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Temperature-stable low-cost microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and ceramic materials, which is applied in the field of low-cost temperature-stable microwave dielectric ceramic materials and preparation, can solve the problems of high cost and energy waste, achieve high Q×f value, excellent microwave performance, and low sintering temperature Effect

Inactive Publication Date: 2012-04-18
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials usually require a high densification temperature (≥1600°C), resulting in a huge waste of energy. At the same time, Ta is a noble metal and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1) First, Li with a purity ≥ 99% 2 CO 3 , ZnO and TiO 2 Moore Billy 2 CO 3 :ZnO:TiO 2 = 1:1:3 to prepare the main powder;

[0013] 2) Then mix the prepared main powder evenly, add alcohol to the main powder according to the mass ratio of main powder and alcohol as 1:1, use wet grinding method to mix for 4 hours, grind it and bake it at 140°C Dry, sieve with 80-mesh sieve, press into block after sieving, then raise the pressed block raw material from room temperature to 900°C at a heating rate of 5°C / min and keep it at this temperature for 4 hours to prepare into a burnt block;

[0014] 3) Pulverize the burnt block made above to obtain Li 2 ZnTi 3 o 8 powder, and then mole ratio Li 2 ZnTi 3 o 8 :TiO 2 =0.975:0.025 Add TiO to its powder 2 To obtain the powder, add alcohol to the powder according to the mass ratio of the powder and alcohol as 1:1, put it into a nylon tank for ball milling for 4 hours, take it out, put it in an oven and dry it at 140°C, and pr...

Embodiment 2

[0016] 1) First Li 2 CO 3 , ZnO and TiO 2 Moore Billy 2 CO 3 :ZnO:TiO 2 = 1:1:3 to prepare the main powder;

[0017] 2) Then mix the prepared main powder evenly, add alcohol to the main powder according to the mass ratio of main powder and alcohol as 1:1, use wet grinding method to mix for 4 hours, grind it and bake it at 140°C Dry, sieve with 80-mesh sieve, press into block after sieving, then raise the pressed block raw material from room temperature to 900°C at a heating rate of 5°C / min and keep it at this temperature for 4 hours to prepare into a burnt block;

[0018] 3) Pulverize the burnt block made above to obtain Li 2 ZnTi 3 o 8 powder, and then mole ratio Li 2 ZnTi 3 o 8 :TiO 2 =0.95:0.05 Add TiO to its powder 2 To obtain the powder, add alcohol to the powder according to the mass ratio of the powder and alcohol as 1:1, put it into a nylon tank for ball milling for 4 hours, take it out, put it in an oven and dry it at 140°C, and press it into A small cy...

Embodiment 3

[0020] 1) First Li 2 CO 3 , ZnO and TiO 2 Moore Billy 2 CO 3 :ZnO:TiO 2 = 1:1:3 to prepare the main powder;

[0021] 2) Then mix the prepared main powder evenly, add alcohol to the main powder according to the mass ratio of main powder and alcohol as 1:1, use wet grinding method to mix for 4 hours, grind it and bake it at 140°C Dry, sieve with 80-mesh sieve, press into block after sieving, then raise the pressed block raw material from room temperature to 900°C at a heating rate of 5°C / min and keep it at this temperature for 4 hours to prepare into a burnt block;

[0022] 3) Pulverize the burnt block made above to obtain Li 2 ZnTi 3 o 8 powder, and then mole ratio Li 2 ZnTi 3 o 8 :TiO 2 =0.925:0.075 Add TiO to its powder 2 To obtain the powder, add alcohol to the powder according to the mass ratio of the powder and alcohol as 1:1, put it into a nylon tank for ball milling for 4 hours, take it out, put it in an oven and dry it at 140°C, and press it into A small ...

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Abstract

The invention discloses a temperature-stable low-cost microwave dielectric ceramic material and a preparation method thereof. The microwave dielectric ceramic material has the following chemical composition formula of (1-x)Li2ZnTi3O8+xM, wherein x is more than or equal to 0.025 and less than or equal to 0.1, and M is TiO2 or CaTiO3. The preparation method comprises the following steps of: taking LiCO3, ZnO and TiO2 of which the purity is more than or equal to 99% as the main raw material at the following molar ratio: 1 mole of Li2CO3, 1 mole of ZnO and 3 moles of TiO2; pre-calcining to synthesize the main powder body of Li2ZnTi3O8; and then, adding TiO2 or CaTiO3 in the main powder body to regulate the temperature coefficient of resonance frequency of the main powder body so as to obtain the microwave dielectric material of which the dielectric constant, the Q*f value and the temperature coefficient of resonance frequency approach to zero. The sintering temperature of the microwave dielectric ceramic prepared with the preparation method is lower than 1100DEG C, the dielectric constant is 26-31, the Q*f value is 40000-70000GHz, and the temperature coefficient (tau f) of resonance frequency is small. The temperature-stable low-cost microwave dielectric ceramic material can be used for manufacturing microwave devices, such as resonators, antennae, filters and the like.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its manufacture, and relates to a low-cost temperature-stable microwave dielectric ceramic material and a preparation method. Background technique [0002] Microwave dielectric ceramics are a new type of functional ceramics developed in the past 30 years. They mainly refer to ceramics that are used as dielectric materials in microwave frequency band circuits and perform one or more functions. Microwave dielectric ceramics with high dielectric constant, low dielectric loss, and near-zero resonant frequency temperature coefficient can be used to manufacture microwave components such as dielectric resonators, filters, dielectric antennas, frequency-stabilized oscillators, and chip capacitors, and are widely used in Communication, radar, navigation, electronic countermeasures, guidance, global satellite positioning system (GPS) and other fields have become the key basic materials of modern commu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 陈秀丽周焕福刘群文唐莹方亮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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