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Preparation method of dielectric ceramic material

A technology for dielectric ceramics and powders, which is applied in the field of preparation of dielectric ceramic materials, can solve the problems of limited application, difficult application, and difficulty in meeting demands, and achieves the effect of low sintering temperature and high Qf

Pending Publication Date: 2022-01-18
无锡市惠丰电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing dielectric ceramic materials with medium dielectric constant are mainly CaTiO3-NdAlO3 system. On the one hand, the price of Nd2O3 raw materials is relatively expensive, which limits its application.
On the other hand, its dielectric constant is 43-48, and it is difficult to apply to occasions with a medium dielectric constant of 39-42.
And the existing medium dielectric constant dielectric ceramic material, the quality factor Q f Usually it can only reach about 40000GHz, which is difficult to meet the demand

Method used

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  • Preparation method of dielectric ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]A method for preparing a dielectric ceramic material, comprising the steps of:

[0041] Step S1: Use an electronic balance to weigh 407g ZnO powder, 512g Al 2 o 3 Powder, 77g TiO2 powder, 4gMnO 2 .

[0042] Step S2: Put the weighed powder into a ball mill, and then add 800 g of deionized water, and grind various raw materials into a slurry with a particle size of 0.9 μm. Most of the water in the slurry is squeezed out by filter press. Dry the slurry after pressure filtration, and then crush and sieve to obtain a powder with a particle size of less than 0.2mm. The powder is pre-fired, the pre-fire temperature is 1150°C, the pre-fire time is 5h, and the primary powder is obtained after pre-fire.

[0043] Step S3: Perform secondary mixing of the primary powder: add the primary powder and 50% deionized water equal to the weight of the primary powder into the ball mill, and use the ball mill to grind into a slurry with a particle size of 1.3 μm. The obtained slurry was ...

Embodiment 2

[0046] A preparation method of a dielectric ceramic material, except that the sintering temperature is 1330° C. in the experimental steps, the rest are the same as in Example 1.

Embodiment 3

[0048] A preparation method of a dielectric ceramic material, except that the sintering temperature is 1360° C. in the experimental steps, the rest are the same as in Example 1.

[0049] Table 1. Performance data of experimental samples of the same size

[0050] Example number εr Qf / GHz ppm / °C Sintering temperature / ℃ Comparative example 1 8.5 145688 -79 1450 Comparative example 2 11.56 139582 -12.6 1350 Comparative example 3 12.18 122549 -5 1350 Example 1 11.89 90886 25.6 1300 Example 2 12.26 126035 0.2 1330 Example 3 12.32 118879 6.3 1360

[0051] Microwave dielectric ceramic is a dielectric material used in the microwave frequency band. Under the action of an external electric field, its plan strength changes, and electric energy is transmitted and stored in an inductive manner. In recent years, the rapid progress of information processing technology and electronic information digitization technology...

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Abstract

The invention discloses a preparation method of a dielectric ceramic material, and relates to the field of ceramic materials. The preparation method comprises the steps of S1, weighing the following raw materials in percentage by weight: 38-45% of zinc oxide, 48-56% of aluminum oxide, 6-12% of titanium dioxide and 0.1-1% of manganese oxide; S2, carrying out primary treatment on the weighed powder to obtain primary powder, wherein the primary treatment process comprises primary mixing, filter pressing, drying and presintering treatment; S3, carrying out secondary treatment on the primary powder to obtain secondary powder, wherein the secondary treatment process comprises secondary mixing and granulation treatment; and S4, enabling the secondary powder to be subjected to forming treatment, and obtaining a blank, and after the blank is subjected to plastic removal treatment, sending the blank to a sintering furnace for sintering treatment, wherein the sintering temperature ranges from 1260 DEG C to 1300 DEG C, the sintering time ranges from 2 h to 4 h, and finally the dielectric ceramic material is obtained. The dielectric ceramic material disclosed by the invention has relatively high Qf, has a temperature coefficient close to 0 and is low in sintering temperature.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a method for preparing a dielectric ceramic material. Background technique [0002] Dielectric ceramic materials are a new type of functional ceramic materials developed rapidly in recent years, with low microwave loss, high dielectric constant and dielectric constant temperature coefficient τ f Stability and other characteristics. Used as a dielectric material in microwave frequency band circuits, it is the core basic material of new microwave circuits and devices including dielectric resonators, filters, oscillators, duplexers, antennas, dielectric substrates, etc., and is widely used in modern microwave communications. and satellite navigation systems and equipment. The dielectric resonator has resonance properties when it works in a narrow frequency band. It is an electromagnetic component. It is generally composed of a ceramic cylinder with a high dielectric constant and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/64
CPCC04B35/10C04B35/622C04B35/64C04B2235/3232C04B2235/3284C04B2235/3267C04B2235/6562C04B2235/6567C04B2235/96
Inventor 田德辉
Owner 无锡市惠丰电子有限公司
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