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A low-loss rock-salt mineral structure microwave dielectric ceramic and its preparation method

A technology of microwave dielectric ceramics and rock salt mines, applied in the field of microwave dielectric ceramics with low loss rock salt mine structure and its preparation, can solve the problems of large temperature coefficient and dielectric loss

Inactive Publication Date: 2020-09-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on the above research, it can be found that the Li 2 MgTiO 4 Ceramics are a new type of microwave dielectric ceramic system with relatively high application potential. However, due to the large temperature coefficient and dielectric loss, the actual application of this series of material products in the domestic and foreign markets has not yet been seen.

Method used

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  • A low-loss rock-salt mineral structure microwave dielectric ceramic and its preparation method
  • A low-loss rock-salt mineral structure microwave dielectric ceramic and its preparation method
  • A low-loss rock-salt mineral structure microwave dielectric ceramic and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Mixing: According to Li 2 Mg 1+0.33x Ti 1-x Nb 0.67x o 4 (x=0.30) stoichiometric ratio, using a precision balance to take by weighing lithium carbonate (Li carbonate) with a purity of 99.9% 2 CO 3 ) 9.4317g, magnesium oxide (MgO) 5.6585g, titanium oxide (TiO 2 )7.1365g and niobium oxide (Nb 2 o 5) 3.3929g; Pour the weighed powder into the mixing bottle, and add 40g of absolute ethanol and 400g of zirconia grinding balls. The grinding balls with a diameter of 1 cm and a diameter of 0.5 cm are loaded in a mass ratio of 2:1; the mixing bottle of powder, grinding balls and absolute ethanol is placed on the mixer for continuous mixing for about 24 hours, and the mixer The rotation speed is 200 r / min; the mixed slurry and the balls are separated by a coarse screen, and the separated slurry is dried in an oven at 80°C.

[0030] (2) Pre-burning: Put the dried powder in step (1) in a muffle furnace and pre-burn it at 1050°C for 2 hours (the heating and cooling rate...

Embodiment 2

[0037] (1) Mixing: According to Li 2 Mg 1+0.33x Ti 1-x Nb 0.67x o 4 (x=0.25) stoichiometric ratio, using a precision balance to take by weighing lithium carbonate (Li carbonate) with a purity of 99.9% 2 CO 3 ) 9.4989g, magnesium oxide (MgO) 5.6125g, titanium oxide (TiO 2 )7.7007g and niobium oxide (Nb 2 o 5 ) 2.8476g; Pour the weighed powder into the mixing bottle, and add 40g of absolute ethanol and 400g of zirconia grinding balls. The grinding balls with a diameter of 1 cm and a diameter of 0.5 cm are loaded in a mass ratio of 2:1; the mixing bottle of powder, grinding balls and absolute ethanol is placed on the mixer for continuous mixing for about 24 hours, and the mixer The rotation speed is 200 r / min; the mixed slurry and the balls are separated by a coarse screen, and the separated slurry is dried in an oven at 80°C.

[0038] (2) Pre-burning: Put the dried powder in step (1) in a muffle furnace and pre-burn it at 1050°C for 2 hours (the heating and cooling rat...

Embodiment 3

[0045] (1) Mixing: According to Li 2 Mg 1+0.33x Ti 1-x Nb 0.67x o 4 (x=0.35) stoichiometric ratio, using a precision balance to take by weighing lithium carbonate (Li carbonate) with a purity of 99.9% 2 CO 3 ) 9.3655g, magnesium oxide (MgO) 5.7039g, titanium oxide (TiO 2 )6.5802g and niobium oxide (Nb 2 o 5 ) 3.9306g; Pour the weighed powder into the mixing bottle, and add 40g of absolute ethanol and 400g of zirconia grinding balls. The grinding balls with a diameter of 1 cm and a diameter of 0.5 cm are loaded in a mass ratio of 2:1; the mixing bottle of powder, grinding balls and absolute ethanol is placed on the mixer for continuous mixing for about 24 hours, and the mixer The rotation speed is 200 r / min; the mixed slurry and the balls are separated by a coarse screen, and the separated slurry is dried in an oven at 80°C.

[0046] (2) Pre-burning: Put the dried powder in step (1) in a muffle furnace and pre-burn it at 1050°C for 2 hours (the heating and cooling rat...

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Abstract

The invention discloses a microwave dielectric ceramic with low loss and a rock salt mine structure, and a preparation method of the microwave dielectric ceramic. The ceramic material has a composition formula of Li2Mg1+0.33x Ti1-x Nb0.67xO4, wherein x is greater than or equal to 0.25 and less than or equal to 0.35. The preparation method comprises the steps of firstly, blending the raw materialssuch as Li2CO3, MgO, TiO2 and Nb2O5 according to the formula, carrying out ball-milling, drying, sieving, and then carrying out pre-sintering treatment at the temperature of 1050 DEG C; carrying out secondary ball-milling, drying, adding 8wt% of adhesive for granulating, and molding by pressing so as to obtain a green body; sintering the ceramic green body at the temperature of 1400-1450 DEG C byadopting a burying sintering process so as to obtain the high-performance lithium-magnesium-titanium based microwave dielectric ceramic. The microwave dielectric ceramic material has the characteristics that the material has a higher quality factor (Qxf-160,000GHz) and a resonant frequency temperature coefficient close to zero (Tf to -3ppmDEG C). The dielectric constant epsilon r of the prepared material is about 16; the microwave dielectric ceramic has the advantages of simpler preparation technology, environment-friendly preparation process and lower cost, thus being a low-dielectric microwave dielectric material having good development prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation technology of special ceramics, and in particular relates to a low-loss rock-salt mineral structure microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramic (MWDC) refers to a kind of ceramic used as a dielectric material in microwave frequency circuits to complete microwave signal processing, and is a new type of electronic functional ceramic. [0003] With the rapid development of Internet technology, the information capacity is increasing exponentially, the application frequency is developing towards higher frequency bands, and portable terminals and mobile communications are further developing towards miniaturization, high integration and high stability. [0004] At the same time, dielectric resonators, filters, capacitors and other devices need to be further improved in terms of electromagnetic wave reception and transmissio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/465C04B35/634C04B35/64
Inventor 毕金鑫吴海涛杨长红
Owner UNIV OF JINAN