Low-temperature sintering tungstate microwave dielectric ceramic Li3R3W2O12 and preparation method thereof

Abstract

The invention discloses low-temperature sintering tungstate microwave dielectric ceramic Li3R3W2O12 and a preparation method thereof. The low-temperature sintering tungstate microwave dielectric ceramic material comprises the components of Li3R3W2O12, wherein R is one of Nd, La and Sm. The method comprises the steps of (1) weighing and dosing the original powder of Li2CO3, R2O3 and WO3, of which the purity is more than 99.9% according to the chemical formula of Li3R3W2O12, wherein R is one of Nd, La and Sm; (2) mixing the materials for 12 hours in a wet ball grinding manner, wherein the solvent is distilled water, and pre-sintering for 6 hours after baking in the atmosphere of 800 DEG C; and (3) adding a binder to the prepared powder and pelletizing, then pressing and molding, and finally sintering for 4 hours in the atmosphere of 850-900 DEG C, wherein the binder adopts polyvinyl alcohol solution of which the mass concentration is 5%; and the dosage is 3% of the total weight of the powder. The ceramic prepared by the preparation method has good sintering property at 850-900 DEG C; the dielectric constant achieves 20-22; the quality factor Qf value can be up to 57000-76000GHz; and the resonant frequency temperature coefficient is small.

Description

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

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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 3 NbO 4 , 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 microwave dielectric ceramic system that can be fired at low temperature is still relatively limited, which limits the development of low temperature co-firing technology and microwave multilayer devices to a large extent.

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