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High-heat-stability high-Q-value lithium-magnesium-niobium microwave dielectric ceramic

A technology of microwave dielectric ceramics and thermal stability, which is applied in the field of ceramic compositions, can solve the problems of large temperature coefficient of resonance frequency and low Q×f value, improve the temperature coefficient of resonance frequency, increase Q×f value, and simplify the preparation process Effect

Inactive Publication Date: 2017-06-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects that the existing lithium-magnesium-niobium series microwave dielectric ceramics have a relatively low Q × f value and a large temperature coefficient of resonance frequency, and provide a 2 CO 3 , MgO, Nb 2 o 5 as the main raw material, plus a small amount of MnCO 3 Doping and modifying lithium-magnesium-niobium ceramics greatly improves the microwave dielectric properties of lithium-magnesium-niobium-based microwave dielectric ceramics

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] According to the microwave dielectric ceramic composition Li 3 (Mg 0.98 mn 0.02 ) 2 NbO 6 , called Li 2 CO 3 -10.1581g, MgO-7.2390g, Nb 2 o 5- -12.1806g, MnCO 3 -0.4214g of ingredients, 30g in total; the mixed powder was added to the polyester tank, after adding 160ml of deionized water and 150g of zirconium balls, ball milled on a planetary ball mill for 6 hours, and the speed of the ball mill was 1000 rpm;

[0025] 2. Put the ball-milled raw material in a drying oven, dry at 120°C and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0026] 3. Calcinate the powder at 925°C for 4 hours;

[0027] 4. Put the calcined powder into a polyester tank, ball mill it for 6 hours for the second time, dry it after discharge, and pass through a 40-mesh sieve; then add 8% paraffin wax as a binder for granulation, and Pass through an 80-mesh sieve; then use a powder tablet press to press into a green body with a diameter of 10mm and a thickness of 5m...

Embodiment 2

[0031] 1. According to the microwave dielectric ceramic composition Li 3 (Mg 0.96 mn 0.04 ) 2 NbO 6 , called Li 2 CO 3 -10.0663g, MgO-7.0281g, Nb 2 o 5 -12.0705g, MnCO 3 -0.8352g of ingredients, 30g in total; the mixed powder was added to the polyester tank, after adding 160ml of deionized water and 150g of zirconium balls, ball milled on a planetary ball mill for 6 hours, and the speed of the ball mill was 1000 rpm;

[0032] 2. Put the ball-milled raw material in a drying oven, dry at 120°C and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0033] 3. Calcinate the powder at 925°C for 4 hours;

[0034] 4. Put the calcined powder into a polyester tank, ball mill it for 6 hours for the second time, dry it after discharge, and pass through a 40-mesh sieve; then add 8% paraffin wax as a binder for granulation, and Pass through an 80-mesh sieve; then use a powder tablet press to press into a green body with a diameter of 10mm and a thickness of 5m...

Embodiment 3

[0038] 1. According to the microwave dielectric ceramic composition Li 3 (Mg 0.94 mn 0.06 ) 2 NbO 6 , called Li 2 CO 3 -9.9761g, MgO-6.8200g, Nb 2 o 5 -11.9624g, MnCO 3 -1.2415g of ingredients, 30g in total; the mixed powder is added to a polyester tank, after adding 160ml of deionized water and 150g of zirconium balls, ball milled on a planetary ball mill for 6 hours, and the speed of the ball mill is 1000 rpm;

[0039] 2. Put the ball-milled raw material in a drying oven, dry at 120°C and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0040] 3. Calcinate the powder at 925°C for 4 hours;

[0041] 4. Put the calcined powder into a polyester tank, ball mill it for 6 hours for the second time, dry it after discharge, and pass through a 40-mesh sieve; then add 8% paraffin wax as a binder for granulation, and Pass through an 80-mesh sieve; then use a powder tablet press to press into a green body with a diameter of 10mm and a thickness of 5mm w...

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Abstract

The invention discloses a high-heat-stability high-Q-value lithium-magnesium-niobium microwave dielectric ceramic. The microwave dielectric ceramic is prepared by the following steps: proportioning Li2CO3, MgO, Nb2O5 and MnCO3 as raw materials according to the stoichiometric proportion of Li3(Mg[1-x]Mnx)2NbO6 (0.02<=x<=0.08); carrying out ball milling, drying and screening, calcining at 925 DEG C, and carrying out secondary ball milling, granulation and compression molding to obtain a billet; and sintering the billet at 1075-1200 DEG C, thereby obtaining the high-heat-stability high-Q-value lithium-magnesium-niobium microwave dielectric ceramic. Different contents of Mn<2+> are adopted to replace Mg<2+> to obtain excellent microwave dielectric properties: the relative dielectric constant is 15.22, the Q*f value is 110.582 GHz, and the temperature coefficient of resonance frequency is -4.57 ppm / DEG C. The microwave dielectric ceramic has the advantages of simple preparation technique and no pollution in the process, and is a promising novel high-heat-stability high-Q-value microwave dielectric material.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a novel heat-stable high-Q lithium-magnesium-niobium series microwave dielectric ceramic and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the wireless communication industry, the carrier frequency of microwave circuits has increased to the microwave frequency band, and the demand for high-Q microwave materials with better frequency selection characteristics is constantly rising. At the same time, in order to ensure the stable operation of microwave devices in different environments, it is becoming more and more urgent to develop new microwave materials with better temperature stability. And in order to allow microwave materials to have both high-Q and high-reliability characteristics in practical applications, research and development of new thermally stable high-Q microwave ceramics has become an im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495
CPCC04B35/495C04B2235/3206C04B2235/3262C04B2235/442C04B2235/96
Inventor 张平刘路赵永贵
Owner TIANJIN UNIV
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