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A kind of microwave dielectric ceramic and preparation method thereof

A microwave dielectric ceramic and formulation technology are applied in the field of low-loss and temperature-stable high-dielectric microwave dielectric ceramics and their preparation, which can solve the problems of difficult large-scale application and stay in the laboratory research stage, and achieve low price and good application prospects. , the effect of excellent microwave dielectric properties

Active Publication Date: 2021-04-27
无锡鑫圣慧龙纳米陶瓷技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the above studies have improved the Ba 6-3x SM 8+2x Ti 18 o 54 The dielectric properties of ceramics, but generally remain in the laboratory research stage, it is difficult to apply on a large scale

Method used

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  • A kind of microwave dielectric ceramic and preparation method thereof
  • A kind of microwave dielectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment has prepared Ba with different x values 6-3x SM 8+2x Ti 18 o 54 , and tested its dielectric constant, quality factor and resonant frequency temperature coefficient.

[0046] According to the following method, the structural formula is Ba 6-3x SM 8+2x Ti 18 o 54 (x=0, 1 / 6, 1 / 3, 1 / 2, 2 / 3, 5 / 6, 1) microwave dielectric ceramics:

[0047] (1) BaCO 3 、Sm 2 o 3 and TiO 2 Mixing, fully ball milling after mixing, drying after ball milling, sieving and putting into a corundum crucible, and then calcining at 1150°C for 4h to obtain Ba 6-3x SM 8+2x Ti 18 o 54 ;

[0048] (2) Ba obtained from step (1) 6-3x SM 8+2x Ti 18 o 54 Fully ball mill, dry, granulate, and sieve after ball milling, press the sieved particles into a cylinder with a diameter of 10mm and a height of 6mm, and then calcinate at 1340°C for 4h to obtain microwave dielectric ceramics.

[0049] The performance of gained sample is as shown in table 1:

[0050] Table 1

[0051]

[0...

Embodiment 2

[0054] This embodiment provides a microwave dielectric ceramic, the structural formula of the microwave dielectric ceramic is: a(Ba 4 SM 9.3 Ti 18 o 54 )-bMg 2 TiO 4 -cBi 2 o 3 , where a=80%, b=15%, c=5%.

[0055] Prepare the microwave dielectric ceramic according to the following method:

[0056] (1) BaCO 3 、Sm 2 o 3 and TiO 2 Mixing, fully ball milling after mixing, drying after ball milling, sieving and putting into a corundum crucible, and then calcining at 1150°C for 4h to obtain Ba4 SM 9.3 Ti 18 o 54 ;

[0057] (2) MgO and TiO 2 After mixing, fully ball mill, after ball milling, dry, sieve and put into a corundum crucible, and then calcined at 1180°C for 4h to obtain Mg 2 TiO 4 ;

[0058] (3) Ba that step (1) obtains by formula quantity 4 SM 9.3 Ti 18 o 54 , the Mg that step (2) obtains 2 TiO 4 and Bi 2 o 3 Mix, then fully ball mill, dry, granulate, and sieve after ball milling, press the sieved particles into a cylinder with a diameter of 10mm ...

Embodiment 3

[0060] This embodiment provides a microwave dielectric ceramic, the structural formula of the microwave dielectric ceramic is: a(Ba 4 SM 9.3 Ti 18 o 54 )-bMg 2 TiO 4 -cBi 2 o 3 , where a=80%, b=14%, c=6%.

[0061] The microwave dielectric ceramic was prepared according to the method in Example 2.

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Abstract

The invention relates to a microwave dielectric ceramic and a preparation method thereof. The structural formula of the microwave dielectric ceramic is: a(Ba 6‑ 3x SM 8+2x Ti 18 o 54 )‑bMg 2 TiO 4 ‑cBi 2 o 3 , where 0≤x≤1, a+b+c=100%, 75%≤a≤85%, 10%≤b≤20%, 5%≤c≤10%. The present invention by Ba 6‑3x SM 8+2x Ti 18 o 54 The material is doped and modified. On the premise of ensuring that the dielectric constant of the material does not decrease, the dielectric loss of the ceramic is reduced, and the temperature coefficient of the resonant frequency is closer to zero. The dielectric constant of the obtained microwave dielectric ceramic is >78 , the Q value (quality factor) reaches 13000-19500GHz, the temperature coefficient of resonance frequency reaches -10--1.5ppm / °C, and the raw materials are non-toxic and cheap, the preparation process is simple, and it has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics and its preparation, and in particular relates to a low-loss temperature-stable high-dielectric microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwaves usually refer to electromagnetic waves with a frequency between 300MHz and 300GHz and a wavelength between 1m and 1mm. Compared with ordinary radio waves, microwaves have high frequency, large information capacity, relatively short wavelength, low atmospheric propagation attenuation rate and high propagation directionality, and are less affected by external interference, which is conducive to the reception of weak signals. These characteristics make microwave widely researched and applied in communication, remote sensing, radar, measurement and control and other fields. Microwave dielectric ceramics developed in recent years have the advantages of low dielectric loss and small temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
CPCC04B35/50C04B35/622C04B2235/3215C04B2235/3224C04B2235/3234C04B2235/3236C04B2235/3298
Inventor 吉岸王丹王晓慧金镇龙
Owner 无锡鑫圣慧龙纳米陶瓷技术有限公司
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