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Microwave dielectric ceramics 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 improving the dielectric properties

Active Publication Date: 2019-02-12
无锡鑫圣慧龙纳米陶瓷技术有限公司
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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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  • Microwave dielectric ceramics and preparation method thereof
  • Microwave dielectric ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0045] In this example, Ba with different values ​​of x was prepared 6-3x Sm 8+2x Ti 18 O 54 , And tested its dielectric constant, quality factor and temperature coefficient of resonance frequency.

[0046] The structural formula is Ba according to the following method 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) Put BaCO 3 , Sm 2 O 3 And TiO 2 Mix, fully ball mill after mixing, dry, sieved and put into corundum crucible after ball milling, then calcined at 1150℃ for 4h to obtain Ba 6-3x Sm 8+2x Ti 18 O 54 ;

[0048] (2) The Ba obtained in step (1) 6-3x Sm 8+2x Ti 18 O 54 Fully ball milling, drying, granulating, sieving after ball milling, pressing the sieved particles into a cylinder with a diameter of 10mm and a height of 6mm, and then calcining at 1340℃ for 4h to obtain microwave dielectric ceramics.

[0049] The properties of the obtained samples are shown in Table 1:

[0050] Table 1

[0051]

[0052] After comparison, it is f...

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 ceramics according to the following method:

[0056] (1) Put BaCO 3 , Sm 2 O 3 And TiO 2 Mix, fully ball mill after mixing, dry, sieved and put into corundum crucible after ball milling, then calcined at 1150℃ for 4h to obtain Ba 4 Sm 9.3 Ti 18 O 54 ;

[0057] (2) Combine MgO and TiO 2 Mix, fully ball mill after mixing, dry, sieving and put into corundum crucible after ball milling, then calcining at 1180℃ for 4h to obtain Mg 2 TiO 4 ;

[0058] (3) According to the formula amount, the Ba obtained in step (1) 4 Sm 9.3 Ti 18 O 54 , Mg obtained in step (2) 2 TiO 4 And Bi 2 O 3 After mixing, ball milling, drying, granulating, sieving after ball milling, the sieved particles are pressed into cylinders with a diameter of 10mm and a height of 6mm, an...

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 ceramics were prepared according to the method in Example 2.

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Abstract

The invention relates to microwave dielectric ceramics and a preparation method thereof. The structural formula of the microwave dielectric ceramics is (Ba<6-3x>Sm<8+2x>Ti18O54)-Mg2TiO4-<c>Bi2O3, wherein x is larger than or equal to 0 and smaller than or equal to 1, the sum of a, b and c is 100%, a is larger than or equal to 75% and smaller than or equal to 85%, b is larger than or equal to10% and smaller than or equal to 20%, and c is larger than or equal to 5% and smaller than or equal to 10%. A Ba<6-3x>Sm<8+2x>Ti18O54 material is subjected to doping modification, under the premise that it is guaranteed that the dielectric constant of the material is not decreased, the dielectric loss of the ceramics is lowered, and the resonant frequency temperature coefficient of the ceramics iscloser to 0; according to the obtained microwave dielectric ceramics, the dielectric constant is larger than 78, the Q value (quality factor) reaches 13000-19500 GHz, and the resonant frequency temperature coefficient reaches minus 10-minus 1.5 ppm / DEG C; and raw materials are free of poison and low in price, a preparation process is simple, and the microwave dielectric ceramics and the preparation method thereof have good application prospects.

Description

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

Claims

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Application Information

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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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