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A microwave dielectric ceramic with ultra-high quality factor, medium and low dielectric constant and near-zero temperature coefficient and its preparation method

A technology of microwave dielectric ceramics and dielectric constant is applied in the field of microwave dielectric ceramics to achieve the effect of low loss, extreme loss and meeting the needs of communication.

Active Publication Date: 2020-06-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] MgO-Ta 2 o 5 In the binary system, the stable phase MgTa 2 o 6 Has a high quality factor Qf value, medium and low dielectric constant ε r and a positive resonant frequency temperature coefficient τ f (Qf=60000GHz, ε r =24,τ f =30ppm / ℃) cannot meet actual needs

Method used

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  • A microwave dielectric ceramic with ultra-high quality factor, medium and low dielectric constant and near-zero temperature coefficient and its preparation method
  • A microwave dielectric ceramic with ultra-high quality factor, medium and low dielectric constant and near-zero temperature coefficient and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) MgO, Ta 2 o 5 , Nb 2 o 5 Weigh according to molar ratio 2.5:0.5:0.5, 2.6:0.5:0.5, 2.7:0.5:0.5 respectively, and then add equivalent 1wt% B 2 o 3 H 3 BO 3 , add zirconia balls and deionized water. Ball mill for 1 to 2 hours, and dry the ball-milled raw materials in a drying oven;

[0026] (2) Calcining the uniformly mixed powder at 1100°C for 4 hours;

[0027] (3) put the raw material calcined in step (2) into a ball mill jar and add zirconia balls and deionized water, ball mill for 1 to 2 hours, dry, and add a mass fraction of 3% PVA ( Polyvinyl alcohol) is used as binder granulation, and is pressed into cylindrical green body;

[0028] (4) Sinter the cylindrical green body at 1250°C-1300°C for 4 hours to obtain the required low-loss temperature coefficient magnesium tantalate-based microwave dielectric ceramics;

[0029] (5) Use a network analyzer and a resonant cavity to test the microwave dielectric properties of the low-loss temperature coefficient nea...

Embodiment 2

[0034] Following Example 1, on the basis of Example 1, select x=0.1, y=1 components to add zwt%C substances, and the rest are the same as Example 1. The test results are shown in Table 2.

[0035] Table 2 is the experimental result involved in embodiment 2:

[0036]

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Abstract

The invention relates to a microwave dielectric ceramic with extra-high quality factors, medium-low dielectric constants and near zero temperature coefficients, and a preparation method of the microwave dielectric ceramic. The chemical general formula of a magnesium ditantalum hexaoxide microwave dielectric ceramic is Mg<2.5+x>TaNbO<7.5+x>+y wt%B2O3+z wt% C, wherein x is greater than or equal to 0 and smaller than or equal to 0.2, the weight percentage content y wt% of B2O3 is that y is greater than or equal to 1 and smaller than or equal to 2 on the premise that the weight of the Mg<2.5+x>TaNbO<7.5+x> is 100%, the weight percentage content z wt% of C is that z is greater than or equal to 0 and smaller than or equal to 1 on the premise that the total weight of the Mg<2.5+x>TaNbO<7.5+x> and B2O3 is 100%, and C is at least one of ZnO, CuO, Al2O3, MnO2, WO3, ZrO2 and SnO2. The dielectric constants of the magnesium ditantalum hexaoxide microwave dielectric ceramic are adjusted through an Mg element and a Nb element, and the frequency temperature coefficient can also be correspondingly adjusted.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and in particular relates to a microwave dielectric ceramic with medium and low dielectric constant, ultra-low dielectric loss and nearly zero frequency temperature coefficient and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of 5G communication technology, the demand for microwave devices is also increasing, especially ceramics with low and medium dielectric constant, extremely low microwave loss and near zero frequency temperature coefficient. This kind of ceramic can not only meet the requirements of mobility, portability, miniaturization, and miniaturization of the communication machine, but also meet the requirements of high performance and high reliability working characteristics in the microwave range, and has attracted widespread attention. [0003] MgO-Ta 2 o 5 In the binary system, the stable phase MgTa ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3206C04B2235/3217C04B2235/3244C04B2235/3251C04B2235/3258C04B2235/3267C04B2235/3281C04B2235/3284C04B2235/3293C04B2235/3409
Inventor 党明召任海深谢天毅张良柱姜少虎姚晓刚赵相毓林慧兴
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI