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Microwave dielectric ceramics with medium dielectric constant and ultra-low dielectric loss, preparation method and application thereof

A technology of microwave dielectric ceramics and ultra-low dielectric, applied in ceramics, inorganic insulators, etc., can solve the problems of large dielectric constant, blank microwave dielectric ceramic system, lack of ultra-low dielectric loss material system, etc., and achieve dielectric The effect of constant enhancement

Active Publication Date: 2020-04-24
宁波猎知乐科技咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the dielectric theory, the dielectric constant and Qf value of materials usually show a negative correlation, that is, the increase of dielectric constant is often accompanied by the decrease of Qf value, so the material system with large dielectric constant and ultra-low dielectric loss at the same time very lacking
On the other hand, although microwave dielectric ceramics have been extensively studied and a series of new microwave dielectric materials are emerging, they have intermediate dielectric constants (40r <70) low-loss microwave dielectric ceramic system is almost blank

Method used

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  • Microwave dielectric ceramics with medium dielectric constant and ultra-low dielectric loss, preparation method and application thereof
  • Microwave dielectric ceramics with medium dielectric constant and ultra-low dielectric loss, preparation method and application thereof
  • Microwave dielectric ceramics with medium dielectric constant and ultra-low dielectric loss, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0027] (1) SrCO 3 、TiO 2 and ZrO 2 Raw material powder (purity 99.99%) according to Sr 2 (Ti 0.975 Zr 0.025 )O 4 Stoichiometric weighing of ingredients;

[0028] (2) Put the chemical raw materials prepared in step (1) into a ball mill tank, add zirconia balls and absolute ethanol ball mill for 24 hours, and pass the 120-mesh sieve after the ball milled powder is dried in a drying oven;

[0029] (3) The powder prepared in step (2) is calcined at 1225° C. for 3 hours, then ball-milled twice, dried and passed through a 120-mesh sieve;

[0030](4) Add 4wt% PVA solution to the powder obtained in step (3) and grind it evenly, pass through a 40 mesh sieve; subsequently, put the gained powder into a stainless steel mold with a diameter of 12mm, and keep the pressure under 98MPa pressure After 5 minutes, a ceramic green body with a thickness of 5 mm was obtained. The obtained ceramic green body was sintered at 1475° C.-1550° C. for 3 hours to finally obtain a ceramic sample. T...

Embodiment 2

[0032] (1) SrCO 3 、TiO 2 and ZrO 2 Raw material powder (purity 99.99%) according to Sr 2 (Ti 0.95 Zr 0.05 )O 4 Stoichiometric weighing of ingredients;

[0033] (2) Put the chemical raw materials prepared in step (1) into a ball mill tank, add zirconia balls and absolute ethanol ball mill for 24 hours, and pass the 120-mesh sieve after the ball milled powder is dried in a drying oven;

[0034] (3) The powder obtained in step (2) is calcined at 1250° C. for 3 hours, then ball-milled twice, and passed through a 120-mesh sieve after drying;

[0035] (4) Add 4wt% PVA solution to the powder obtained in step (3) and grind it evenly, pass through a 40 mesh sieve; subsequently, put the gained powder into a stainless steel mold with a diameter of 12mm, and keep the pressure under 98MPa pressure After 5 minutes, a ceramic green body with a thickness of 5 mm was obtained. The obtained ceramic green body was sintered at 1475° C.-1550° C. for 3 hours to finally obtain a ceramic samp...

Embodiment 3

[0037] (1) SrCO 3 、TiO 2 and ZrO 2 Raw material powder (purity 99.99%) according to Sr 2 (Ti 0.9 Zr 0.1 )O 4 Stoichiometric weighing of ingredients;

[0038] (2) Put the chemical raw materials prepared in step (1) into a ball mill tank, add zirconia balls and absolute ethanol ball mill for 24 hours, and pass the 120-mesh sieve after the ball milled powder is dried in a drying oven;

[0039] (3) The powder obtained in step (2) is calcined at 1250° C. for 3 hours, then ball-milled twice, and passed through a 120-mesh sieve after drying;

[0040] (4) Add 4wt% PVA solution to the powder obtained in step (3) and grind it evenly, pass through a 40 mesh sieve; subsequently, put the gained powder into a stainless steel mold with a diameter of 12mm, and keep the pressure under 98MPa pressure After 5 minutes, a ceramic green body with a thickness of 5 mm was obtained. The obtained ceramic green body was sintered at 1475° C.-1550° C. for 3 hours to finally obtain a ceramic sample...

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Abstract

The invention discloses a microwave dielectric ceramic with middle permittivity and ultralow dielectric loss, and a preparation method and application thereof. The microwave dielectric ceramic is characterized in that the chemical expression formula is Sr2(Ti1-xZrx)O4, wherein x is more than 0 and less than 0.1. The preparation method of the microwave dielectric ceramic comprises the following steps: preparing SrCO3, TiO2 and ZrO2 on the basis of the stoichiometric ratio in the chemical expression formula; performing continuous ball milling for 24h; then drying; screening; roasting the prepared powder for 1-3h under the temperature of 1200-1250; performing secondary ball milling; screening; pressing the prepared powder into a blank; and roasting for 1-3h under the temperature of 1475 to 1550 DEG C to obtain a ceramic block. According to the preparation method, the outstanding permittivity and quality factor combination of the prepared Sr2(Ti0.975Zr0.025)O4 ceramic is superior to thoseof other microwave dielectric material systems, so that the microwave dielectric ceramic can be widely applied to elements of wireless communication equipment, such as a microwave resonator and a microwave filter; and the microwave dielectric ceramic is extremely high in application value in the fields of base station communication and satellite communication.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a microwave dielectric ceramic with medium dielectric constant and ultra-low dielectric loss, a preparation method and an application thereof. Background technique [0002] Microwave dielectric ceramics refer to low-loss, temperature-stable ceramics that are used as dielectric materials in microwave frequency (300MHz-300GHz) circuits and perform one or more functions. With the rapid development of wireless communication technology, microwave dielectric ceramics have been widely concerned as the key materials of microwave resonator devices (including dielectric resonators, filters, oscillators), microwave capacitors and other passive devices. In order to meet the needs of device miniaturization and practicality, while taking into account the cost, such ceramics are required to have a large dielectric constant (ε r ), lower dielectric loss (i.e. higher Qf val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/49
CPCC04B35/49C04B2235/3213C04B2235/442C04B2235/6562C04B2235/6567C04B2235/658C04B2235/96
Inventor 刘兵黄玉辉
Owner 宁波猎知乐科技咨询有限公司
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