Low dielectric constant microwave dielectric ceramic ba5znw3o15 which can be sintered at low temperature

Abstract

The invention discloses a temperature stabilization type microwave dielectric ceramic Ba5ZnW3O15 with low dielectric constant and a preparation method thereof. The method comprises the steps as follows: (1), original powder of BaCO3, ZnO and WO3 with the purity higher than 99.9% in percentage by weight is weighed and prepared according to composition of Ba5ZnW3O15; (2), raw materials in the step (1) are subjected to wet type ball milling and mixing for 12 hours, the ball milling medium is distilled water, and the mixture is pre-sintered for 6 hours in the air atmosphere at the temperature of 1,050 DEG C after dried; and (3), the powder prepared in the step (2) is added with a binding agent, pelletized, subjected to compression moulding and sintered for 4 hours in the air atmosphere at the temperature of 1,100 DEG C-1,150 DEG C finally, the binding agent adopts a polyvinyl alcohol solution with the mass concentration of 5%, and the adding amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared ceramic is well sintered at the temperature of 1,100 DEG C-1,150 DEG C, the dielectric constant reaches 29.4-30.3, the value of quality factor (Qf) is up to 67,000-92,000 GHz, the temperature coefficient of resonance frequency is small, and the ceramic has a great 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 ceramic 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] Dielectr...

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Problems solved by technology

[0009] In the process of exploring and developing new low-fire microwave dielectric ceramic materials, Li-based compounds, Bi-based compounds, tungstate system compounds and Material systems such as tellurate system compounds have been widely concerned and studied, but due to the three performance indicators of microwave dielectric ceramics (εr and 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 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 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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