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Complex-phase microwave dielectric ceramic and cold sintering preparation method thereof

A microwave dielectric ceramic and microwave dielectric technology, which is applied in the field of electronic ceramic materials, can solve the problems of difficult cold sintering technology preparation, etc., and achieve the effect of low dielectric constant and wide application prospects

Active Publication Date: 2021-12-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (Ca 0.65 Bi 0.35 )(Mo 0.65 V 0.35 )O 4 (CBMVO) is a class of microwave dielectric ceramics with high performance, but it is difficult to prepare by cold sintering technology because its powder is insoluble in water

Method used

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  • Complex-phase microwave dielectric ceramic and cold sintering preparation method thereof
  • Complex-phase microwave dielectric ceramic and cold sintering preparation method thereof
  • Complex-phase microwave dielectric ceramic and cold sintering preparation method thereof

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Effect test

Embodiment 1

[0018] (1) According to the chemical formula (Ca 0.65 Bi 0.35 )(Mo 0.65 V 0.35 )O 4 -5wt.%Li 2 MoO 4 -0.5wt.% PTFE Weigh the CBMVO-LMO and PTFE, use absolute ethanol as the medium, pass through a planetary ball mill for 10-12 hours, and then dry at 80°C. Weigh an appropriate amount of mixed powder and put it into an agate mortar, add 7wt.% deionized water, grind for 5 minutes, pass the ground powder through an 80-mesh sieve, and put it into a hot pressing mold (diameter 11mm) at a temperature of 150°C and 300MPa Molded under the pressure, heat preservation for 1h, and then dried at 120°C for 12h to obtain the target composite material.

Embodiment 2

[0020] According to the chemical formula (Ca 0.65 Bi 0.35 )(Mo 0.65 V 0.35 )O 4 -5wt.%Li 2 MoO 4 -1wt.% PTFE Weigh CBMVO-LMO and PTFE, other same as embodiment 1.

Embodiment 3

[0022] According to the chemical formula (Ca 0.65 Bi 0.35 )(Mo 0.65 V 0.35 )O 4 -5wt.%Li 2 MoO 4 -2wt.% PTFE Weigh CBMVO-LMO and PTFE, other same as embodiment 1.

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Abstract

The invention discloses multiphase microwave dielectric ceramic and a cold sintering preparation method thereof, belonging to the technical field of electronic ceramic. The preparation method comprises the following steps: introducing Li<2>MoO<4> which is easily dissolved in water and serves as a sintering aid and the organic matter PTFE which serves as a positive temperature coefficient regulator into a (Ca<0.65>Bi<0.35>)(Mo<0.65>V<0.35>)O4 system, and then preparing the complex-phase microwave dielectric ceramic at 150 DEG C and 300 MPa by using a cold sintering method. The complex-phase microwave dielectric ceramic has a low dielectric constant and a near-zero temperature coefficient of resonance frequency, and has a wide application prospect in microwave electronic components such as microwave dielectric substrates and resonators.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic materials, and in particular relates to a complex-phase microwave dielectric ceramic with low dielectric constant and near-zero resonance frequency temperature coefficient and a cold sintering preparation method thereof. Background technique [0002] Today, with the rapid development of modern wireless communication systems, microwave dielectric ceramics used to manufacture electronic components such as antennas, resonators, capacitors and filters have received extensive attention. Since electronic components have to work in different environments, higher requirements are placed on their temperature stability. Resonant frequency temperature coefficient (τ f ) is a key parameter to evaluate the temperature stability of microwave dielectric ceramics, τ f The closer the value is to zero, the better the temperature stability. At present, the sintering process of microwave dielectric cera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/634C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B35/63436C04B2235/3208C04B2235/3298C04B2235/3239C04B2235/3256C04B2235/3203
Inventor 郑木鹏李永强侯育冬朱满康
Owner BEIJING UNIV OF TECH
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