TiO2-based microwave ceramic substrate material and preparation method and application thereof

Abstract

The invention provides a TiO2-based microwave ceramic substrate material and a preparation method and application thereof. The TiO2-based microwave ceramic substrate material is composed of two crystal phases, namely a ceramic main crystal phase and a second crystal phase, wherein the ceramic main crystal phase is rutile type TiO2, and the second crystal phase is MgTi2O5. Common oxides including ZrO<2>, Nb<2>O<5> and SnO<2> are used as doping agents and enter TiO2 crystal lattices to form a solid solution; and MnCO<3>, CoO, CuO, ZnO and Al<2>O<3> are used as doping agents to play a role in improving the quality factor of the ceramic. The general chemical formula of the material is Ti<1-x>A<x>O<2> + yMgO + zB. The preparation method comprises the steps of burdening, ball milling, granulation, molding and sintering. The TiO2-based microwave ceramic substrate material prepared by the method disclosed by the invention has a relatively high Q*f value (20,000-40,000), a high dielectric constant (80-95) and a series of dielectric constant temperature coefficients (-550 to -900) through laboratory research and tests. The composite ceramic is suitable for manufacturing a substrate materialof a microwave capacitor, and can also be used for manufacturing materials of adjustable microwave devices such as a microstrip filter.

Description

technical field [0001] The invention relates to a microwave ceramic substrate material suitable for microwave capacitors and microstrip filters and a preparation method thereof. The ceramic material is based on rutile TiO 2 It is obtained through modification and belongs to the field of substrate materials for advanced communication components. Background technique [0002] With the rapid development of electronic information technology, the requirements for the integration, reliability, stability and miniaturization of electronic components are getting higher and higher. Today, the fourth generation (4G) communication network has been popularized around the world, and the 5G network has been vigorously promoted because of its advantages such as faster speed, wider network spectrum, and more intelligence. High frequency has become a new trend in the electronics industry. development trend. Ceramic filters are becoming more and more important between system modules and comm...

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Problems solved by technology

However, the article did not study its surface morphology, and could not evaluate whether it could meet the processing requirements of the fine particle structure on the surface of the microstrip filter, and did not test the modified TiO 2 The dielectric temperature coefficient of the ceramic material cannot be determined to meet the actual application requirements

[0005] Currently researched TiO 2 Microwave dielectric ceramic materials are trying their best to pursue their low loss characteristics, but never consider their machinability. Therefore, there is an urgent need to develop a microwave dielectric with simple process, low raw material cost, and low loss characteristics while meeting the requirements of dielectric constant. Ceramic materials, and by controlling the microstructure of microstrip ceramics to achieve precision machining of microstrip ceramics to meet the microstrip process, it can also adapt to the processing technology of ultra-miniature microwave capacitors to meet the application requirements of the high-frequency microwave communication industry

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