Low-temperature sintered LTCC microwave dielectric ceramics material and preparation method thereof

A technology of microwave dielectric ceramics and low-temperature sintering, which is applied in the field of electronic ceramics and its manufacturing, can solve the problems of reducing the size of microwave circuits, etc., and achieve the effects of excellent microwave performance, low inherent sintering temperature, and large dielectric constant

Inactive Publication Date: 2008-07-23
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Microwave dielectric resonators made of high dielectric constant microwave materials can greatly reduce the size of microwave circuits, but the way out for further miniaturization lies in the development of MCM

Method used

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  • Low-temperature sintered LTCC microwave dielectric ceramics material and preparation method thereof
  • Low-temperature sintered LTCC microwave dielectric ceramics material and preparation method thereof
  • Low-temperature sintered LTCC microwave dielectric ceramics material and preparation method thereof

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preparation example Construction

[0043] The above-mentioned low-temperature sintered microwave dielectric ceramic material and its preparation method. Specific steps are as follows:

[0044] 1) The raw material Li 2 CO 3 , Nb 2 o 5 、TiO 2 Moore Billy 2 CO3 : Nb 2 o 5 :TiO 2 = x: 1: y preparation, wherein 5.51+m-n Nb 1-m-3n Ti m+4n o 3 , where 0.1≤m≤0.15, 0.2≤n≤0.25,;

[0045] 2) Mix the prepared chemical raw materials, add alcohol according to the material: alcohol ratio of 1:2, put it into a nylon tank for ball milling for 4 to 8 hours, take it out and dry it at 120°C to 140°C, sieve it and press it into Place the block in an alumina crucible, raise the temperature to 800°C-900°C at a rate of 5°C / min, and keep it warm for 4h-8h to obtain a sintered block.

[0046] 3) Pulverize the sintered block, carry out secondary ball milling and drying for 4-5 hours, and granulate to obtain porcelain material, which is sintered at 1050°C-1150°C for 2-4 hours to obtain low-temperature sintered LTCC Microwave...

Embodiment 1

[0050] The chemical raw material Li 2 CO 3 , Nb 2 o 5 and TiO 2 Moore Billy 2 CO 3 : Nb 2 o 5 :TiO 2 =5.5:1:7 After the preparation, fully mix and ball mill for 4 hours, after grinding, dry at 120°C-140°C, sieve, press into a block, put it in an alumina crucible, and heat it at 5°C / min Raise the heating rate to 900°C, keep it warm for 8 hours, then pulverize the burnt block, ball mill it for the second time, take it out and dry it, then granulate it, and then sieve it with a 70 mesh and 120 mesh screen to obtain the desired ceramic material . After the ceramic material is pressed into shape (sheet or column) as required, and then sintered at 1050°C to 1150°C for 4 hours, the low-temperature sintered LTCC microwave dielectric ceramic material can be obtained. The microwave properties of the material at different sintering temperatures are shown in Table 1.

[0051] Microwave performance under table 1 embodiment 1 different sintering temperatures

[0052] Si...

Embodiment 2

[0054] The chemical raw material Li 2 CO 3 , Nb 2 o 5 and TiO 2 Moore Billy 2 CO 3 : Nb 2 o 5 :TiO 2 =5.5:1:7.5 After the preparation, fully mix and ball mill for 4 hours, grind and dry, sieve, press into a block, put it in an alumina crucible, and raise the temperature to 900°C at a rate of 5°C / min , keep warm for 8 hours, then crush the burnt block, ball mill it for the second time, take it out, dry it and granulate it, and then sieve it with 70-mesh and 120-mesh sieves to obtain the desired ceramic material. After the ceramic material is pressed into shape (sheet or column) as required, and then sintered at 1050°C to 1150°C, a low-temperature sintered LTCC microwave dielectric ceramic material can be obtained. The microwave properties of the material at different sintering temperatures are shown in Table 2.

[0055] Table two: Microwave performance under different sintering temperatures of embodiment 2

[0056] Sintering temperature

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Abstract

The invention discloses a low temperature co-fired ceramic LTCC microwave dielectric ceramic MWCD material, which is prepared by Li2CO3, Nb2O5 and TiO2 by the moral ratio that Li2CO5:Nb2O5:TiO2 = x:1:y, wherein, x is more than 5.5 and less than or equal to 6, y is more than 7 and is less than or equal to 7.5; the expression of structure for the made up modular is Li1+m-nNb1-m-3nTim+4nO3, wherein m is more than or equal to 0.1 and is less than or equal to 0.15, n is more than or equal to 0.2 and less than or equal to 0.25. The LTCC MWCD prepared by the invention has low sintering temperature (approx. 1,100 DEG C) and excellent microwave performance: the dielectric constant (Epsilon r) is that x is more than 32 and less than or equal to 52, Q multiplied by f value is high and Tf is small; the sintering temperature can be decreased to 900 DEG C and the microwave dielectric property can be maintained for excellence without any reaction to a Ag by adding a plurality of low melting point oxides. The pure silver can be taken as a electrode for sintering which can greatly reduce manufacturing cost for the components and applied in manufacturing of the microwave components such as a low temperature co-fired ceramic LTCC system, a multi-layer media resonator, a microwave antenna and a wave filter etc.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its manufacture, in particular to a low-temperature sintered LTCC microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] With the continuous development of electronic information technology in the direction of high frequency and digitalization, the requirements for miniaturization, integration and modularization of components are becoming more and more urgent. LTCC (LowTemperature Co-fired Ceramics) has become one of the main technologies for electronic device modularization due to its excellent electrical, mechanical, thermal and technological characteristics. It has developed rapidly in foreign countries and Taiwan, and has formed an industrial cone . In the past few years, the output value of the global LTCC component market has grown rapidly driven by wireless communication products such as mobile phones, Bluetooth and WLAN, and it is expec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/495C04B35/64
Inventor 汪宏周焕福丁晓言庞利霞周迪姚熹
Owner XI AN JIAOTONG UNIV
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