High-quality-factor temperature-stable type low-dielectric-constant microwave dielectric ceramic Cu2Mg2V2O9

Abstract

The invention discloses high-quality-factor temperature-stable type low-dielectric-constant microwave dielectric ceramic Cu2Mg2V2O9 and a preparation method thereof. The method includes the steps of firstly, weighing and preparing original powder of CuO, MgO and V2O5 with purity of 99.9% or higher by weight percentage according to the composition of Cu2Mg2V2O9; secondly, conducting wet type ball mill mixing on the raw materials in the first step for 12 hours with distilled water as the ball mill medium, and presintering the material in the air atmosphere of 750 DEG C for 6 hours after drying; thirdly, adding an adhesive to the powder prepared in the second step to be granulated, conducting pressing forming, and sintering the product in the air atmosphere of 800-850 DEG C for 4 hours, wherein a polyvinyl alcohol solution with mass concentration of 5% is adopted as the adhesive, and the addition amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared ceramic is well sintered at a temperature of 850 DEG C or lower, has the dielectric constant of 20.7-21.6, the quality factor Qf of 86000-113000 GHz and the small resonant frequency temperature coefficient and has extremely large industrial application value.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric ceramic material for manufacturing microwave components such as resonators and filters used in microwave frequencies and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands) and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Components such as chips and dielectric waveguide circuits are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are used in modern communication tools. It is playing an increasingly important role in the process of miniaturization and integration. [0003] Dielectric ceram...

AI Technical Summary

Problems solved by technology

[0009] In the process of exploring and developing new low-firing microwave dielectric ceramic materials, material systems such as Li-based compounds, Bi-based compounds, tungstate compounds and tellurate-based compounds with inherently low sintering temperatures have received extensive attention and research. However, due to the three performance indicators of microwave dielectric ceramics (ε r with Q f and τ ? ) is a mutually restrictive relationship (see literature: The restrictive relationship between the dielectric properties of microwave dielectric ceramic materials, Zhu Jianhua, Liang Fei, Wang Xiaohong, Lu Wenzhong, Electronic Components and Materials, Issue 3, March 2005), satisfying three There are very few single-phase microwave dielectric ceramics that require high performance and can be sintered at low temperature, mainly because their resonant frequency temperature coefficient is usually too large or the quality factor is too low to meet the practical application requirements.

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. Predict the microwave dielectric properties such as its resonant frequency temperature coefficient and quality factor, which largely limits the development of low temperature co-firing technology and microwave multilayer devices

Exploring and developing microwave dielectric ceramics that can be sintered at low temperature and have near-zero resonant frequency temperature coefficient (-10ppm / ℃≤τ?≤+10ppm / ℃) and high quality factor is the technology in this field A difficult problem that people have always wanted to solve but have never been able to succeed in

Images