Microwave dielectric ceramic and preparation method thereof

A microwave dielectric ceramic and a new technology, applied in the field of microwave dielectric ceramics, can solve the problems of difficult large-scale production, damage to the performance of ceramic materials, and density of volatile materials.

Inactive Publication Date: 2014-04-09
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems to be solved in these methods, such as the high production cost of the co-precipitation method, which is difficult to carry out large-scale production, and the uneven microscopic distribution of raw materials in the conventional solid-phase method makes it difficult to fully react to obtain a high-purity target phase; It is easy to introduce impurities, which may damage the performance of ceramic materials; the sintering temperature of ceramics is also high
At the same time, the selection of material preparation method needs to meet certain requirements of the crystal structure and crystal growth of the prepared material. The same preparation method such as sol-gel method will produce different effects when preparing different materials, such as the crystal grain is too small This leads to the volatilization of material components and the poor density of the prepared materials.

Method used

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  • Microwave dielectric ceramic and preparation method thereof
  • Microwave dielectric ceramic and preparation method thereof
  • Microwave dielectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh the raw materials according to the molecular formula of the formula: the molecular formula is K 0.5 Dy 4.5 Ti 4 o 15 , the molecular weight is 1182.3902, the mass of ingredients is 118.2390 g, and the molar number of ingredients is 0.10;

[0035] Weigh the required raw material K 2 CO 3 Mass is 3.490 g; Dy 2 o 3 Mass is 84.216 g, TiO 2 The amount is 36.227 g.

[0036] The preparation method is:

[0037] (1) Put the weighed raw materials into a ball mill jar and mill for 4-48 hours, then put them in a dry box at 80-180 o Tumble dry at C.

[0038] (2) The obtained mixed powder is pre-fired at high temperature to obtain superfine powder. It needs to be heated for 16 hours during pre-burning, and the required temperature is 1100 o C, keep warm for 4 hours.

[0039] (3) After grinding and sieving, add the prepared polyvinyl alcohol glue to the powder, the amount of polyvinyl alcohol added is 10% of the total mass of the raw material design; after pre-pressi...

Embodiment 2

[0041] According to the general formula, the raw materials potassium carbonate, titanium dioxide and holmium oxide were weighed.

[0042] Molecular formula is K 0.5 Ho 4.5 Ti 4 o 15 , the molecular weight is 1193.19, the mass of ingredients is 119.319 g, and the molar number of ingredients is 0.10mol;

[0043] The preparation method is:

[0044] (1) Weigh the required raw material K 2 CO 3 Mass is 3.490 g; Ho 2 o 3 Mass is 85.061 g, TiO 2 The amount is 36.227 g.

[0045] (2) Put the weighed raw materials into a ball mill jar for ball milling for 48 hours, and then put them in a drying oven at 180 o Tumble dry at C.

[0046] (3) The obtained mixed powder is pre-fired at high temperature to obtain superfine powder. During pre-burning, the temperature needs to be raised for 20 hours, and the temperature is raised to the required temperature of 900 o After C, keep warm for 5 hours.

[0047] (4) After grinding and sieving, add the prepared polyvinyl alcohol glue to th...

Embodiment 3

[0049] Weigh the raw materials potassium carbonate, titanium dioxide and erbium oxide according to the general formula.

[0050] Molecular formula is K 0.5 Er 4.5 Ti 4 o 15 , the molecular weight is 1203.8102, the mass of ingredients is 120.3810 g, and the molar number of ingredients is 0.10mol;

[0051] The preparation method is:

[0052] (1) Weigh the required raw material K 2 CO 3 Mass is 3.490 g; Er 2 o 3 Mass is 86.076 g, TiO 2 The amount is 36.227 g.

[0053] (2) Put the weighed raw materials into a ball mill jar and mill them for 4 hours.

[0054] (3) The raw materials after ball milling are placed in a drying oven at 180 o C drying, after drying, pulverization, pre-calcination, grinding, and sieving to obtain powder materials; the obtained mixed powder is pre-calcined at high temperature to obtain ultra-fine powder materials. During pre-calcination, the temperature needs to be raised for 12 hours, and the temperature is raised to 1200 °C. o After C, keep wa...

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PUM

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Abstract

A novel microwave dielectric ceramic and a preparation method of the novel microwave dielectric ceramic belong to a microwave dielectric material and the technical field of microwave dielectric material manufacture. The microwave dielectric ceramic is composed of K, Dy, Ho, Er, Yb, Lu and Ti in modes of carbonate and oxide, a chemical formula of the microwave dielectric ceramic is K0.5Re4.5Ti4O15, and the Re is equal to the Dy, Ho, Er, Yb, Lu in the formula. The novel microwave dielectric ceramic provides a new material containing a rare earth microwave dielectric and expands selecting ranges of microwave dielectric application materials. A matched process is provided for the microwave dielectric ceramic, and the microwave dielectric ceramic with a good ceramic forming ratio is obtained.

Description

technical field [0001] The invention belongs to the technical field of manufacturing microwave dielectric materials, in particular to microwave dielectric ceramics used in microwave devices such as dielectric resonators and multilayer filters in mobile and satellite communication systems. Background technique [0002] Microwave dielectric ceramics are used in microwave, satellite communication, mobile communication, electronic countermeasure equipment, etc. They are key materials for microwave components such as resonators, filters, and dielectric waveguide circuits widely used in modern communications, and play an important role in microwave circuit systems. A series of circuit functions such as dielectric isolation, dielectric waveguide and dielectric resonance. Ideal microwave dielectric ceramics have high relative permittivity, low loss means high quality factor Q · f value (GHz) and temperature coefficient of resonant frequency tending to zero . [0003] In recent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 李正法司平占葛洪良
Owner CHINA JILIANG UNIV
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