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A low-loss high-strength microwave dielectric ceramic and its preparation method

A technology of microwave dielectric ceramics and high-intensity microwaves, applied in the field of electronic ceramics and its preparation, can solve the problems of low quality factor, unreachable processing strength, high dielectric constant, etc., and achieve high sintering temperature, low loss, and temperature coefficient of resonance frequency adjustable effect

Active Publication Date: 2022-01-25
无锡鑫圣慧龙纳米陶瓷技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, for this type of perovskite structure, microwave dielectric ceramics have a dielectric constant of 50 and a quality factor of about 40,000 GHz when the resonant frequency temperature coefficient is zero, which is too high for current 5G applications. The factor is low and its processing strength cannot reach the standard of microwave dielectric ceramics for 5G

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  • A low-loss high-strength microwave dielectric ceramic and its preparation method

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preparation example Construction

[0024] The present invention also provides a method for preparing low-loss high-strength microwave dielectric ceramics, comprising the following steps:

[0025] (1) TiO 2 and CaCO 3 According to the chemical formula CaTiO 3 The molar ratio of the corresponding elements in the ingredients, the TiO 2 and CaCO 3 After mixing, it is fully ball milled, dried and sieved after ball milling, and then put into a corundum crucible for roasting to obtain CaTiO 3 combination;

[0026] (2) will Sm 2 o 3 and Al 2 o 3 According to the chemical formula SmAlO 3 The molar ratio of the corresponding elements in the ingredients, the Sm 2 o 3 and Al 2 o 3 After mixing, it is fully ball milled, dried and sieved after ball milling, and then put into a corundum crucible for roasting to obtain SmAlO 3 combination;

[0027] (3) TiO 2 , CaCO 3 、Sm 2 o 3 、Al 2 o 3 According to the chemical formula CaSmAlTiO 6 The molar ratio of the corresponding elements in the ingredients, the TiO ...

Embodiment 1

[0036] The preparation method of the low-loss high-strength microwave dielectric ceramic of the present embodiment 1 comprises the following steps:

[0037] (1) TiO 2 and CaCO 3 According to the chemical formula CaTiO 3 The molar ratio of the corresponding elements in the ingredients, the TiO 2 and CaCO 3 After mixing, fully ball mill, dry and sieve after ball milling, then put it into a corundum crucible, and roast at 1100°C for 4 hours to obtain CaTiO 3 combination;

[0038] (2) TiO 2 , CaCO 3 、Sm 2 o 3 、Al 2 o 3 According to the chemical formula CaSmAlTiO 6 The molar ratio of the corresponding elements in the ingredients, the TiO 2 , CaCO 3 、Sm 2 o 3 、Al 2 o 3 After mixing, it is fully ball milled, dried and sieved after ball milling, then put into a corundum crucible, and roasted at 1100 ° C for 4 hours to obtain the chemical formula CaSmAlTiO 6 Compositions;

[0039] (4) CaTiO will be obtained 3 Composition and CaSmAlTiO 6 Composition according to che...

Embodiment 2

[0042] The preparation method of the low-loss high-strength microwave dielectric ceramic of the present embodiment 2 comprises the following steps:

[0043] (1) TiO 2 and CaCO 3 According to the chemical formula CaTiO 3 The molar ratio of the corresponding elements in the ingredients, the TiO 2 and CaCO 3 After mixing, fully ball mill, dry and sieve after ball milling, then put it into a corundum crucible, and roast at 1100°C for 4 hours to obtain CaTiO 3 combination;

[0044] (2) will Sm 2 o 3 and Al 2 o 3 According to the chemical formula SmAlO 3 The molar ratio of the corresponding elements in the ingredients, the Sm 2 o 3 and Al 2 o 3 After mixing, fully ball mill, dry and sieve after ball milling, then put it into a corundum crucible, and roast at 1100°C for 4h to obtain SmAlO 3 combination;

[0045] (3) TiO 2 , CaCO 3 、Sm 2 o 3 、Al 2 o 3 According to the chemical formula CaSmAlTiO 6 The molar ratio of the corresponding elements in the ingredients, t...

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Abstract

The invention discloses a low-loss high-strength microwave dielectric ceramic whose composition expression is xCaTiO 3 ‑ySmAlO 3 ‑(1‑x‑y)CaSmAlTiO 6 , wherein, x, y, (1-x-y) all represent molar ratio, x=0.6, 0≤y<0.4. The invention also discloses a preparation method of low-loss high-strength microwave dielectric ceramics. In the microwave dielectric ceramic provided by the present invention, CaSmAlTiO is used 6 Partial or full replacement of SmAlO 3 , so that the temperature stability can be improved while reducing the dielectric constant, and the processing strength can be increased by increasing the sintering temperature; CaSmAlTiO 6 and SmAlO 3 The dielectric constants of the two substances are similar, and CaSmAlTiO 6 The resonant frequency temperature coefficient is closer to zero, and CaSmAlTiO 6 The hardness is higher, through CaSmAlTiO 6 Partial or full replacement of SmAlO 3 , and adjusting the ratio of the components can obtain a high-hardness ceramic material with a dielectric constant of about 35, low loss and a near-zero temperature coefficient of the resonant frequency.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics and its preparation, and in particular relates to a low-loss high-strength microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics used in microwave frequency band circuits as dielectric materials to complete one or more functions. They are widely used in modern communications, ranging from satellite communications and satellite remote sensing devices to mobile communications, GPS navigation, Television cable systems, etc., have become an indispensable part of modern people's lives. With the rapid development of microwave communication, especially in the coming 5G era, the developed microwave dielectric material loss, temperature stability and processing strength cannot meet the future application requirements, so it is necessary to develop suitable dielectric constant, Microwave dielectric material w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/465C04B35/622C04B35/63
CPCC04B35/465C04B35/622C04B35/6303C04B2235/3208C04B2235/3232C04B2235/3217C04B2235/3224C04B2235/656C04B2235/6567C04B2235/602
Inventor 吉岸王丹王晓慧
Owner 无锡鑫圣慧龙纳米陶瓷技术有限公司
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