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Intermediate temperature stable microwave dielectric ceramics and preparation method thereof

A microwave dielectric ceramic, temperature-stable technology, applied in the field of electronic ceramics and its preparation, can solve the problems of resonant frequency temperature coefficient shift, unable to guarantee temperature stability, unable to guarantee normal use, etc., to achieve moderate dielectric constant, excellent Microwave dielectric properties, low-cost effects

Inactive Publication Date: 2019-08-20
无锡鑫圣慧龙纳米陶瓷技术有限公司
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  • Description
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  • Application Information

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Problems solved by technology

This shows that the temperature stability of this kind of ceramic is poor, and it cannot be used normally when the temperature changes, which greatly limits its practical application.
The traditional improvement method is to compound it with a ceramic with a positive resonance frequency temperature coefficient, but this method will cause the overall shift of the resonance frequency temperature coefficient of positive and negative temperatures, and still cannot guarantee its good performance at high and low temperatures. temperature stability, and will greatly reduce its quality factor, which is not conducive to practical application

Method used

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  • Intermediate temperature stable microwave dielectric ceramics and preparation method thereof
  • Intermediate temperature stable microwave dielectric ceramics and preparation method thereof

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preparation example Construction

[0020] The present invention also provides a method for preparing intermediate temperature stable microwave dielectric ceramics, comprising the following steps:

[0021] (1) The main material for preparing microwave dielectric ceramics: according to the composition expression aMgTi 1+x o 3 -bCaTiO 3 The molar ratio of each element in MgO, TiO 2 , CaCO 3 Carry out batching separately, mix fully and carry out ball milling, dry and sieve after ball milling, then put into corundum crucible and carry out roasting, obtain main material, wherein, in aMgTi 1+x o 3 -bCaTiO 3 Among them, 0≤x≤0.05, a and b respectively represent the molar ratio, 0.90≤a≤0.95, 0.05≤b≤0.1;

[0022] (3) Prepare the intermediate temperature stable microwave dielectric ceramics: with respect to the quality of the main material, take La respectively according to the mass fraction 2 o 3 and ZnO, the main material and the auxiliary material are mixed, then fully ball milled, then dried, granulated and sie...

Embodiment 1

[0030] This embodiment 1 is used to illustrate the intermediate temperature stable microwave dielectric ceramic and its preparation method of the present invention.

[0031] (1) The main material for preparing microwave dielectric ceramics:

[0032] In this example 1 the composition expression 0.95MgTi 1+x o 3 -0.05CaTiO 3 Among them, x=0, thus, according to the composition expression 0.95MgTiO 3 -0.05CaTiO 3 The molar ratio of each element in MgO, TiO 2 , CaCO 3Carry out batching, perform ball milling after mixing fully, dry after ball milling, sieve, then put into corundum crucible, roast and keep warm at 1100°C for 3 hours to obtain the main ingredient;

[0033] (2) Prepare the intermediate temperature stable microwave dielectric ceramic:

[0034] In this example, La 2 o 3 The mass fraction relative to the main material is 0%, and the mass fraction of ZnO relative to the main material is 0%; thus in this embodiment one, the main material in step (1) is fully ball-m...

Embodiment 2

[0036] (1) The main material for preparing microwave dielectric ceramics:

[0037] In this example 2 the composition expression 0.95MgTi 1+x o 3 -0.05CaTiO 3 Among them, x=0.01, thus, according to the composition expression 0.95MgTi 1.01 o 3 -0.05CaTiO 3 The molar ratio of each element in MgO, TiO 2 , CaCO 3 Carry out batching, perform ball milling after mixing fully, dry after ball milling, sieve, then put into corundum crucible, roast and keep warm at 1100°C for 3 hours to obtain the main ingredient;

[0038] (2) Prepare the intermediate temperature stable microwave dielectric ceramic: in this embodiment 2, La 2 o 3 The mass fraction relative to the main material is 0%, and the mass fraction of ZnO relative to the main material is 0%; thus in this embodiment one, the main material in step (1) is fully ball-milled again, and then dried, manufactured Granulate and sieve, press the sifted mixed powder into a cylinder with a diameter of 10mm and a height of 6mm, and fin...

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Abstract

The invention discloses intermediate temperature stable microwave dielectric ceramics. The intermediate temperature stable microwave dielectric ceramics is formed by sintering a main material and auxiliary materials. The composition expression of the main material is aMgTil+xO3-bCaTiO3, wherein x is less than or equal to 0.05 and greater than or equal to 0; and a and b respectively represent molarratio, a is less than or equal to 0.95 and greater than or equal to 0.90, b is less than or equal to 0.1 and greater than or equal to 0.05, and a+b equals to 1. The auxiliary materials are La2O3 andZnO, wherein La2O3 accounts for 0-1 wt% of mass of the main material and ZnO accounts for 0-0.1 wt% of mass of the main material. The invention also discloses a preparation method of the intermediatetemperature stable microwave dielectric ceramics. The intermediate temperature stable microwave dielectric ceramics has excellent microwave dielectric properties, has good temperature stability at both high temperature and low temperature, and has a wide application prospect. In addition, raw materials for the preparation are nontoxic, the cost is low, and the preparation process is simple.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics and its preparation, and in particular relates to a medium temperature stable microwave dielectric ceramic. Background technique [0002] Microwave dielectric material is a new type of functional electronic ceramic material developed rapidly in the last 20 years. It is the key material in microwave devices such as filters, duplexers, resonators and dielectric waveguide circuits. It is widely used in microwave communication equipment such as satellite communication, mobile communication, electronic countermeasures and airborne communication. It is the leading material for current dielectric materials. One of the hot spots. [0003] With the continuous development of mobile communication technology, higher requirements are put forward for the miniaturization and high quality of microwave devices, which requires microwave dielectric ceramic materials to meet the following requirements: (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/622C04B35/626
CPCC04B35/465C04B35/622C04B35/62605C04B2235/3227C04B2235/3284C04B2235/602C04B2235/6567
Inventor 王丹吉岸王晓慧
Owner 无锡鑫圣慧龙纳米陶瓷技术有限公司
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