Cordierite microwave dielectric material with ultralow dielectric constant and near-zero temperature coefficient of resonance frequency and preparation method of cordierite microwave dielectric material

An ultra-low dielectric constant and resonant frequency technology, applied in the field of cordierite microwave materials and their preparation, can solve the problems of limiting the application of cordierite microwave dielectric ceramics, and achieve the elimination of adverse effects, improvement of resonance temperature coefficient, and low The effect of dielectric constant

Active Publication Date: 2022-08-02
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These disadvantages limit the application of cordierite-based microwave dielectric ceramics

Method used

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  • Cordierite microwave dielectric material with ultralow dielectric constant and near-zero temperature coefficient of resonance frequency and preparation method of cordierite microwave dielectric material
  • Cordierite microwave dielectric material with ultralow dielectric constant and near-zero temperature coefficient of resonance frequency and preparation method of cordierite microwave dielectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A cordierite-based microwave dielectric material with ultra-low dielectric constant and near-zero resonant frequency temperature coefficient, the preparation method thereof comprises the following steps:

[0028] Step 1: According to the molar ratio of SiO 2 :Al 2 O 3 :Li 2 CO 3 :MgO=5:2: x :(2- x ) weigh the raw materials ( x= 0~0.08), take the electronic balance of 1 / 10,000 as the raw material to ensure that the error between the weighing value and the theoretical calculation value is not greater than 0.0005g; place the weighed raw material in a ball mill, use zirconium balls as grinding balls, and Deionized water was used as the ball milling medium, and the ball was milled at a speed of 250 rpm for 4 h. After the ball milling, the slurry was placed in a constant temperature drying box and dried to constant weight for use.

[0029] Step 2: Mash the agglomerated mixed powder obtained in step 1 in a mortar, put it into a crucible for compaction, raise the tempera...

Embodiment 2

[0036] Compared with Example 1 in this example, only the sintering temperature in step 5 was changed from 1380°C to 1400°C, and the rest were the same as those in Example 1. ɛ r value and τ f value, x = 0.02~0.08, ɛ r = 4.44~4.60, τ f = -43~- 7ppm / ℃.

Embodiment 3

[0038] Compared with Embodiment 1, this embodiment is fixed x =0.04, change the value of sintering temperature to 1380~1400℃. The rest are the same as in Example 1, and the obtained samples are ɛ r value and τ f value, ɛ r = 4.42~4.55, τ f = -36~+7ppm / ℃.

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Abstract

The invention discloses a cordierite microwave dielectric material with an ultralow dielectric constant and a near-zero temperature coefficient of resonance frequency, and belongs to the technical field of microwave electronic ceramic materials, the chemical composition of the material is Mg2-xLi2xAl4Si5O18, x is greater than 0 and less than or equal to 0.08, and the preparation method comprises the following steps: weighing MgO, Al2O3, Li2CO3 and SiO2 raw materials according to the stoichiometric ratio of the chemical formula; and then carrying out a series of processes such as ball milling, drying, calcining, secondary ball milling, drying, granulation forming, rubber discharging and sintering, and adopting a solid-phase reaction method. According to the difference of x, the material contains two phases, namely Mg2Al4Si5O18 and MgAl2O4, the material has an adjustable dielectric constant between 4.22 and 4.76 and a near-zero resonance temperature coefficient (-7.0 ppm/DEG C), so that the material has a wide application prospect in the fields of 5G communication, Internet of Things, millimeter wave communication and the like.

Description

technical field [0001] The invention relates to the field of microwave electronic ceramic materials, in particular to a cordierite microwave material with ultra-low dielectric constant and near-zero resonant frequency temperature coefficient characteristics and a preparation method thereof. Background technique [0002] With the rapid development of the new generation of mobile communications, higher requirements have been placed on the signal transmission speed. Ultra-low dielectric constant ( ε r <5) microwave dielectric ceramics have become an important basic material for millimeter waves due to their high frequency of use and fast transmission speed. The relationship between the signal propagation delay time and the dielectric constant is , where, T d is the signal delay time, l is the signal transmission distance, and c is the speed of light. It can be seen from the formula that the smaller the dielectric constant, the shorter the transmission delay time. ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/20C04B35/622
CPCC04B35/20C04B35/622C04B2235/3203C04B2235/3206C04B2235/3217C04B2235/3418C04B2235/5427C04B2235/602C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567Y02P20/10
Inventor 赖元明余俊杰丁宁王凡硕韦舟扬贾勇蒋刚
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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