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Stable-temperature medium-temperature-sintering microwave dielectric ceramic and preparation method thereof

A microwave dielectric ceramic and temperature-stable technology, which is applied in the field of temperature-stable medium-temperature sintering low-loss microwave dielectric ceramics and their preparation, can solve the problems of high sintering temperature, low dielectric constant, poor temperature stability and the like, and achieve a simple preparation process. , The effect of saving energy cost and low loss

Inactive Publication Date: 2015-09-30
TIANJIN UNIV
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Problems solved by technology

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℃)

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  • Stable-temperature medium-temperature-sintering 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 、Al 2 o 3 , ZnO and La with a purity greater than 99.5% 2 o 3 , B 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 0.93MgTiO 3 -0.07CaTiO 3 For batching, the ratio of raw materials is: 3.08992g MgO, 6.558647g TiO 2 , 0.57756g 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 dried and sieved powder into a medium-temperature furnace, pre-fire at 1100°C, and keep it warm for 4 hours;

[0026] (4) La 2 o...

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Abstract

The invention discloses a stable-temperature medium-temperature-sintering microwave dielectric ceramic and a preparation method thereof. The preparation method comprises the following steps: proportioning MgO, TiO2 and CaCO3 according to the stoichiometric formula 0.93MgTiO3-0.07CaTiO3, carrying out ball milling, drying, screening and presintering at 900-1150 DEG C; proportioning La2O3 and Al2O3 according to the stoichiometric formula LaAlO3, carrying out ball milling, drying, screening and presintering at 1100-1300 DEG C; and mixing the two presintered powders in a mole ratio of 99:1, adding 1-3 wt% of ZnO and 1-3 wt% of B2O3, carrying out ball milling, drying, screening, granulating, compacting into a green compact, and sintering at 1075-1175 DEG C to prepare the stable-temperature medium-temperature-sintering microwave dielectric ceramic. The Qf value is up to 33000-57000 GHz, tau<f> reaches -9.1 to -2.6 ppm / DEG C, and the optimal sintering temperature is lowered to 1125 DEG C. The stable-temperature medium-temperature-sintering microwave dielectric ceramic has the advantages of simple preparation technique and excellent microwave dielectric properties, 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 medium-temperature sintered 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 (>...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/64
Inventor 李玲霞李赛高正东吕笑松孙浩
Owner TIANJIN UNIV
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