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Aluminum molybdate-based microwave dielectric composite ceramic and preparation method thereof

A technology of microwave dielectric and composite ceramics, which is applied in the field of aluminum molybdate-based microwave dielectric composite ceramics and its preparation, can solve problems such as low dielectric constant, achieve low dielectric constant, no abnormal growth of crystal grains, and simple preparation process Effect

Inactive Publication Date: 2018-11-02
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, molybdate-based microwave dielectric ceramics with low dielectric constant and near-zero frequency temperature coefficient have been rarely reported.

Method used

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  • Aluminum molybdate-based microwave dielectric composite ceramic and preparation method thereof
  • Aluminum molybdate-based microwave dielectric composite ceramic and preparation method thereof

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preparation example Construction

[0040] The corresponding preparation method of aluminum molybdate-based microwave dielectric composite ceramics proposed by the present invention comprises the following steps and contents:

[0041] (1) First, according to Al 2 Mo 3 o 12 The stoichiometric ratio weighs high-purity Al 2 o 3 and MoO 3 powder; then, put it into the ball mill tank, and add deionized water as solvent, high wear-resistant ZrO 2 The balls are balls for ball milling; after the obtained slurry is dried, it is put into a muffle furnace for calcination to obtain the Al 2 Mo 3 o 12 Precursor. spare.

[0042] (2) Al synthesized with step (1) 2 Mo 3 o 12 The precursor is the matrix, and one or more of titanium dioxide, calcium titanate, strontium titanate, samarium sodium titanate, and strontium calcium titanate powder are used as additives, according to the molar ratio of precursor powder to additive powder (0.5~1) : The ratio of (0.1~0.6) weighs each raw material; Then, put into the ball mill...

Embodiment 1

[0051] Example 1: First weigh 1 mole of analytically pure Al 2 o 3 and 3 moles of analytically pure MoO 3 powder, and then put them into the ball mill tank of the high-energy stirring ball mill, and weigh the high wear-resistant ZrO in the ratio of 2:10:5 by the mass ratio of mixed powder, balls, and solvent. 2 Add the balls and deionized water into the ball mill tank, and mix for 18 hours. After the ball milling is completed, the obtained slurry is moved to an oven, heated to 120° C., kept at a temperature of 4 hours, and dried in an atmospheric environment. Then, the dried powder cake was calcined in a muffle furnace with a heating rate of 15°C / min, a calcining temperature of 760°C, a heat preservation of 5 hours, and finally cooling with the furnace. Calcined and crushed Al 2 Mo 3 o 12 The powder of the precursor is put back into the ball mill tank of the clean high-energy stirring ball mill, and press Al2 Mo 3 o 12 Weigh analytically pure TiO at a ratio of 0.7:0.3 ...

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Abstract

The invention relates to an aluminum molybdate-based microwave dielectric composite ceramic and the preparation method thereof, which belongs to the field of high-tech functional ceramics and the application thereof, the aluminum molybdate-based microwave dielectric composite ceramics proposed by the invention is made with Al2Mo3O12 as the matrix and one or more of titanium dioxide, calcium titanate, strontium titanate, samarium sodium titanate and strontium-calcium titanate as the additive(s) through high temperature sintering, according to the preparation method provided by the invention, the aluminum molybdate-based microwave dielectric composite ceramics can be prepared by a two-step heat treatment method: firstly synthesizing Al2Mo3O12 precursor by using Al2O3 and MoO3 powders as rawmaterials at high temperature, and add the additive(s) with the Al2Mo3O12 precursor as the substrate before high temperature sintering, after that the aluminum molybdate-based microwave dielectric composite ceramics can finally be obtained, the aluminum molybdate-based microwave dielectric composite ceramic prepared by the invention has the advantages of high density, uniform and controllable grain size, low sintering temperature, small dielectric constant, high quality factor and temperature coefficient being near zero, and is particularly suitable for being used as a very low loss material in low temperature co-firing technology.

Description

technical field [0001] The invention relates to an aluminum molybdate-based microwave dielectric composite ceramic and a preparation method thereof, belonging to the field of high-tech functional ceramics and its application. Background technique [0002] The development of wireless communication technology has put forward higher requirements for electronic information equipment. Among them, low-temperature co-fired ceramic technology (LTCC), as an effective electronic component and substrate manufacturing technology, promotes wireless communication systems to high frequency, miniaturization and Multifunctional development. Low-temperature co-fired ceramics can embed different components or metals inside the ceramics, sinter them together at a lower temperature, and achieve high-density packaging in three-dimensional space, becoming one of the important basic technologies for device modularization. At present, low-temperature co-fired ceramic technology is widely used in mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/3217C04B2235/3232C04B2235/3234C04B2235/3236
Inventor 符秀丽任俊卿彭志坚
Owner BEIJING UNIV OF POSTS & TELECOMM
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