Middle-dielectric-constant microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency

A technology of microwave dielectric ceramics and temperature coefficient, applied in the field of ceramic compositions, can solve problems such as limited application value of ceramics

Inactive Publication Date: 2017-06-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the large resonant frequency temperature coefficient makes pure ZnTiTa 2 o 8 Ceramic application value is limited, therefore, to improve Z...

Method used

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  • Middle-dielectric-constant microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency
  • Middle-dielectric-constant microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency
  • Middle-dielectric-constant microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency

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Experimental program
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Effect test

Embodiment 1

[0029] Raw materials ZnO, MgO, TiO with analytical purity 2 , ZrO 2 、 Ta 2 o 5 According to the formula (Zn 0.97 Mg 0.03 )(Ti 0.38 Zr 0.62 ) Ta 2 o 8 After the molar ratio is configured, fully mix and ball mill for 6 hours, then dry at 100°C, pass through a 40-mesh sieve, pre-fire at 1050°C in an air atmosphere, and keep warm for 3 hours to synthesize a frit; then pass the frit through a 40-mesh sieve After the mesh sieve is crushed, add polyvinyl alcohol powder with a mass fraction of 0.75%, ball mill for another 12 hours, dry at 100°C and pass through 40-mesh and 80-mesh sieves respectively to obtain the required microwave dielectric ceramic raw material; The raw materials are pressed and formed into a cylindrical body of Φ10mm×5mm as required, and then sintered into porcelain at 1270°C in air and kept for 4 hours to obtain a microwave dielectric ceramic with a medium dielectric constant.

[0030] Finally, the microwave dielectric properties of the product were meas...

Embodiment 2

[0032] Raw materials ZnO, MgO, TiO with analytical purity 2 , ZrO 2 、 Ta 2 o 5 According to the formula (Zn 0.96 Mg 0.04 )(Ti 0.38 Zr0.62 ) Ta 2 o 8 After the molar ratio is configured, fully mix and ball mill for 6 hours, then dry at 100°C, pass through a 40-mesh sieve, pre-fire at 1050°C in an air atmosphere, and keep warm for 3 hours to synthesize a frit; then pass the frit through a 40-mesh sieve After the mesh sieve is crushed, add polyvinyl alcohol powder with a mass fraction of 0.75%, ball mill for another 12 hours, dry at 100°C and pass through 40-mesh and 80-mesh sieves respectively to obtain the required microwave dielectric ceramic raw material; The raw materials are pressed and formed into a cylindrical green body of Φ10mm×5mm as required, and then sintered in the air at 1270°C and kept warm for 4 hours to form a porcelain, that is, a microwave dielectric ceramic with a medium dielectric constant.

[0033] Finally, the microwave dielectric properties of the...

Embodiment 3

[0035] Raw materials ZnO, MgO, TiO with analytical purity 2 , ZrO 2 、 Ta 2 o 5 According to the formula (Zn 0.95 Mg 0.05 )(Ti 0.38 Zr 0.62 ) Ta 2 o 8 After the molar ratio is configured, fully mix and ball mill for 6 hours, then dry at 100°C, pass through a 40-mesh sieve, pre-fire at 1050°C in an air atmosphere, and keep warm for 3 hours to synthesize a frit; then pass the frit through a 40-mesh sieve After the mesh sieve is crushed, add polyvinyl alcohol powder with a mass fraction of 0.75%, ball mill for another 12 hours, dry at 100°C and pass through 40-mesh and 80-mesh sieves respectively to obtain the required microwave dielectric ceramic raw material The raw materials are pressed and formed into a cylindrical green body of Φ10mm×5mm as required, and then sintered in air at 1270°C, and kept warm for 4 hours to form porcelain, that is, microwave dielectric ceramics with medium dielectric constant.

[0036] Finally, the microwave dielectric properties of the produc...

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Abstract

The invention discloses middle-dielectric-constant microwave dielectric ceramic with an adjustable temperature coefficient of resonance frequency. The expression is (Zn1-xMgx)(Ti1-yZry)Ta2O8, wherein x is larger than or equal to 0.03 and smaller than or equal to 0.05, and y is larger than or equal to 0.62 and smaller than or equal to 0.68. Firstly, ZnO, MgO, TiO2, ZrO2 and Ta2O5 are taken as raw materials and blended in a mole ratio; the mixture is subjected to ball milling, dried, sieved and presintered at the temperature of 1,050-1,100 DEG C, and clinker is synthesized; polyvinyl alcohol with the mass percent being 0.75%-1.25% is added to the clinker, and secondary ball milling is performed; blanks are formed after drying, sieving and pressure forming and then sintered at the temperature of 1,270-1,300 DEG C, and the required microwave dielectric ceramic is prepared. The performance of the product is improved after composite doping and modification, the dielectric constant epsilon r ranges from 35.7 to 38.4, the value of the quality factor Q*f ranges from 46,200 GHz to 51,900 GHz, the temperature coefficient tau f of resonance frequency is adjustable around zero, and the preparation process is simple, meets requirements of environment protection and facilitates large-scale industrial production.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a tantalate microwave dielectric ceramic with medium dielectric constant and adjustable temperature coefficient of resonant frequency and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are mainly used to make microwave components such as resonators, filters, and dielectric waveguide circuits for modern communications, which can meet the requirements of miniaturization, integration, and high reliability of microwave circuits. With the rapid development of mobile communication and electronic technology, the demand for microwave materials and their components is increasing, and the performance requirements are also getting higher and higher. The research focus and evaluation criteria of microwave dielectric ceramics mainly include the following three aspects: serialization of dielectric constant to meet different applicat...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/626C04B35/634
CPCC04B35/495C04B35/62675C04B35/63416C04B2235/3206C04B2235/3232C04B2235/3244C04B2235/3284C04B2235/602C04B2235/656C04B2235/6567C04B2235/94
Inventor 李玲霞吕笑松杜明昆
Owner TIANJIN UNIV
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