Low-dielectric high-Q lithium magnesium phosphate dielectric material and preparation method thereof

A lithium-magnesium-phosphorus-based, dielectric material technology, applied in the field of ceramic materials, can solve the problem of low Q×f value of dielectric materials, and achieve the effects of simple preparation process, excellent microwave dielectric properties, and low cost

Inactive Publication Date: 2019-06-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] What the present invention will solve is that existing LiMgPO 4 Due to the technical problem of low dielectric material Q×f value, a low dielectric high Q lithium-magnesium phosphorus dielectric material and its preparation method are proposed. 2 CO 3 , MgO, NH 4 h 2 PO 4 , Nb 2 o 5 As the main raw material, using the traditional solid-phase method, with Nb 5+ to P 5+ Carry out replacement to increase the Q×f value of lithium-magnesium-phosphorus-based microwave dielectric ceramics

Method used

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  • Low-dielectric high-Q lithium magnesium phosphate dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. According to LiMg(P 0.98 Nb 0.02 )O 4 , called Li 2 CO 3 -5.7538g, MgO-6.2769g, NH 4 h 2 PO 4 -17.5554g, Nb 2 o 5 -0.4140g of ingredients, 30g in total; the mixed powder is added to a polyester tank, after adding 180ml of deionized water and 160g of zirconium balls, ball milled on a planetary ball mill for 3 hours, and the speed of the ball mill is 250 rpm;

[0029] 2. Place the ball-milled raw materials in a drying oven to dry and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0030] 3. First heat the powder to 550°C for 1 hour, and then continue to heat up to 700°C for 4 hours;

[0031] 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 7% paraffin wax as a binder for granulation, and Pass through an 80-mesh sieve; then press a powder tablet press with a pressure of 4MPa to form a green body with a diameter of 10mm and...

Embodiment 2

[0035] 1. According to LiMg(P 0.98 Nb 0.02 )O 4 , called Li 2 CO 3 -5.7538g, MgO-6.2769g, NH 4 h 2 PO 4 -17.5554g, Nb 2 o 5 -0.4140g of ingredients, 30g in total; the mixed powder is added to the polyester tank, after adding 180ml of deionized water and 160g of zirconium balls, ball mill on a planetary ball mill for 1 hour, and the speed of the ball mill is 250 rpm;

[0036]2. Place the ball-milled raw materials in a drying oven to dry and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0037] 3. First heat the powder to 500°C for 2 hours, and then continue to heat up to 700°C for 5 hours;

[0038] 4. Put the calcined powder into a polyester tank, ball mill it for the second time for 7 hours, 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 press a powder tablet press with a pressure of 4MPa to form a green body with a diameter of 10mm and ...

Embodiment 3

[0042] 1. According to LiMg(P 0.96 Nb 0.04 )O 4 , called Li 2 CO 3 -5.7431g, MgO-6.2652g, NH 4 h 2 PO 4 -17.1653g, Nb 2 o 5 -0.8264g of ingredients, 30g in total; the mixed powder was added to a polyester tank, after adding 180ml of deionized water and 160g of zirconium balls, ball milled on a planetary ball mill for 2 hours, and the speed of the ball mill was 250 rpm;

[0043] 2. Place the ball-milled raw materials in a drying oven to dry and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0044] 3. First heat the powder to 550°C for 3 hours, and then continue to heat up to 650°C for 6 hours;

[0045] 4. Put the calcined powder into a polyester tank, ball mill it twice for 8 hours, 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 press a powder tablet press with a pressure of 4MPa to form a green body with a diameter of 10mm and a thicknes...

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PUM

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a low-dielectric high-Q lithium magnesium phosphate dielectric material and a preparation method thereof, wherein the chemical formula of the dielectric material is LiMg(P1-xNbx)O4 (x is greater than or equal to 0.02 and less than or equal to 0.08). The preparation method comprises the following steps: preparing Li2CO3, MgO, NH4H2PO4 and Nb2O5 in proportion; performing primary ball milling and drying and sieving the raw materials; calcining the raw materials at a certain temperature to obtain pre-sintered powder;performing secondary ball milling on the pre-sintered powder, drying, sieving, granulating and sieving the powder and pressing the powder into a green body; sintering the green body at a certain temperature, preserving heat, and cooling the product to room temperature. According to the invention, a traditional solid-phase method is adopted, and P<5+> ions in the LiMgPO4 dielectric material are replaced by Nb<5+>, so that the Q*f value is obviously improved. In addition, the lithium-magnesium-phosphorus dielectric material disclosed by the invention is non-toxic and pollution-free, and meets the environmental protection requirement; and the preparation process is simple, low in cost and suitable for large-scale production. The material is used for manufacturing microwave components such asresonators and filters.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and specifically relates to a ceramic composition characterized by components and a preparation method thereof, in particular to a novel lithium-magnesium-phosphorus-based dielectric material and a preparation method thereof. Background technique [0002] With the rapid development of wireless communication technology, microwave dielectric ceramics have attracted more and more attention because of their specific functions and excellent characteristics in circuits. Microwave dielectric ceramic materials have the advantages of low dielectric constant, low loss, and high resonance frequency stability. They are mainly used as microwave components such as resonators, filters, dielectric antennas, and dielectric waveguide circuits in microwave circuits. The study of new microwave dielectric ceramics provides important material support for microwave circuits. [0003] In recent years, the dem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B35/622
Inventor 张平杨苗苗
Owner TIANJIN UNIV
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