Temperature-stable type magnesium titanate base microwave dielectric ceramic

A microwave dielectric ceramic and temperature-stable technology, which is applied in the field of new temperature-stabilized magnesium titanate-based microwave dielectric ceramic materials, can solve the problems of poor temperature stability and high sintering temperature, achieve lower sintering temperature, simple preparation process and energy saving cost effect

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

[0004] The object of the invention is to overcome the poor temperature stability (τ f ~-50ppm / ℃), high sintering temperature (>1400℃), provide a new type of titanic acid with excellent microwave dielectric properties, especially the temperature coefficient of resonant frequency is close to zero, which can meet the application of high-performance microwave devices Magnesium-based temperature-stable microwave dielectric ceramic and its preparation method

Method used

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  • Temperature-stable type magnesium titanate base microwave dielectric ceramic

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Embodiment Construction

[0022] The present invention uses MgO and TiO with a purity greater than 99% 2 and La with a purity greater than 99.5% 2 o 3 、K 2 CO 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 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;

[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 900°C, and keep warm for 4 hours;

[0026] (4) La 2 o 3 、K 2 CO 3 、TiO 2 According to the stoichiometric formula (K 0.5 La 0...

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Abstract

The invention discloses temperature-stable type magnesium titanate base microwave dielectric ceramic. The target composition expression of the temperature-stable type magnesium titanate base microwave dielectric ceramic is 0.9MgTiO3-0.1(K0.5La0.5)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,La2O3, K2CO3 and TiO2 are mixed according to the stoichiometry equation(K0.5La0.5)TiO3, and presintering is carried out at 1000-1200 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 9:1 and pressed into a green body after ball milling, drying, screening and pelleting are carried out; fourthly, the green body is sintered at 1250 DEG C-1350 DEG C, and the temperature-stable type magnesium titanate base microwave dielectric ceramic is prepared. The QF value of the temperature-stable type magnesium titanate base microwave dielectric ceramic reaches 31,000-68,000 GHz, and the temperature coefficient (tao f) of resonance frequency reaches -7.9--0.7*10<-6> / DEG C. The ceramic system is simple in preparing technology and superior in microwave dielectric performance, has saved energy cost, conforms to the low-carbon environment-friendly concept and has wide application prospects.

Description

technical field [0001] The invention relates to a ceramic composition characterized by components, in particular to a novel temperature-stable magnesium titanate-based microwave dielectric ceramic material. 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, magnesium titanate (MgTiO 3 ) Ceramics, as a traditional microwave dielectric material, still have excellent microwave dielectric properties such as low dielectric constant and ultra-high quality factor in the millimeter wave band, but have poor temperature stability (τ f ~-50ppm / ℃), the disadvantage of high sintering temperature (>1400℃). [0003] Since...

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Application Information

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IPC IPC(8): C04B35/465C04B35/622
Inventor 李玲霞李赛吕笑松叶静孙浩
Owner TIANJIN UNIV
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