Low dielectric constant microwave dielectric ceramic in6mgti5o20 and preparation method thereof

Abstract

The invention discloses temperature stable type dielectric ceramic In6MgTi5O20 with a low dielectric constant and a preparation method of the temperature stable type microwave dielectric ceramic In6MgTi5O20 with the low dielectric constant. The preparation method comprises the following steps: (1) weighing and batching original powder of In2O3 with purity of 99.9wt%, MgO and TiO2 according to the composition of the In6MgTi5O20; (2) wet ball-milling and mixing the raw materials in the step (1) for 12 hours, and pre-sintering for 6 hours in an air atmosphere of 1200 DEG C after drying, wherein the ball-milling medium is distilled water; and (3) adding a binder into the powder prepared in the step (2) and pelletizing, then pressing and molding and finally sintering in the air atmosphere of 1250-1300 DEG C for 4 hours, wherein a 5wt% polyvinyl alcohol solution is adopted as the binder, the addition amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The dielectric ceramic In6MgTi5O20 with the low dielectric constant prepared by the preparation method disclosed by the invention is good in sintering performance, has a dielectric constant of 26.3-27.7, a quality factor Qf value of 84000-110000GHz, a small resonant frequency coefficient, and a great application value in the industry.

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 substrates, 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. [00...

AI Technical Summary

Problems solved by technology

[0008] 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 with individual performance requirements, mainly because their resonant frequency temperature coefficient is usually too large or the quality factor is too low to meet the practical application requirements.

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, explore and develop near-zero resonant frequency temperature coefficient (-10ppm / ℃≤τ ? ≤+10ppm / ℃) and a series of different dielectric constant microwave dielectric ceramics with higher quality factors are difficult problems that those skilled in the art have been eager to solve but have always been difficult to achieve, which largely limits the use of microwave dielectric ceramics and device development

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