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Lithium-magnesium-niobium-aluminum-tungsten microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and lithium magnesium niobium, which is applied in the field of ceramic materials, can solve the problems of high loss of microwave dielectric ceramics, achieve the effects of promoting growth, wide application prospects, and increasing compactness

Inactive Publication Date: 2020-06-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] What the present invention aims to solve is that the existing Li 3 Mg 2 NbO 6 For the technical problem of high loss of microwave dielectric ceramics, a lithium-magnesium-niobium-aluminum-tungsten-based microwave dielectric ceramic and its preparation method are proposed. The ceramic system has excellent performance, low cost and simple preparation process, which can effectively promote the development of microwave devices.

Method used

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  • Lithium-magnesium-niobium-aluminum-tungsten microwave dielectric ceramic and preparation method thereof
  • Lithium-magnesium-niobium-aluminum-tungsten microwave dielectric ceramic and preparation method thereof
  • Lithium-magnesium-niobium-aluminum-tungsten microwave dielectric ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. According to the microwave dielectric ceramic composition Li 3 Mg 2 Nb 0.98 (Al 1 / 3 W 2 / 3 ) 0.02 O 6 , Called Li 2 CO 3 -6.8181g, MgO-4.9587g, Nb 2 O 5 -8.0121g, Al 2 O 3 -0.0209g, WO 3 -0.1902g ingredients, 20g in total; put the mixed raw materials into a nylon tank, add 160ml deionized water and 150g zirconium balls, and then ball mill on a planetary ball mill for 4 hours at a speed of 250 rpm;

[0030] 2. Place the ball milled raw materials in a drying box for drying and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0031] 3. Pre-fire the powder at 925°C and keep it warm for 4 hours;

[0032] 4. Put the pre-burned powder into a nylon tank, add deionized water and zirconium balls, and mill it again for 8 hours. After the material is discharged, it is dried and passed through a 40-mesh sieve; paraffin wax with a mass ratio of 8 wt% is added as a binder. Granulate, then pass through an 80-mesh sieve; then press the powder into a green body with a...

Embodiment 2

[0036] 1. According to the microwave dielectric ceramic composition Li 3 Mg 2 Nb 0.96 (Al 1 / 3 W 2 / 3 ) 0.04 O 6 , Called Li 2 CO 3 -6.8020g, MgO-4.9469g, Al 2 O 3 -0.0417g, WO 3 -0.3794g of ingredients, 20g in total; add the mixed raw materials into a nylon tank, add 160ml of deionized water and 150g of zirconium balls, and mill them on a planetary ball mill for 8 hours at a speed of 250 rpm;

[0037] 2. Place the ball milled raw materials in a drying box for drying and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0038] 3. Pre-burn the powder at 950℃ and keep it warm for 6 hours;

[0039] 4. Put the pre-burned powder into a nylon tank, add deionized water and zirconium balls, and then ball mill for 6 hours. After the material is discharged, it is dried and passed through a 40-mesh sieve; paraffin wax with a mass ratio of 8wt% is added as a binder. Granulate, then pass through an 80-mesh sieve; then press the powder into a green body with a diameter of 10m...

Embodiment 3

[0043] 1. According to the microwave dielectric ceramic composition Li 3 Mg 2 Nb 0.96 (Al 1 / 3 W 2 / 3 ) 0.04 O 6 , Called Li 2 CO 3 -6.8020g, MgO-4.9469g, Al 2 O 3 -0.0417g, WO 3 -0.3794g of ingredients, 20g in total; add the mixed raw materials into a nylon tank, add 160ml of deionized water and 150g of zirconium balls, and then ball mill on a planetary ball mill for 6 hours at a speed of 250 rpm;

[0044] 2. Place the ball milled raw materials in a drying box for drying and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0045] 3. Pre-burn the powder at 975°C and keep it warm for 4 hours;

[0046] 4. Put the pre-burned powder into a nylon tank, add deionized water and zirconium balls, and then ball mill for 6 hours. After the material is discharged, it is dried and passed through a 40-mesh sieve; paraffin wax with a mass ratio of 8wt% is added as a binder. Granulate, then pass through an 80-mesh sieve; then press the powder into a green body with a diameter ...

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a lithium-magnesium-niobium-aluminum-tungsten microwave dielectric ceramic and a preparation method thereof. The chemical expression of the ceramic is Li3Mg2Nb1-x(Al1 / 3W2 / 3)xO6, and x is larger than or equal to 0.02 and smaller than or equal to 0.08. The preparation method comprises the following steps: by adopting asolid-phase synthesis method, mixing Li2CO3, MgO, Nb2O5, Al2O3 and WO3 according to a stoichiometric ratio, carrying out ball milling, drying and sieving, presintering at 925-1000 DEG C to obtain presintered powder, performing ball milling again, drying, sieving and granulating, pressing into a green body, sintering the green body at 1075-1175 DEG C, keeping the temperature, and cooling to room temperature to obtain the required microwave dielectric ceramic. The microwave dielectric ceramic has the advantages of excellent microwave dielectric properties, low cost, simple preparation technique,no toxicity or pollution, and wide application prospects.

Description

Technical field [0001] The invention belongs to the technical field of ceramic materials, and specifically relates to a lithium-magnesium-niobium-aluminum-tungsten microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave refers to electromagnetic waves with a frequency of 300MHz to 300GHz. When microwaves are exposed on the surface of an object, strong reflections occur like light waves. This characteristic of microwaves can be used for accurate tracking of targets by radar systems. Second, high-frequency microwaves can be used for satellite communications. In addition, microwave can realize multi-channel communication transmission, mostly used for wireless wave transmission. [0003] With the development of microwave technology, microwave theoretical knowledge and technology have become one of the most widely used and fastest growing modern high-tech hot fields. In recent years, microwave dielectric ceramics have been used in microwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3203C04B2235/3206C04B2235/3217C04B2235/3251C04B2235/3258C04B2235/656C04B2235/6567C04B2235/96
Inventor 张平孙可欣
Owner TIANJIN UNIV
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