High dielectric microwave ceramic dielectric material and preparation method thereof

A technology of microwave ceramics and dielectric materials, applied in the field of high dielectric microwave ceramic dielectric materials and their preparation, can solve the problems of Qf decrease and high sintering temperature, and achieve the effects of simple composition, uniform particle size distribution and simple steps

Inactive Publication Date: 2015-08-26
JIANGSU UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

Chinese patent, application number 201010167964.7 discloses a composition of a LaAl x o 3 -(1-a)CaTiO 3 +ywt%MO (where MO is one or more of metal oxides, 0.30≤a≤0.35, 0.98≤x≤1.06, 0.05≤y≤2) high-Q intermediate microwave ceramics and its preparation method, its medium Electrical constant ε r =43~46, Qf≈40000GHz,τ f Stable at ±10ppm / °C, but its sintering temperature is as high as 1400-1450°C
Chinese journal "Functional Materials" 2007 Supplement 38 in "La 3+ , Li 1+ to CaTiO 3 Influence of Microwave Dielectric Properties" discloses a composition of (1-y) Ca 1-x La 2x / 3 TiO 3 -yLi 1 / 2 Nd 1 / 2 TiO 3 microwave ceramic materials, although when x=0.4 and y=0.5, ceramics have better comprehensive microwave dielectric properties (τ f Reduced to within 10ppm / ℃, ε r higher than 100), but its Qf drops significantly below 1400GHz

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  • High dielectric microwave ceramic dielectric material and preparation method thereof
  • High dielectric microwave ceramic dielectric material and preparation method thereof
  • High dielectric microwave ceramic dielectric material and preparation method thereof

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Embodiment 1

[0023] The chemical formula of the material is 0.85(Sm 0.5 Li 0.5 )TiO 3 -0.15CaTiO 3 , to calculate CaCO 3 , Li 2 CO 3 、Sm 2 o 3 、TiO 2 The ratio of the amount of the substance is 0.15:0.2125:0.2125:1, weigh the CaCO after drying at 180°C 3 , Li 2 CO 3 and Sm dried at 900°C 2 o 3 、TiO 2Each 0.03mol, 0.0425mol, 0.0425mol, 0.2mol, put the ingredients, zirconia balls and propanol in a mass ratio of 1:4:2 into a ball mill jar, wet ball mill in a double-roller ball mill for 16 hours, and the slurry After the material is dried, it is sieved through a 250 μm nylon sieve. The powder is placed in a mullite crucible and covered, and the heating rate is controlled from 5°C / min to 1100°C for 3 hours, and the rate is cooled to room temperature at a rate of 10°C / min. Put the main crystal phase powder, zirconia balls and propanol in a mass ratio of 1:4:2 into a ball mill jar again, wet ball mill in a double-roller ball mill for 16 hours, and pass through a 250 μm nylon sieve a...

Embodiment 2

[0026] The chemical formula of the material is 0.8(Sm 0.5 Li 0.5 )TiO 3 -0.2CaTiO 3 , to calculate CaCO 3 , Li 2 CO 3 、Sm 2 o 3 、TiO 2 The ratio of the amount of the substance is 0.2:0.2:0.2:1, weigh the CaCO after drying at 180°C 3 , Li 2 CO 3 and Sm dried at 900°C 2 o 3 、TiO 2 Each 0.04mol, 0.04mol, 0.04mol, 0.2mol. The ingredients, zirconia balls and propanol are put into a ball mill tank at a mass ratio of 1:4:2, wet ball milled in a double-roller ball mill for 14 hours, and the slurry is dried and sieved through a 250 μm nylon sieve. Put it in a mullite crucible and cover it, control the heating rate of 5°C / min to 1095°C for calcination for 3 hours, and cool to room temperature at a rate of 10°C / min. Put the main crystal phase powder, zirconia balls and propanol in a mass ratio of 1:4:2 into a ball mill jar again, wet ball mill in a double-roller ball mill for 14 hours, and pass through a 250 μm nylon sieve after the slurry is dried Sieve, molded under a p...

Embodiment 3

[0029] The chemical formula of the material is 0.82(Sm 0.5 Li 0.5 )TiO 3 -0.18CaTiO 3 , to calculate CaCO 3 , Li 2 CO 3 、Sm 2 o 3 、TiO 2 The ratio of the amount of the substance is 0.18:0.205:0.205:1, weigh the CaCO after drying at 180°C 3 , Li 2 CO 3 and Sm dried at 900°C 2 o 3 、TiO 2 Each 0.036mol, 0.041mol, 0.041mol, 0.2mol. Put the ingredients, zirconia balls and propanol into a ball mill tank at a mass ratio of 1:4:2, wet ball mill for 18 hours in a double-roller ball mill, and sieve the slurry through a 250 μm nylon sieve after drying. Put it in a mullite crucible and cover it, control the heating rate of 5°C / min to 1090°C for calcination for 3 hours, and cool to room temperature at a rate of 10°C / min. Put the main crystal phase powder, zirconia balls and propanol in a mass ratio of 1:4:2 into a ball mill jar again, wet ball mill in a double-roller ball mill for 16 hours, and pass through a 250 μm nylon sieve after the slurry is dried Sieve, molded under ...

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Abstract

The invention discloses a high dielectric microwave ceramic dielectric material and a preparation method thereof. The material has the following formula: (1-x) (Sm0.5Li0.5) TiO3-xCaTiO3, wherein x uses the mole fraction and satisfies the relation of 0.15<=x<=0.20; and the material is prepared from the main raw materials of CaCO3, Li2CO3, TiO2 and Sm2O3. The preparation method of the high dielectric microwave ceramic dielectric material is as below: adding the raw materials to a mill pot, conducting wet milling for 14-18 h, baking, sieving, calcining at 1090-1110 DEG C for 2-3 h, and carrying out a solid state reaction to synthesize a principal crystalline phase powder; cooling the principal crystalline phase powder, adding the principal crystalline phase powder into the mill pot, conducting wet milling again for 14-18 h, drying, sieving, and conducting compression molding at pressure of0.4 to 0.5 tons to obtain a cylindrical base substrate; placing the base substrate in a alumina square porcelain boat with a platinum foil pad, burning with cover at 1290-1300 DEG C for 2-3 h into a porcelain, so as to obtain the final product. The invention provides a high dielectric microwave ceramic dielectric material, which has high microwave dielectric constant epsilon r while ensuring a low resonant frequency temperature coefficient tau f.

Description

technical field [0001] The invention relates to a high-dielectric microwave ceramic dielectric material applied to microwave devices and a preparation method thereof, belonging to the technical field of microwave ceramic dielectric materials. Background technique [0002] Microwave ceramic dielectric material is a kind of rapidly developing functional ceramic material. It is the key material of microwave components such as microwave resonator, filter, duplexer and microwave antenna. Development plays a vital role. [0003] The main index for evaluating the performance of microwave dielectric ceramics is the dielectric constant ε r , the product Qf of the quality factor Q and the resonant frequency f, the resonant frequency temperature coefficient τ f . Among the reported high dielectric microwave ceramic materials, CaTiO 3 ε r Up to 170, Qf about 3600GHz, τ f It is +800ppm / ℃, and its sintering temperature is around 1300℃. To be in CaTiO 3 The near-zero temperature co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 张晨马士才
Owner JIANGSU UNIV OF SCI & TECH
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