Temperature-stable type perovskite structure microwave dielectric ceramic

A technology of microwave dielectric ceramics and perovskite structure, which is applied in the field of ceramic compositions, can solve problems such as large resonance frequency temperature coefficients, and achieve the effects of reducing sintering temperature, saving energy costs, and superior microwave dielectric properties

Inactive Publication Date: 2015-10-07
TIANJIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that most of the magnesium titanate-based ceramic materials in the prior art have a relatively large negative resonance frequency temperature coefficient, and to provide a new type of high-performance temperature-stable magnesium titanate-based microwave medium Ceramic material and its preparation method

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  • Temperature-stable type perovskite structure microwave dielectric ceramic

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Embodiment Construction

[0023] The present invention uses MgO and TiO with a purity greater than 99% 2 , CaCO 3 、Na 2 CO 3 and La with a purity greater than 99.9% 2 o 3 As the starting material, microwave dielectric ceramics were prepared by a simple solid-state method. The specific implementation plan is as follows:

[0024] (1) The chemical raw materials MgO, TiO 2 According to the stoichiometric formula MgTiO 3 For batching, the ratio of raw materials is: 3.35302g MgO, 6.64698g TiO 2 . Put 10g of mixed powder into a polyester ball mill jar, add 200ml of deionized water, add 150g of zirconium balls, and mill on a planetary ball mill for 12 hours at a speed of 400 rpm;

[0025] (2) Put the ball-milled raw materials in step (1) into a drying oven, dry them at 100-120° C., and pass through a 40-mesh sieve;

[0026] (3) Put the powder sieved in step (2) into a medium-temperature furnace, pre-fire at 1100°C, and keep warm for 4 hours;

[0027] (4) TiO 2 , CaCO 3 , La 2 o 3 、Na 2 CO 3 Ac...

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Abstract

The invention discloses temperature-stable type perovskite structure microwave dielectric ceramic. The expression of the temperature-stable type perovskite structure microwave dielectric ceramic is 0.93MgTiO3-0.07(Ca0.4Na0.3La0.3)TiO3. Firstly, MgO and TiO2 are mixed according to the stoichiometry equation MgTiO3, and presintering is carried out at 800-1000 DEG C after ball milling, drying and screening are carried out; secondly,TiO2, CaCO3, La2O3 and Na2CO3 are mixed according to the stoichiometry equation (Ca0.4Na0.3La0.3)TiO3, and presintering is carried out at 900-1200 DEG C after ball milling, drying and screening are carried out; thirdly, the two kinds of powder are mixed according to the mole ratio of 93:7 and pressed into a green body after ball milling, drying, screening and pelleting are carried out; fourthly, the green body is sintered at 1200 DEG C-1300 DEG C, and the microwave dielectric ceramic is prepared. The QF value of the temperature-stable type perovskite structure microwave dielectric ceramic reaches 64,000-74,000 GHz, and the temperature coefficient (tao f) of resonance frequency reaches -5.6--2.8*10<-6> / DEG C. The ceramic system is simple in preparing technology and superior in microwave dielectric performance, has lowered sintering temperature and saved energy cost, conforms to the low-carbon environment-friendly concept and has wide application prospects.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a temperature-stable perovskite structure microwave dielectric ceramic and a preparation method thereof. Background technique [0002] With the continuous development of modern communication technology, the requirements for miniaturization, integration and modularization of components are increasingly urgent, and higher requirements are put forward for microwave dielectric materials. Microwave dielectric ceramics, especially microwave dielectric materials with perovskite structure, have become one of the most active research fields in the field of functional ceramics in recent years. Among them, MgTiO 3 As a traditional microwave dielectric material with a perovskite-like structure, ceramics still have excellent microwave dielectric properties such as low dielectric constant and ultra-high quality factor in the microwave frequency band, but have poor temperatu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/622
Inventor 李玲霞李赛吕笑松孙浩叶静
Owner TIANJIN UNIV
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