Check patentability & draft patents in minutes with Patsnap Eureka AI!

Low-temperature-sintering microwave dielectric ceramic with high dielectric constant and preparation method of microwave dielectric ceramic

A microwave dielectric ceramic, high dielectric constant technology, applied in chemical instruments and methods, inorganic chemistry, titanium compounds, etc., can solve the problem of not being able to be adjusted to zero, and achieve low cost, high dielectric constant, and excellent microwave performance. Effect

Inactive Publication Date: 2013-12-25
NAT UNIV OF DEFENSE TECH
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding CaTiO 3 Compared with a class of ceramics with a negative resonant frequency temperature coefficient (Li 1 / 2 Nd 1 / 2 )TiO 3 Composite can be obtained (Li 1 / 2 Nd 1 / 2 )TiO 3 -CaTiO 3 Ceramic, so that the resonant frequency temperature coefficient is adjusted to a small value, but still cannot be adjusted to zero

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A low-temperature sintered high dielectric constant microwave dielectric ceramic of the present invention, the microwave dielectric ceramic consists of (1-x)(Li 1 / 2 Nd 1 / 2 )TiO 3 -xCaTiO 3 (x=0.2) and Bi 4 B 2 o 9 composition, where (1-x)(Li 1 / 2 Nd 1 / 2 )TiO 3 -xCaTiO 3 The mass fraction is 97.5%, Bi 4 B 2 o 9 The mass fraction of the microwave dielectric ceramic is 2.5%; the dielectric constant of the microwave dielectric ceramic is 124, and the quality factor Qf 0 It is 2400GHz, and the resonant frequency temperature coefficient is 25ppm / ℃.

[0023] A preparation method of the low-temperature sintered high-dielectric-constant microwave dielectric ceramic of the above-mentioned embodiment, comprising the following steps:

[0024] (1) First, Li with a purity greater than 99.9% 2 CO 3 、Nd 2 o 3 , CaO and TiO 2Mix according to the molar ratio of 1:1:1:5, place the resulting mixture in a ball mill jar, and add zirconia balls and isopropanol into the ball m...

Embodiment 2

[0029] A low-temperature sintered high dielectric constant microwave dielectric ceramic of the present invention, the microwave dielectric ceramic consists of (1-x)(Li 1 / 2 Nd 1 / 2 )TiO 3 -xCaTiO 3 (x=0.2) and Bi 4 B 2 o 9 composition, where (1-x)(Li 1 / 2 Nd 1 / 2 )TiO 3 -xCaTiO 3 The mass fraction is 96%, Bi 4 B 2 o 9 The mass fraction of the microwave dielectric ceramic is 4%; the dielectric constant of the microwave dielectric ceramic is 127, and the quality factor Qf 0 It is 2710GHz, and the resonant frequency temperature coefficient is -4.5ppm / ℃.

[0030] A preparation method of the low-temperature sintered high-dielectric-constant microwave dielectric ceramic of the above-mentioned embodiment, comprising the following steps:

[0031] (1) First, Li with a purity greater than 99.9% 2 CO 3 、Nd 2 o 3 , CaO and TiO 2 Mix according to the molar ratio of 1:1:1:5, place the resulting mixture in a ball mill jar, and add zirconia balls and isopropanol into the ball mi...

Embodiment 3

[0036] A low-temperature sintered high dielectric constant microwave dielectric ceramic of the present invention, the microwave dielectric ceramic consists of (1-x)(Li 1 / 2 Nd 1 / 2 )TiO 3 -xCaTiO 3 (x=0.2) and Bi 4 B 2 o 9 composition, where (1-x)(Li 1 / 2 Nd 1 / 2 )TiO 3 -xCaTiO 3 The mass fraction is 95%, Bi 4 B 2 o 9 The mass fraction of the microwave dielectric ceramic is 5%; the dielectric constant of the microwave dielectric ceramic is 129, and the quality factor Qf 0 It is 2890GHz, and the resonant frequency temperature coefficient is -30ppm / ℃.

[0037] A preparation method of the low-temperature sintered high-dielectric-constant microwave dielectric ceramic of the above-mentioned embodiment, comprising the following steps:

[0038] (1) First, Li with a purity greater than 99.9% 2 CO 3 、Nd 2 o 3 , CaO and TiO 2 Mix according to the molar ratio of 1:1:1:5, place the resulting mixture in a ball mill jar, and add zirconia balls and isopropanol into the ball mil...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Quality factoraaaaaaaaaa
Resonant frequency temperature coefficientaaaaaaaaaa
Quality factoraaaaaaaaaa
Login to View More

Abstract

The invention discloses low-temperature-sintering microwave dielectric ceramic with a high dielectric constant and a preparation method of the microwave dielectric ceramic. The microwave dielectric ceramic comprises 90-97.5% of (1-x)(Li1 / 2Nd1 / 2)TiO3-xCaTiO3 and 2.5-10% of Bi4B2O9, wherein x is greater than or equal to 0.2, and less than or equal to 0.8. The preparation method comprises the following steps: (1) mixing Li2CO3, Nd2O3, TiO2 and CaO or CaCO3 to prepare (1-x)(Li1 / 2Nd1 / 2)TiO3-xCaTiO3 powder, (2) mixing Bi2O3 and B2O3 or H3BO3 to prepare Bi4B2O9 powder, and (3) mixing the two powder to prepare the low-sintering microwave dielectric ceramic with the high dielectric constant. The microwave dielectric ceramic has the high dielectric constant and a temperature coefficient of resonance frequency approximate to zero. The preparation method is simple in technology and low in cost.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, and in particular relates to a low-temperature sintered high dielectric constant microwave dielectric ceramic and a preparation method thereof. Background technique [0002] The application of microwave dielectric ceramic materials is related to its dielectric constant, usually, ε r Low dielectric constant ceramics <20 are mostly used in dielectric substrates, antennas and high-end or high-frequency microwave components, 20≤ε r Ceramics with a dielectric constant of ≤70 are mainly used in satellite communication systems and mobile communication base stations, ε r High dielectric constant ceramics >70 are mostly used in microwave dielectric resonators in mobile phones, military radar and GPS systems, etc. [0003] The higher the dielectric constant of microwave dielectric ceramic materials, the smaller the size of microwave circuits and devices can be made, which is t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/462C04B35/468C04B35/622C01G23/00
Inventor 张为军白书欣堵永国刘卓峰陈兴宇
Owner NAT UNIV OF DEFENSE TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com