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A kind of microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and powders, applied in sustainable manufacturing/processing, climate sustainability, chemical industry, etc., can solve the problem of unstable temperature coefficient of resonance frequency, low quality of microwave ceramic materials, high pre-firing and sintering temperatures, etc. problems, to achieve the effect of low dielectric constant range, broaden the sintering temperature range, and reduce the sintering densification temperature

Active Publication Date: 2022-07-05
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0003] An object of the first aspect of the present invention is to provide a microwave dielectric ceramic material to solve the problem of high sintering temperature and narrow range, high quality factor, high dielectric constant and resonance frequency of cordierite microwave ceramic materials in the prior art The temperature coefficient instability problem
[0005] An object of the second aspect of the present invention is to solve the problems of high pre-sintering and sintering temperature, narrow sintering range and low quality of prepared microwave ceramic materials in the prior art

Method used

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  • A kind of microwave dielectric ceramic material and preparation method thereof
  • A kind of microwave dielectric ceramic material and preparation method thereof
  • A kind of microwave dielectric ceramic material and preparation method thereof

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preparation example Construction

[0045] figure 1 It is a schematic flow chart of a method for preparing a microwave dielectric ceramic material according to a specific embodiment of the present invention. As a specific embodiment of the present invention, the preparation method of the microwave dielectric ceramic material in this embodiment may include the following steps:

[0046] Step S100, using MgO, ZnO, Al 2 O 3 , MnO 2 and SiO 2 As raw materials, the raw materials are respectively pretreated to obtain raw materials of preset purity;

[0047] Step S200, weighing raw materials meeting the preset purity according to a preset molar ratio and mixing, adding a liquid medium and a grinding medium, and then grinding and drying for the first time;

[0048] Step S300, the powder after the first grinding and drying is ground and sieved, and then pre-fired;

[0049] Step S400, the pre-fired powder is ground and dried for the second time;

[0050] Step S500, sintering the powder after the second grinding and ...

Embodiment 1

[0072] Mg 2 Al 4 Si 5 O 18 (Pure magnesia cordierite) microwave dielectric ceramic material and preparation method thereof, the preparation process comprises the following steps in turn:

[0073] (1) Weighing ingredients: MgO, Al pretreated by calcination and drying 2 O 3 , SiO 2 Raw materials, weigh the ingredients according to the chemical formula.

[0074] (2) One-time ball milling: transfer the ingredients into the ball mill tank, add a certain amount of absolute ethanol as the liquid medium and zirconium dioxide as the grinding medium, put the sealed ball mill tank into the ball mill for ball milling for 12 hours, and set the rotating speed to 240r / min, After ball milling, put the slurry into a tray and move it into an oven to dry to constant weight.

[0075] (3) Pre-sintering: grind the dried powder through a 120-mesh nylon sieve, transfer it into an alumina crucible, and place it in a high-temperature furnace to heat up to 1200°C at a heating rate of 5°C / min for ...

Embodiment 2

[0092] Mg 2 Al 3.9 (Mn 0.5 Zn 0.5 ) 0.1 Si 5 O 18 Microwave dielectric ceramic material and preparation method thereof, the preparation process includes the following steps in sequence:

[0093] (1) Weighing ingredients: MgO, Al pretreated by calcination and drying 2 O 3 , SiO 2 , MnO 2 , ZnO raw materials, weigh the ingredients according to the chemical formula.

[0094] (2) One-time ball milling:

[0095] Transfer the ingredients into the ball mill tank, add a certain amount of anhydrous ethanol as the liquid medium and zirconium dioxide as the grinding medium, put the sealed ball mill tank into the ball mill for 12h, and set the rotating speed to 240r / min. Put in a tray and move to an oven to dry to constant weight.

[0096] (3) Pre-sintering: grind the dried powder through a 120-mesh nylon sieve, transfer it into an alumina crucible, and place it in a high-temperature furnace to heat up to 1150°C at a heating rate of 5°C / min for 4 hours.

[0097] (4) Secondary...

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Abstract

The invention provides a microwave dielectric ceramic material and a preparation method thereof, and relates to the technical field of electronic ceramic components and materials for wireless mobile communication and radio frequency electronic circuit systems. The microwave dielectric ceramic material is a kind of doped Zn 2+ and Mn 4+ The cordierite crystal structure material, Zn 2+ and Mn 4+ Synergistic replacement of Al in the cordierite lattice 3+ . The invention also provides a microwave dielectric ceramic material and a preparation method thereof. The microwave dielectric ceramic material prepared by the preparation method has a sintering temperature of 1250°C to 1400°C, a quality factor of 56428GHz to 150505GHz, a temperature coefficient of -25ppm / °C to -38ppm / °C, and a dielectric constant of 4.4 to 4.7. The material significantly reduces the sintering and densification temperature of various existing cordierite ceramic materials, improves the defect of narrow sintering temperature range of cordierite ceramics, and effectively widens the sintering temperature range of cordierite ceramics. The quality factor of bluestone ceramics can be used as a functional medium for electronic components in 5G / 6G mobile communication and radio frequency electronic circuit systems.

Description

technical field [0001] The invention relates to the technical field of electronic ceramic components and materials for wireless mobile communication and radio frequency electronic circuit systems, in particular to a microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramic (MWDC) is a new multifunctional dielectric material closely related to microwave communication. It can be used as dielectric resonator, filter, antenna, guided wave loop and microstrip line substrate and other functional device materials. Communication applications have been widely used, such as mobile phones, car phones, mobile phones, TV satellite receivers, satellite broadcasting and navigation, radar, radio remote control, etc. With the development and upgrading of the information and communication era, the rise of new technologies such as big data, Internet of Things, 5G / 6G, artificial intelligence, unmanned driving, instant comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B35/622C04B35/638
CPCC04B35/195C04B35/622C04B35/638C04B2235/3206C04B2235/3262C04B2235/3284C04B2235/6562C04B2235/6567C04B2235/6565Y02P20/10
Inventor 宋开新黄志超楼伟超
Owner HANGZHOU DIANZI UNIV
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