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High-performance microwave dielectric ceramic material and preparation method thereof

A high-performance technology of microwave dielectric ceramics, applied in the field of ceramic materials, can solve the problems of unstable price of rare earth raw materials, small dielectric constant, high price, etc.

Inactive Publication Date: 2015-01-07
武汉凡谷陶瓷材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The development of the modern communication industry has higher and higher requirements for the quality factor of the dielectric material. The commercialized Q f The microwave dielectric materials with higher values ​​mainly include Ba(Mg 1 / 3 Ta 2 / 3 )O 3 (BMT), Ba(Zn 1 / 3 Ta 2 / 3 )O 3 (BZT), LnAlO 3 -CaTiO 3 system, Zr-Ti-Sn-O system and ZrTiO 4 -ZnNb 2 o 6 etc., the Q of BMT and BZT in these materials f Although higher, the raw material Ta used 2 o 5 Expensive, high sintering temperature; LnAlO 3 -CaTiO 3 Although the sintering temperature of the series is low, the Q f The value cannot fully meet the development needs of the industry, and the price of some rare earth raw materials is unstable; Zr-Ti-Sn-O series and ZrTiO 4 -ZnNb 2 o 6 Department of Q f Although high, the dielectric constant is small

Method used

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  • High-performance microwave dielectric ceramic material and preparation method thereof
  • High-performance microwave dielectric ceramic material and preparation method thereof
  • High-performance microwave dielectric ceramic material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0034] (1) Accurately weigh BaCO with a purity greater than 99.95% 3 0.11mol, CaCO 3 0.008mol, La 2 o 3 0.19mol, Sm 2 o 3 0.012mol and TiO 2 0.42mol, pour it into a resin ball mill tank, add deionized water and zirconium balls; the weight ratio of the three is: material: balls: deionized water = 1:2:1.5; ball mill in a ball mill for 24 hours to ensure uniform mixing ;After discharging, put the slurry into the oven, and dry it at 120°C to obtain the dried powder;

[0035] (2) Pass the dried powder through a 40-mesh sieve, then calcinate at 1200°C for 3 hours, and cool with the furnace to obtain a ceramic powder;

[0036] (3) Dissolve 1wt / % chemically pure zinc alkoxide (Zn) and 1.5wt / % chemically pure magnesium alkoxide (Mg) in absolute ethanol, add appropriate amount of diethanolamine and mix well, then add deionized water , through hydrolysis, polycondensation reaction, and then forming a gel to prepare nano-scale liquid phase Zn additives and Mg additives with a p...

Embodiment 2

[0040] BaCO 3 0.108mol, SrCO 3 0.008mol, La 2 o 3 0.192mol, Sm 2 o 3 0.0102mol, Pm 2 o 3 0.008mol, TiO 2 0.418 mol, 2 wt / % zinc alkoxide (Zn) and 1 wt / % nickel alkoxide (Ni). The preparation method is the same as that of Example 1, and a microwave dielectric ceramic material 2 is obtained.

Embodiment 3

[0042] BaCO 3 0.118mol, La 2 o 3 0.194mol, Eu 2 o 3 0.0122mol, TiO 2 0.420 mol, 2.5 wt / % zinc alkoxide (Zn) and 1 wt / % tin alkoxide (Sn). The preparation method is the same as that of Example 1, and a microwave dielectric ceramic material 3 is obtained.

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Abstract

The invention provides a high-performance microwave dielectric ceramic material which is prepared from xMO-yLn2O3-zTiO2 and a metal nanoscale additive, wherein M comprises Ba and further comprises one or two of Ca or Sr; Ln comprises La and further comprises one or more of Sm, Pm, Nd, Pr or Eu; the metal nanoscale additive comprises Zn and further comprises one or more of Zr, Sn, Mg, Ni, Co or W; and x+y+z is equal to 1. The invention further provides a preparation method of the ceramic material. According to the microwave dielectric ceramic material provided by the invention, the dielectric constant is 46-48, and meanwhile has a relatively high quality factor of 35000-50000GHz, and the temperature coefficient of resonance frequency can be adjusted within a range from -12ppm / DEG C to +12ppm / DEG C.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a high-performance microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave resonators and filters used in 3G and 4G base stations must have good frequency selection characteristics, bandwidth, miniaturization and low cost. Although the cost of the existing metal cavity resonator is low, its unloaded Q value is very low (~6000 GHz), and the temperature stability of the resonant frequency is poor. [0003] Dielectric resonators usually have the characteristics of high no-load quality factor, small and adjustable frequency temperature coefficient, and small volume, so they are more and more widely used. The corresponding microwave dielectric ceramic materials must have (1) high dielectric constant (30-60), (2) high quality factor (Q f ≥40000GHz), (3) near-zero adjustable resonant frequency temperature coefficient. [0004] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 李儒钟伟刚
Owner 武汉凡谷陶瓷材料有限公司
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