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High-dielectric-constant low-loss microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and high dielectric constant, which is applied in the field of microwave dielectric ceramics to achieve stable performance, facilitate large-scale industrial production, and reduce energy consumption

Inactive Publication Date: 2018-07-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a microwave dielectric ceramic with high dielectric constant and low loss and its preparation method, thus solving the problem in the prior art that it is difficult to improve the Qf while ensuring the high dielectric constant value and the technical problem of zeroing the resonant frequency temperature coefficient

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  • High-dielectric-constant low-loss microwave dielectric ceramic and preparation method thereof

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specific Embodiment

[0025] The present invention uses analytically pure BaCO 3 、Pr 6 o 11 、Sm 2 o 3 、TiO 2 , to prepare Ba 6-3x (Pr y SM 1-y ) 8+2x Ti 18 o 54(1 / 2≤x≤2 / 3, 0≤y≤0.25). Specific examples are as follows:

Embodiment 1

[0035] 1. Add analytically pure BaCO 3 、Pr 6 o 11 、Sm 2 o 3 、TiO 2 According to composition Ba 4 (Pr 0.05 SM 0.95 ) 9.33 Ti 18 o 54 mix evenly;

[0036] 2. Put the mixed raw materials into a ball mill tank and add deionized water for ball milling. The ball milling time is 4 hours; then the ball milled raw materials are dried at 120°C and passed through a 60-mesh sieve to obtain the first batch of uniform particles. Mixture;

[0037] 3. Raise the temperature of the first mixture to 1100° C. at 5° C. / min for 3.5 hours of pre-calcination to obtain a pre-fired powder.

[0038] 4. Put the pre-fired powder into a ball mill tank and add deionized water for ball milling. The ball milling time is 4 hours; then the ball-milled raw materials are dried at 120°C to obtain pre-fired ceramic powder;

[0039] 5. Using a mass fraction of 12% polyvinyl alcohol solution as a binder, the amount of binder added is 6% of the mass of the pre-fired ceramic powder, granulated and passed t...

Embodiment 2

[0043] 1. Add analytically pure BaCO 3 、Pr 6 o 11 、Sm 2 o 3 、TiO 2 According to composition Ba 4 (Pr 0.1 SM 0.9 ) 9.33 Ti 18 o 54 mix evenly;

[0044] 2. Put the mixed raw materials into a ball mill tank and add deionized water for ball milling. The ball milling time is 4 hours; then the ball milled raw materials are dried at 120°C and passed through a 60-mesh sieve to obtain the first batch of uniform particles. Mixture;

[0045] 3. Raise the temperature of the first mixture to 1200° C. at 5° C. / min for 2.5 hours of pre-calcination to obtain a pre-fired powder.

[0046] 4. Put the pre-fired powder into a ball mill tank and add deionized water for ball milling. The ball milling time is 4 hours; then the ball-milled raw materials are dried at 120°C to obtain pre-fired ceramic powder;

[0047] 5. Using a mass fraction of 12% polyvinyl alcohol solution as a binder, the amount of binder added is 6% of the mass of the pre-fired ceramic powder, granulated and passed thr...

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Abstract

The invention discloses a high-dielectric-constant low-loss microwave dielectric ceramic and a preparation method thereof, wherein the high-dielectric-constant low-loss microwave dielectric ceramic includes a main crystal phase, and the main crystal phase has the chemical expression of Ba[6-3x](Pr[y]Sm[1-y])[8+2x]Ti[18]O[54], wherein 1 / 2<=x<=2 / 3, and 0<=y<=0.25. A small amount of Pr is used for replacing Sm creatively, and the high-dielectric-constant low-loss microwave dielectric ceramic Ba[6-3x](Pr[y]Sm[1-y])[8+2x]Ti[18]O[54] is obtained, wherein 1 / 2<=x<=2 / 3, and 0<=y<=0.25. The high-dielectric-constant low-loss microwave dielectric ceramic has the near zero temperature coefficient of -11.5 ppm / DEG C to +5.1 ppm / DEG C, the high dielectric constant of 78.1-83.8 and the high quality factor of 7100 GHz-9700 GHz.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and more specifically relates to a microwave dielectric ceramic with high dielectric constant and low loss and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are a new class of electronic ceramic materials developed in recent decades, and are the key to microwave components such as resonators, filters, duplexers, microwave capacitors, chip antennas, frequency-stabilized oscillators, and waveguide transmission lines. materials, among which dielectric resonators and filters are the most widely used microwave dielectric ceramic components. Microwave components made of microwave dielectric ceramics have the advantages of small size, high quality factor, and good temperature stability, and have been widely used in the field of mobile communications. [0003] In recent years, with the large-scale commercialization of 4G around the world,...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/46C04B35/622
CPCC04B35/46C04B35/50C04B35/622C04B2235/3215C04B2235/3224C04B2235/3232C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567C04B2235/76
Inventor 傅邱云王耿周东祥郑志平罗为
Owner HUAZHONG UNIV OF SCI & TECH