attract sufficient attention in this field