High-permittivity microwave dielectric ceramics capable of being sintered at medium-low temperature and preparation method thereof

A technology of microwave dielectric ceramics and low-temperature sintering, which is applied in the field of information functional materials, can solve problems such as quality factor decline, and achieve the effects of simple preparation process, high practicability and promotion prospects

Inactive Publication Date: 2013-09-04
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing high-dielectric microwave dielectric ceramics are ε after low-temperature sintering. r and quality factor Q f It means that achieving low-temperature sintering and maintaining good microwave dielectric properties is the main problem in the field of microwave dielectric materials, and solving this problem is a research hotspot in the field of microwave dielectric materials

Method used

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  • High-permittivity microwave dielectric ceramics capable of being sintered at medium-low temperature and preparation method thereof
  • High-permittivity microwave dielectric ceramics capable of being sintered at medium-low temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] CaCO 3 , SrCO 3 , Li 2 CO 3 、Sm 2 o 3 and TiO 2 As raw material, according to the chemical formula (Ca 0.8 Sr 0.2 ) 0.2 (Li 0.5 SM 0.5 ) 0.8 TiO 3 Proportioning, wet ball milling with anhydrous ethanol as the medium, and after drying, it was synthesized by heat preservation at 1100°C for 4 hours (Ca 0.8 Sr 0.2 ) 0.2 (Li 0.5 SM 0.5 ) 0.8 TiO 3 powder; at the same time Bi 2 o 3 , B 2 o 3 For raw materials according to Bi 2 o 3 :B 2 o 3 = 2:1 molar ratio mixing ball milling, drying, and then the resulting Bi 2 o 3 , B 2 o 3 The mixture was incubated at 550°C for 8 hours to synthesize Bi 4 B 2 o 9 Burning aid.

[0018] Synthesize (Ca 0.8 Sr 0.2 ) 0.2 (Li 0.5 SM 0.5 ) 0.8 TiO 3 Powder and Bi 4 B 2 o 9 The sintering aid is mixed and ball-milled at a ratio of 100:20 by mass, and a certain amount of polyvinyl alcohol (PVA) with a mass concentration of 5% is added, mixed evenly, dried, and then pressed into a circular columnar green bo...

Embodiment 2

[0021] CaCO 3 , SrCO 3 , Li 2 CO 3 、Sm 2 o 3 and TiO 2 As raw material, according to the chemical formula (Ca 0.8 Sr 0.2 ) 0.3 (Li 0.5 SM 0.5 ) 0.7 TiO 3 Proportioning, wet ball milling with anhydrous ethanol as the medium, and after drying, it was synthesized by heat preservation at 1100°C for 4 hours (Ca 0.8 Sr 0.2 ) 0.3 (Li 0.5 SM 0.5 ) 0.7 TiO 3 powder; at the same time Bi 2 o 3 , B 2 o 3 For raw materials according to Bi 2 o 3 :B 2 o 3 = 2:1 molar ratio mixing ball milling, drying, and then the resulting Bi 2 o 3 , B 2 o 3 The mixture was incubated at 550°C for 8 hours to synthesize Bi 4 B 2 o 9 Burning aid.

[0022] Synthesize (Ca 0.8 Sr 0.2 ) 0.3 (Li 0.5 SM 0.5 ) 0.7 TiO 3 Powder and Bi 4 B 2 o 9 The sintering aid is mixed and ball-milled at a mass percentage of 100:25, and a certain amount of polyvinyl alcohol (PVA) with a mass concentration of 5% is added, mixed evenly, dried, and then pressed into a circular columnar green ...

Embodiment 3

[0025] CaCO 3 , SrCO 3 , Li 2 CO 3 、Sm 2 o 3 and TiO 2 As raw material, according to the chemical formula (Ca 0.8 Sr 0.2 ) 0.4 (Li 0.5 SM 0.5 ) 0.6 TiO 3 Proportioning, wet ball milling with anhydrous ethanol as the medium, and after drying, it was synthesized by heat preservation at 1100°C for 4 hours (Ca 0.8 Sr 0.2 ) 0.4 (Li 0.5 SM 0.5 ) 0.6 TiO 3 powder; at the same time Bi 2 o 3 , B 2 o 3 For raw materials according to Bi 2 o 3 :B 2 o 3 = 2:1 molar ratio mixing ball milling, drying, and then the resulting Bi 2 o 3 , B 2 o 3 The mixture was incubated at 550°C for 8 hours to synthesize Bi 4 B 2 o 9 Burning aid.

[0026] Synthesize (Ca 0.8 Sr 0.2 ) 0.4 (Li 0.5 SM 0.5 ) 0.6 TiO 3 Powder and Bi 4 B 2 o 9 The sintering aid is mixed and ball-milled at a mass percentage of 100:30, and a certain amount of polyvinyl alcohol (PVA) with a mass concentration of 5% is added, mixed evenly, dried, and then pressed into a circular columnar green ...

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Abstract

The invention discloses high-permittivity microwave dielectric ceramics capable of being sintered at medium-low temperature and a preparation method thereof. The ceramic material is a composite ceramic material whose main component is composited by (Ca0.8Sr0.2)x(Li0.5Sm0.5)(1-x)TiO3 and any of bi-based compounds Bi4B2O9, Bi2W2O9 and Bi2MoO6 sintering agents. The implementation method comprises the steps that (Ca0.8Sr0.2)x(Li0.5Sm0.5)(1-x)TiO3 powder as well as Bi4B2O9, Bi2W2O9 and Bi2MoO6 sintering agents are synthesized firstly; the (Ca0.8Sr0.2)x(Li0.5Sm0.5)(1-x)TiO3 powder is mixed and ball-milled with any of the Bi4B2O9, Bi2W2O9 and Bi2MoO6 sintering agents; and then the mixed powder containing the sintering agent is compressed into a cylindrical blank body and is subjected to heat preservation for 4 hours at 900 DEG C-1050 DEG C for presintering, so that the high-permittivity (Ca0.8Sr0.2)x(Li0.5Sm0.5)(1-x)TiO3 microwave dielectric ceramics which can be sintered at medium-low temperature and contain the sintering agent. The ceramic material has higher permittivity, smaller resonance temperature coefficient and moderate loss; performance tests prove that better microwave dielectric performances can be obtained: the permittivity Epsilonr is larger than 95, the absolute value of the resonance temperature coefficient Tauf is smaller than 50 ppm/DEG C, the quality factor Qf is larger than 1,500 GHz, the best sintering temperature is lower than 1,050 DEG C, and the 900-DEG C optimum sintering can be achieved; and the whole preparation technology for the microwave dielectric ceramics is relatively simple, stable and easy to implement.

Description

technical field [0001] The invention relates to information functional materials, in particular to a medium-low temperature sinterable high-dielectric microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are a kind of information functional materials that are widely used. They can be used in microwave circuits to realize the transmission, reflection and absorption of electromagnetic waves to achieve the effect of microwave modulation. They have low loss, small temperature coefficient of resonance frequency, and low dielectric constant. Large and other characteristics, can be made into dielectric frequency stabilized oscillators, dielectric resonators, dielectric waveguide transmission lines, dielectric filters, duplexers, microwave dielectric antennas, etc. Especially in the field of satellite communication, it is very important to obtain microwave dielectric ceramic devices with high temperature stability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/50C04B35/622
Inventor 袁昌来陈国华杨云周秀娟周昌荣
Owner GUILIN UNIV OF ELECTRONIC TECH
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