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A kind of multiphase microwave dielectric ceramic and preparation method thereof by cold sintering

A microwave dielectric ceramic and microwave dielectric technology are applied in the field of electronic ceramic materials, which can solve the problems of difficult-to-cold sintering technology preparation and the like, and achieve the effects of low dielectric constant and wide application prospects.

Active Publication Date: 2022-06-24
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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  • A kind of multiphase microwave dielectric ceramic and preparation method thereof by cold sintering
  • A kind of multiphase microwave dielectric ceramic and preparation method thereof by cold sintering
  • A kind of multiphase microwave dielectric ceramic and preparation method thereof by cold sintering

Examples

Experimental program
Comparison scheme
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 Weighing CBMVO-LMO and PTFE, using anhydrous ethanol as a medium, ball milled by a planetary ball mill for 10–12 h, and then dried at 80 °C. Weigh an appropriate amount of mixed powder into an agate mortar, add 7wt.% deionized water, grind for 5min, pass the ground powder through an 80-mesh sieve, put it into a hot-pressing mold (diameter 11mm) at a temperature of 150°C and 300MPa The target composite material was obtained by molding under the pressure of 100 °C, keeping the temperature for 1 h, and then drying it at 120 °C for 12 h.

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 -1 wt.% PTFE Weighing CBMVO-LMO and PTFE, others are the same as in Example 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 Weighing CBMVO-LMO and PTFE, the others are the same as in Example 1.

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Abstract

A composite microwave dielectric ceramic and a cold sintering preparation method thereof belong to the technical field of electronic ceramics. Water-soluble Li 2 MoO 4 As a sintering aid, organic PTFE is introduced as a positive temperature coefficient modifier (Ca 0.65 Bi 0.35 )(Mo 0.65 V 0.35 )O 4 system, a composite microwave dielectric ceramic was prepared by cold sintering at 150°C and 300MPa. The complex-phase microwave dielectric ceramic has low dielectric constant and nearly zero temperature coefficient of resonance frequency, and has wide application prospects 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, in particular to a complex-phase microwave dielectric ceramic with low dielectric constant and near-zero resonant frequency temperature coefficient and a cold sintering preparation method thereof. Background technique [0002] 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. Temperature coefficient of resonance frequency (τ f ) is a key parameter for evaluating the temperature stability of microwave dielectric ceramics, τ f The closer the value is to zero, the better its temperature stability. At present, the sintering process of microwave dielectric ceramics is mainl...

Claims

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Application Information

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Patent Type & Authority Patents(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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