Ultra-low dielectric constant microwave dielectric ceramic zny3vo8

Abstract

The invention discloses a low-temperature sintering temperature-stable microwave dielectric ceramic ZnY3VO8 with an ultralow dielectric constant and a preparation method of the microwave dielectric ceramic ZnY3VO8. The preparation method comprises the following steps of (1) weighing initial powder of ZnO, Y2O3 and V2O5 according to the composition of ZnY3VO8, and proportioning, wherein the purities of ZnO, Y2O3 and V2O5 are larger than 99.9wt%; (2) carrying out wet-type ball milling on the raw materials in the step (1) by virtue of distilled water serving as a ball milling medium, mixing for 12 hours, and presintering in an atmospheric environment with the temperature of 900 DEG C for 6 hours after drying; and (3) adding an adhesive in the powder prepared in the step (2), granulating, then, carrying out compression molding, and finally, sintering in an atmospheric environment with the temperature of 950-990 DEG C for 4 hours, wherein the adhesive is a polyvinyl alcohol solution with the mass concentration of 5%, and the additive amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic prepared by using the preparation method can be favorably sintered at the temperature of 950-990 DEG C, has the dielectric constant of 7.3-7.9 and is high in quality factor Qf value up to 73000-96000GHz and small in temperature coefficient of resonance frequency so as to have an extremely high application value in industry.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric ceramic material used to manufacture microwave components such as dielectric substrates, ceramic resonators and filters, 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 c...

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Problems solved by technology

[0010] 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 mutual 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 individual performance and can be sintered at low temperature, and their resonant frequency temperature coefficient is usually too large or the quality factor is too low to be practically produced and applied.

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

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