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Compound BZT microwave ceramic dielectric material and preparation method thereof

A technology of dielectric materials and microwave ceramics, which is applied in the field of composite BZT microwave ceramic dielectric materials and its preparation, can solve the problems of high sintering temperature, unfavorable wide application, and hindrance of large-scale practical application, and achieve the effect of easy stable production and low price

Inactive Publication Date: 2013-05-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For BaO-TiO 2 BaTi in the system 4 o 9 The sintering temperature of ceramics is usually greater than 1300°C, the dielectric constant is 37, and the Q×f value is 22700GHz, but its high frequency temperature coefficient τf=+15ppm / °C hinders its large-scale practical application
High sintering temperature is not conducive to wide application

Method used

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  • Compound BZT microwave ceramic dielectric material and preparation method thereof
  • Compound BZT microwave ceramic dielectric material and preparation method thereof
  • Compound BZT microwave ceramic dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0035] The concrete implementation steps that make these embodiment microwave dielectric ceramics are as follows:

[0036] (1) Select BaCO3, ZnO and TiO2 with a purity greater than 99% as raw materials, according to BaCO 3 :ZnO:TiO 2 =1: (0.1~1.5): the mol ratio of 4 carries out raw material preparation, and concrete formula sees Table 1 for details;

[0037] (2) Put the prepared material into the nylon ball mill tank, and use zirconium balls as the balls and deionized water as the ball mill medium, and perform a ball mill for 20 hours according to the weight ratio of material: ball: water=1:5:1.4; After the primary ball milling, take out the primary ball grinding material, dry it at 100°C and pass through a 40-mesh sieve;

[0038] (3) Put the primary ball abrasive that was dried at 100°C and passed through a 40-mesh sieve into the crucible, and pre-fired at 1000°C for 3 hours;

[0039] (4) Carry out the secondary ball milling for 10 hours according to the weight ratio of m...

Embodiment 10～17

[0046] The concrete implementation steps that make these embodiment microwave dielectric ceramics are as follows:

[0047] (1) Select BaCO3, ZnO and TiO2 with a purity greater than 99% as raw materials, according to BaCO 3 :ZnO:TiO 2 =1: The mol ratio of 0.5: 4 carries out material preparation, promptly selects embodiment 3 as base material;

[0048] (2) Carry out a ball mill for 20 hours according to the weight ratio of material: ball: water=1:5:1.4; after the first ball mill, take out the ball mill material and dry it at 100°C and pass through a 40-mesh sieve;

[0049] (3) Put the primary ball abrasive that was dried at 100°C and passed through a 40-mesh sieve into the crucible, and pre-fired at 1100°C for 5 hours;

[0050] (4) After adding 0.0 to 2.0% MnO2, 0.0 to 1.5% Nd2O3 and 0.0 to 3.0% CuO to the pre-sintered material, according to the weight of material: ball: water = 1: 5: 1.4 Perform secondary ball milling for 24 hours; after the secondary ball milling, take out ...

Embodiment 18～22

[0057] The concrete implementation steps that make these embodiment microwave dielectric ceramics are as follows:

[0058] (1) Select BaCO3, ZnO and TiO2 with a purity greater than 99% as raw materials, according to BaCO 3 :ZnO:TiO 2 =1: 11: 4 molar ratio prepares materials, promptly selects embodiment 7 as base material;

[0059] (2) Carry out a ball mill for 20 hours according to the weight ratio of material: ball: water=1:5:1.4; after the first ball mill, take out the ball mill material and dry it at 100°C and pass through a 40-mesh sieve;

[0060] (3) Put the primary ball abrasive that was dried at 100°C and passed through a 40-mesh sieve into the crucible, and pre-fired at 1100°C for 5 hours;

[0061](4) After adding 0.0 to 2.0% MnO2, 0.0 to 1.5% Nd2O3 and 0.0 to 3.0% CuO to the pre-sintered material, according to the weight of material: ball: water = 1: 5: 1.4 Perform secondary ball milling for 24 hours; after the secondary ball milling, take out the secondary ball gr...

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Abstract

The invention relates to a compound BZT microwave ceramic dielectric material and a preparation method thereof and belongs to the field of an electronic information functional material and a device. The material has a structure of two crystal phases with a mole ratio of BaTi4O9 to BaZn2Ti4O11 equal to (1-x): x (x belonging to [0.05, 0.75]), and meanwhile, 0.0 to 2.0 percent of MnO2, 0.0 to 1.5 percent of Nd2O3 and 0.0 to 3.0 percent of CuO are added. In the invention, the BaTi4O9 ceramics and the BaZn2Ti4O11 ceramics which respectively have positive and negative frequency temperature coefficients are compounded, and the MnO2, the Nd2O3 and the CuO are added, thereby obtaining the compound BZT microwave ceramic dielectric material with moderate dielectric constant, higher quality factor and continuously adjustable frequency temperature coefficient approaching to zero. The compound BZT microwave ceramic dielectric material can be roasted at middle temperature and is suitable for manufacturing microwave communication elements, such as, a resonator, a filter, a base plate, an antenna, and the like. During a preparation process, a traditional solid phase method is adopted for once compounding a BaTi4O9+ BaZn2Ti4O11 complex phase structure. The preparation method is characterized by optimized process, capability of saving energy and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of electronic information functional materials and devices, and specifically relates to a composite BZT microwave ceramic dielectric material with moderate dielectric constant, high quality factor and close to zero frequency temperature coefficient and a preparation method thereof, which is suitable for making modern communication technology Microwave communication components such as dielectric resonators, dielectric filters, dielectric substrates, and dielectric antennas. Background technique [0002] In the past 20 years, the application of microwave ceramic dielectrics in microwave communication components such as dielectric resonators, dielectric filters, and dielectric antennas has made the miniaturization and cost reduction of wireless communication equipment a reality. Today, microwave dielectric ceramics are widely used in the field of microwave and mobile communications. The development of new micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 唐斌余盛全周晓华钟朝位张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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