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Stable-temperature magnesium-titanate-base microwave dielectric ceramic and preparation method thereof

A microwave dielectric ceramic and temperature-stable technology, which is applied in the field of temperature-stabilized magnesium titanate-based microwave dielectric ceramics and their preparation, can solve the problems of high sintering temperature, large energy consumption in the preparation process, non-compliance with low-carbon environmental protection and the like, and achieves the Reduced sintering temperature, superior microwave dielectric properties, and energy cost savings

Inactive Publication Date: 2015-09-30
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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  • Stable-temperature magnesium-titanate-base microwave dielectric ceramic and preparation 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 、Na 2 CO 3 and Sm 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:

[0023] (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 tank, add 200ml of deionized water, add 150g of zirconium balls, and ball 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;

[0026] (4) the chemical raw material TiO 2 , CaCO 3 、Sm 2...

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Abstract

The invention discloses a stable-temperature magnesium-titanate-base microwave dielectric ceramic and a preparation method thereof. The expression formula is 0.89MgTiO3-0.11(Ca0.4Na0.3Sm0.3)TiO3. The preparation method comprises the following steps: proportioning MgO and TiO2 according to the stoichiometric formula MgTiO3, carrying out ball milling, drying, screening, and presintering at 800-1000 DEG C; proportioning TiO2, CaCO3, Sm2O3 and Na2CO3 according to the stoichiometric formula (Ca0.4Na0.3Sm0.3)TiO3, carrying out ball milling, drying, screening and presintering at 1000-1300 DEG C; mixing the two presintered powders in a mole ratio of 89:11, carrying out ball milling, drying, screening, granulating and pressing to obtain a green compact; and sintering the green compact at 1200-1300 DEG C to prepare the magnesium-titanate-base stable-temperature microwave dielectric ceramic. The Qf value reaches 55000-72000GHz, and the temperature coefficient of resonance frequency (tau<f>) reaches -7.6 to -2.3*10<-6> / DEG C. The ceramic system has the advantages of simple preparation technique and excellent microwave dielectric properties, saves the energy cost, conforms to the concepts of low carbon and environment friendliness, and has wide application prospects.

Description

technical field [0001] The invention relates to a ceramic composition characterized by components, in particular to a temperature-stable magnesium titanate-based 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] Micro...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622C04B35/64
Inventor 李玲霞李赛吕笑松孙浩叶静
Owner TIANJIN UNIV
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