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Temperature-stable type low-loss microwave dielectric ceramic and preparing method thereof

A microwave dielectric ceramic and temperature-stable technology, which is applied in the field of temperature-stable low-loss microwave dielectric ceramics and its preparation, can solve the problems of high energy consumption in the preparation process, non-compliance with low-carbon environmental protection, and high sintering temperature. Excellent electrical performance, saving energy costs, and reducing the effect of sintering temperature

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

At the same time, MgTiO 3 Ceramics have a high sintering temperature, and the preparation process consumes a lot of energy, which does not meet the concept of low-carbon environmental protection

Method used

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  • Temperature-stable type low-loss microwave dielectric ceramic and preparing method thereof

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Embodiment Construction

[0022] The present invention uses MgO and TiO with a purity greater than 99% 2 , CaCO 3 、Al 2 o 3 , ZnO and La with a purity greater than 99.5% 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:

[0023] (1) MgO, TiO 2 and CaCO 3 According to the stoichiometric formula 0.95(Mg 0.97 Zn 0.03 )TiO 3 -0.05CaTiO 3 For batching, the ratio of raw materials is: 3.04025g MgO, 0.18985g ZnO, 6.54037g TiO 2 , 0.40966g CaCO 3 . Put about 10g of mixed powder into a polyester tank, 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;

[0024] (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;

[0025] (3) Put the powder sieved in step (2) into a medium-temperature furnace, pre-fire at 1100°C, and keep warm for 4 hours;

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Abstract

The invention discloses temperature-stable type low-loss microwave dielectric ceramic. The target composition expression of the temperature-stable type low-loss microwave dielectric ceramic is 0.99(0.95(Mg0.97Zn0.03)TiO3-0.05CaTiO3)-0.01LaAlO3. Firstly, MgO, TiO2, CaCO3 and ZnO are mixed according to the stoichiometry equation 0.95(Mg0.97Zn0.03)TiO3-0.05CaTiO3, and presintering is carried out at 900-1150 DEG C after ball milling, drying and screening are carried out; secondly, La2O3 and Al2O3 are mixed according to the stoichiometry equation LaAlO3, and presintering is carried out at 1100-1300 DEG C after ball milling, drying and screening are carried out; thirdly, the two kinds of powder obtained after presintering are mixed according to the mole ratio of 99:1 and pressed into a green body after ball milling, drying, screening and pelleting are carried out, the green body is sintered at 1150 DEG C-1250 DEG C, and the temperature-stable type low-loss microwave dielectric ceramic is prepared. The QF value of the temperature-stable type low-loss microwave dielectric ceramic reaches 55,000-88,500 GHz, and the temperature coefficient (tao f) of resonance frequency reaches -9.9--6.9*10<-6> / DEG C. The temperature-stable type low-loss microwave dielectric ceramic is simple in preparing technology and superior in microwave dielectric performance, saves energy cost, conforms to the low-carbon environment-friendly concept and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of electronic information materials and components, in particular to a temperature-stable low-loss 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 have become one of the most active research fields of functional ceramics in recent years. one. Among them, MgTiO 3 As a traditional microwave dielectric material, ceramics still have excellent microwave dielectric properties such as low dielectric constant and ultra-high quality factor in the millimeter wave band, but they have poor temperature stability (τ f ~-50ppm / ℃), the disadvantage of high sintering temperature (>1400℃). [0003] Since micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 李玲霞李赛高正东吕笑松孙浩
Owner TIANJIN UNIV
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