Temperature stable ultra-low dielectric constant microwave dielectric ceramic nb2vy3o12

Abstract

The invention discloses a temperature stable type microwave dielectric ceramic Nb2VY3O12 with an ultralow dielectric constant as well as a preparation method thereof. The preparation method comprises the following steps: (1) weighing and blending original powder of Nb2O5, V2O5 and Y2O3 with the purity over 99.9% (weight percentage) according to composition of Nb2VY3O12; (2) mixing the raw material in the step (1) for 12 hours by a wet ball-mill, wherein the ball-milling medium is distilled water; and drying and pre-calcining for 6 hours in the atmosphere of 850 DEG C; and (3) adding an adhesive into the powder prepared in the step (2) and granulating, then compressing and moulding, and finally, sintering for 4 hours in the atmosphere of 910-940 DEG C; and the adhesive is a 5% polyvinyl alcohol solution, and the additive amount of polyvinyl alcohol accounts for 3% of total weight of the powder. The ceramic prepared by the invention is well sintered at 910-940 DEG C, the dielectric constant reaches 8.1-8.7, the quality factor Qf value reaches 79000-94000GHz, and the temperature coefficient of resonance frequency is small. The temperature stable type microwave dielectric ceramic Nb2VY3O12 has huge application value industrially.

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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