Microwave dielectric ceramic Li3VO4 capable of being sintered at low temperature and preparation method thereof

Abstract

The invention discloses microwave dielectric ceramic Li3VO4 capable of being sintered at low temperature and a preparation method thereof. The dielectric ceramic material consists of Li3VO4. The preparation method comprises the following steps of: (1) weighing and dosing the raw powder of Li2CO3 and V2O5 with purity of over 99.9% according to the composition of Li3VO4; (2) performing wet-type ball milling mixing of the raw materials in step (1) for 12 hours, wherein the solvent is distilled water; and drying, and presintering for 6 hours in atmosphere at 700 DEG C; and (3) adding a binder into the powder prepared in step (2) and granulating, performing compression molding, and finally sintering for 4 hours in atmosphere at 760-790 DEG C, wherein the binder is a polyvinyl alcohol solution with mass concentration of 5%, and the dose accounts for 3% of the total amount of the powder. According to the invention, the prepared ceramic is sintered well at 760-790 DEG C, the dielectric constant reaches 17-18, the quality factor Qf is as high as 59,000-74,000GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great value in industrial application.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric substrate, a resonator, a filter and other microwave components used at microwave frequencies, as well as a dielectric ceramic material for a ceramic capacitor or a temperature compensation capacitor 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...

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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. A large number of exploratory studies have focused on Li-based binary or ternary compounds, and developed such as Li 2 TiO 3 , Li 2 MoO 4 and Li 2 MTi 3 o 8 (M=Mg or Zn) series of microwave dielectric ceramics with good performance, etc., but the low-firing ultra-low dielectric constant microwave dielectric ceramic system is still relatively limited, which largely limits the low-temperature co-firing technology and microwave multilayer device development

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