A medium-low temperature sinterable high-dielectric microwave dielectric ceramic and its preparation method

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

Inactive Publication Date: 2014-10-22
GUILIN UNIV OF ELECTRONIC TECH
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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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  • A medium-low temperature sinterable high-dielectric microwave dielectric ceramic and its preparation method
  • A medium-low temperature sinterable high-dielectric microwave dielectric ceramic and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] with 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 Carry out proportioning, carry out wet ball milling with absolute ethanol as a medium, and synthesize (Ca after drying at 1100 ° C for 4 hours) 0.8 Sr 0.2 ) 0.2 (Li 0.5 Sm 0.5 ) 0.8 TiO 3 powder; at the same time with Bi 2 O 3 , B 2 O 3 Press Bi as raw material 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] put synthetic (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 mass percentage of 100:20, 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 blank on a...

Embodiment 2

[0021] with 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 Carry out proportioning, carry out wet ball milling with absolute ethanol as a medium, and synthesize (Ca after drying at 1100 ° C for 4 hours) 0.8 Sr 0.2 ) 0.3 (Li 0.5 Sm 0.5 ) 0.7 TiO 3 powder; at the same time with Bi 2 O 3 , B 2 O 3 Press Bi as raw material 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] put synthetic (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 body on a ...

Embodiment 3

[0025] with 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 Carry out proportioning, carry out wet ball milling with absolute ethanol as a medium, and synthesize (Ca after drying at 1100 ° C for 4 hours) 0.8 Sr 0.2 ) 0.4 (Li 0.5 Sm 0.5 ) 0.6 TiO 3 powder; at the same time with Bi 2 O 3 , B 2 O 3 Press Bi as raw material 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] put synthetic (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 cylindrical blank o...

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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 sintered high-dielectric microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are a kind of widely used information functional materials. They can be used in microwave circuits to transmit, reflect, and absorb electromagnetic waves to achieve microwave modulation. They have low loss, low temperature coefficient of resonant frequency, and dielectric constant. It can be made into dielectric stable frequency oscillator, dielectric resonator, dielectric waveguide transmission line, dielectric filter, duplexer, microwave dielectric antenna, etc. Especially in the field of satellite communication, it is very important to obtain high temperature stability and high dielectric microwave dielectric ceramic devices. However, the sintering temperature of most high-dielectric microwave dielectric...

Claims

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Application Information

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Patent Type & Authority Patents(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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