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Microwave ceramic dielectric material and preparation method thereof

A technology of dielectric materials and microwave ceramics, which is applied in the field of dielectric ceramics, can solve problems such as limited applications, and achieve the effects of uniform particles, cost savings, and uniform growth

Active Publication Date: 2017-11-17
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But traditional CaTiO 3 -LNA10 3 The sintering temperature of (Ln=Nd, La, Sm) system materials is above 1450 °C, and the Qf value is 35000-45000 GHz, which largely limits their application

Method used

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  • Microwave ceramic dielectric material and preparation method thereof
  • Microwave ceramic dielectric material and preparation method thereof
  • Microwave ceramic dielectric material and preparation method thereof

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preparation example Construction

[0029] see figure 1 , the preparation method of the microwave ceramic dielectric material of an embodiment, comprises the following steps:

[0030] S110, according to the structural formula xCaTiO of the main crystal phase 3 -(1-x)LaAlO 3 The stoichiometric ratio of CaCO 3 , La 2 o 3 、TiO 2 and Al 2 o 3 The starting material is obtained, wherein, 0.68≤x≤0.72.

[0031] S120. The raw materials are wet ground and mixed, and then dried to obtain a dry powder.

[0032] Preferably, deionized water is added to the raw material, and the mass ratio of deionized water to raw material is 1:1-1:1.5, ground for 5-15 hours, and dried to obtain a dry powder. Further, grind until the particle size is 0.5-1.0 μm.

[0033] In this embodiment, zirconia balls are used as grinding media for grinding. Zirconia balls have a smooth working spherical surface, and are especially suitable for vertical stirring mills, horizontal stirring mills, vibration mills and various high-speed pin-type s...

Embodiment 1～ Embodiment 10

[0059] The composition of the main crystal phase of the microwave dielectric ceramics of Examples 1-10 is 0.68CaTiO 3 -0.32LaAlO 3 , the content of the main crystal phase, the composition and content of the modifying additive, and the composition and content of the sintering flux are shown in Table 1.

[0060] Table 1

[0061]

[0062]

[0063] The microwave dielectric ceramics of Examples 1 to 10 are made into test samples, with an Agilent network analyzer, the plate method is used to test the dielectric constant of the microwave dielectric ceramic materials whose material numbers are 1 to 10, and the Qf value and τ are tested by the closed cavity method f , and the results are shown in Table 2.

[0064] Table 2

[0065] invention material

Embodiment 11

[0067] 0.68mol of CaCO 3 , 0.16mol of La 2 o 3 , 0.68mol of TiO 2 and 0.16mol of Al 2 o 3 After mixing, add 200 mL of deionized water, use zirconium balls as the grinding medium, grind for 5 hours, and dry at 200°C to obtain a dry powder. The dry powder is raised from room temperature to 1000°C for 3 hours in a microwave sintering kiln, kept at 1230°C for 3 hours, and then lowered to room temperature to obtain the main crystal phase, whose structural formula is CaTiO 3 -(1-x)LaAlO 3 , where x=0.68.

[0068] In terms of mole percentage, 90% of the main crystal phase, 1.0% of Nb 2 o 5 , 3.7% Sm 2 o 3 , 0.3% CeO 2 , 0% Co 3 o 4 , 2.0% B 2 o 3 , 1.0% SiO 2 , 1.0% Bi 2 o 3 , 0.5% MnO and 0.5% V 2 o 5 After mixing, add 300mL deionized water, use zirconium balls as the grinding medium, grind for 5 hours to obtain the mixture, add 15g of PVA to the mixture, and spray granulate to obtain pellets; the pellets are pressed under a pressure of 10MPa to a size of 15mm× ...

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Abstract

The invention provides a microwave ceramic dielectric material and a preparation method thereof. A microwave ceramic dielectric material, comprising a main crystal phase, a modification additive and a sintering flux, the structural formula of the main crystal phase is: xCaTiO3-(1-x)LaAlO3, wherein, 0.68≤x≤0.72; according to the In terms of molar percentages in microwave dielectric ceramics, the modified additives include 0-1.0% Nb2O5, 1-5% Sm2O3, 0.1-0.5% CeO2 and 0-1% Co3O4; The sintering flux includes 0-2% of B2O3, 0.5-4% of SiO2, 0-1% of Bi2O3, 0-0.5% of MnO and 0-0.5% of V2O5 in terms of mole percentage in ceramics. The above-mentioned microwave ceramic dielectric material can be sintered at 1150° C. to 1200° C., which saves cost, and can still maintain a relatively high Qf value of 43000 GHz to 48000 GHz.

Description

technical field [0001] The invention relates to the field of dielectric ceramics, in particular to a microwave ceramic dielectric material and a preparation method thereof. Background technique [0002] Microwave ceramics are the core materials of microwave devices. In the past ten years, due to the rapid development of microwave technology and equipment towards miniaturization and integration, especially towards the large output and low price of civilian products, coupled with the great progress of electronic ceramics in the past 30 years, the microwave ceramics The rapid development of research and practical application has developed a large number of microwave ceramic dielectric materials suitable for various microwave frequency bands. Dielectric ceramics used in microwave circuits meet the dielectric constant K and resonant frequency temperature coefficient τ f Under the premise of requirements, the material is required to have a higher quality factor Q to improve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/10C04B35/468C04B35/44C04B35/50C04B35/622
Inventor 宋永生王孝国周永响伍尚伟
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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