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Microwave dielectric ceramic with medium dielectric constant and low loss

A microwave dielectric ceramic and electric constant technology, applied in the field of material science, can solve the problems of high sintering temperature or resonant frequency temperature coefficient, production and utilization limitations of microwave ceramic materials, low dielectric constant, etc. Good performance and easy operation

Active Publication Date: 2015-07-15
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the microwave ceramic material system with medium dielectric constant mainly includes BaTi 4 o 9 / Ba 2 Ti 9 o 20 system, (Zr, Sn)TiO 4 、BiNbO 4 system, etc., but there are problems such as low relative permittivity (less than 40), high temperature coefficient of sintering temperature or resonance frequency, etc., which limit the production and utilization of microwave ceramic materials

Method used

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  • Microwave dielectric ceramic with medium dielectric constant and low loss

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the ceramic composition expression Zr 0.675 (Mg 1 / 3 Nb 2 / 3 ) 0.325 TiO 4 +0.2wt%MnCO 3 Weigh the raw material ZrO 2 , MgO, Nb 2 o 5 、TiO 2 and MnCO 3 , mixed thoroughly and ball milled at a speed of 200r / min for 4h, then dried at 120°C, passed through a 120-mesh sieve, and then pressed into pieces, kept at 1000°C in an air atmosphere for 4h to obtain a sample briquette; the sample was burned After the block is pulverized, carry out secondary ball milling, the ball milling time is 5h, and dry at 120°C, mix the powder with the aqueous solution of polyvinyl alcohol to make micron-sized spherical particles, pass through the 60-mesh and 120-mesh double-layer sieves Sieve to obtain the required ceramic material with 60 mesh to 120 mesh, press the ceramic material into shape, and sinter at 1280°C for 2 hours in air to obtain a medium dielectric constant and low loss microwave dielectric ceramic material.

[0030] The performance index of the tested ceram...

Embodiment 2

[0032] According to the ceramic composition expression Zr 0.675 (Mg 1 / 3 Nb 2 / 3 ) 0.325 TiO 4 +0.5wt%MnCO 3 Weigh the raw material ZrO 2 , MgO, Nb 2 o 5 、TiO 2 and MnCO 3 , mixed thoroughly and ball milled at a speed of 200r / min for 4h, then dried at 120°C, passed through a 120-mesh sieve, and then pressed into pieces, kept at 1000°C in an air atmosphere for 4h to obtain a sample briquette; the sample was burned After the block is pulverized, carry out secondary ball milling, the ball milling time is 5h, and dry at 120°C, mix the powder with the aqueous solution of polyvinyl alcohol to make micron-sized spherical particles, pass through the 60-mesh and 120-mesh double-layer sieves Sieve to obtain the required ceramic material with 60 mesh to 120 mesh, press the ceramic material into shape, and sinter at 1280°C for 2 hours in air to obtain a medium dielectric constant and low loss microwave dielectric ceramic material.

[0033] The performance index of the tested ceram...

Embodiment 3

[0035] According to the ceramic composition expression Zr 0.65 (Mg 1 / 3 Nb 2 / 3 ) 0.35 TiO 4 +0.2wt%MnCO 3 Weigh the raw material ZrO 2 , MgO, Nb 2 o 5 、TiO 2 and MnCO 3 , mixed thoroughly and ball milled at a speed of 200r / min for 4h, then dried at 120°C, passed through a 120-mesh sieve, and then pressed into pieces, kept at 1000°C in an air atmosphere for 4h to obtain a sample briquette; the sample was burned After the block is pulverized, carry out secondary ball milling, the ball milling time is 5h, and dry at 120°C, mix the powder with the aqueous solution of polyvinyl alcohol to make micron-sized spherical particles, pass through the 60-mesh and 120-mesh double-layer sieves Sieve to obtain the required ceramic material with 60 mesh to 120 mesh, press the ceramic material into shape, and sinter at 1260°C for 2 hours in air to obtain a microwave dielectric ceramic material with a medium dielectric constant and low loss.

[0036] The performance index of the tested ...

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Abstract

The invention discloses a microwave dielectric ceramic with medium dielectric constant and low loss. The ceramic has a composition expression of Zr (1-x) (Mg1 / 3Nb2 / 3) xTiO4+ywt%MnCO3, wherein x and y satisfy the relations of: 0.325<=x<=0.4, 0.2<=y<=0.5, and y represents the mass percentage of MnCO3 in the Zr (1-x) (Mg1 / 3Nb2 / 3) xTiO4. The invention also provides a preparation method of the microwave dielectric ceramic with medium dielectric constant and low loss. The microwave dielectric ceramic with medium dielectric constant and low loss has the advanategs of low sintering temperature, high relative permittivity and quality factor, and resonant frequency close to zero; and the ceramic can be used as a dielectric material such as RF multilayer ceramic capacitor, chip microwave dielectric resonator or filter, ceramic antenna and multi chip module.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to a medium dielectric constant low-loss microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics is a new type of functional ceramic material developed in the past twenty years. It refers to a ceramic material used as a dielectric material in circuits in the microwave frequency band (mainly 300MHz to 300GHz frequency band) and fulfills one or more functions. It is a key material for the manufacture of microwave dielectric filters and resonators. This material is a new type of functional ceramic material developed with the rapid development of the mobile communication industry in recent decades. Its outstanding features are high dielectric constant, low loss, and small temperature coefficient of resonance frequency, and it is used to make dielectric materials. Microwave components such as resonators, dielect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/622C04B35/64
Inventor 周迪李文博庞利霞赵金雄
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU