A kind of microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and dielectrics, applied in ceramics, inorganic insulators, etc., can solve problems such as effects and controllability need to be improved

Inactive Publication Date: 2020-01-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] At present, by doping B in Li-Nb-Ti system ceramic materials 2 o 3 And other sintering aids can improve the temperature coefficient of frequency while reducing the sintering temperature, but its effect and controllability need to be improved

Method used

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  • A kind of microwave dielectric ceramic material and preparation method thereof
  • A kind of microwave dielectric ceramic material and preparation method thereof
  • A kind of microwave dielectric ceramic material and preparation method thereof

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preparation example Construction

[0017] The preparation method includes the following steps:

[0018] Step 1, the raw material Li 2 CO 3 , Nb 2 O 5 , TiO 2 And CaCO 3 Powder according to chemical formula LiNb 0.6 Ti (0.5-x) Ca x O 3 (x=0.01-0.1) Ingredients, planetary ball milling with deionized water as medium for 5 hours, drying at 100℃ after taking out, sieving with 60 mesh screen, and then pre-burning at 870℃ for 4 hours to synthesize the main LNT raw material whose crystal phase is M phase;

[0019] Step 2. Use deionized water as the medium to mill the above LNT raw material planetary ball for 5 hours, take it out and dry it at 100°C, add PVA solution with 4% of it as a binder to granulate, press and shape, and finally at 1100°C Sintered in the atmosphere for 2 hours to prepare doped and modified LiNb 0.6 Ti (0.5-x) Ca x O 3 (x=0.01-0.1) Ceramic material.

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Abstract

The invention belongs to the field of electronic ceramics and its manufacture, in particular to a microwave dielectric ceramic material and its preparation method, which is LiNb 0.6 Ti 0.5 o 3 The system material is modified by doping to control its frequency temperature coefficient. Its raw material composition is LiNb formulated according to non-stoichiometric ratio 0.6 Ti (0.5‑x) Ca x o 3 , x=0.01-0.1. by LiNb 0.6 Ti 0.5 o 3 Microwave dielectric ceramic material doped with CaCO 3 Powder method to obtain the main crystal phase as Li 1.075 Nb 0.625 Ti 0.450 o 3 , the second phase is Ca 5 Nb 4 Ti 3 o 21 Microwave dielectric ceramic LiNb 0.6 Ti (0.5‑x) Ca x o 3 ; It has a high dielectric constant of 60-100 to facilitate the miniaturization of devices, a high quality factor Q×f value of 2000-5000GHz and a controllable and low frequency temperature coefficient of 20-78ppm / ℃.

Description

Technical field [0001] The invention belongs to the field of electronic ceramics and its manufacturing, and specifically relates to a microwave dielectric ceramic material and a preparation method thereof, which is LiNb 0.6 Ti 0.5 O 3 The system material is modified by doping to control its frequency temperature coefficient. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials and perform one or more functions in microwave (300MHz to 300GHz) frequency band circuits. They are the key basic materials in modern communication technology and are widely used in dielectric resonators and filters. , Dielectric substrates, dielectric waveguide circuits, microwave capacitors, duplexers, antennas and other microwave components. [0003] The dielectric ceramics used in the microwave frequency band should meet the following requirements: (1) Suitable dielectric constant to facilitate the miniaturization of the device (the size of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/495C04B35/63
CPCC04B35/495C04B35/6303C04B2235/3203C04B2235/3208C04B2235/3232C04B2235/602C04B2235/656C04B2235/6567C04B2235/6583
Inventor 李恩竹孙怀宝杨鸿宇张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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