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Lead-free high-dielectric-constant microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic and high dielectric constant technology, applied in the field of functional ceramic materials, can solve the problems of polluting the environment and high cost, and achieve the effects of high dielectric constant, reducing dielectric loss, and reducing the number of free electrons

Active Publication Date: 2014-09-24
FUJIAN TORCH ELECTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above systems either contain harmful substances such as Pb, or the sintering temperature is between 1300 ° C and 1400 ° C. If the MLCC is made, not only the inner electrode of pure Pd must be used, which is expensive and pollutes the environment.

Method used

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  • Lead-free high-dielectric-constant microwave dielectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Weigh 21.85g BaCO respectively 3 , 37.26g Nd 2 o 3 and 40.89g TiO 2 , mixed ball milling, passing through a 40-mesh standard sieve, passing through a 40-mesh standard sieve, and calcining at 1160 ° C for 4 hours to synthesize a barium-neodymium-titanium compound;

[0040] (2) Accurately weigh 85.37gBi 2 o 3 and 14.63TiO 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 800°C for 2 hours to synthesize Bi 2 TiO 5 compound;

[0041] (3) Accurately weigh 55.62g CaCO 3 and 44.38TiO 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 1270°C for 2 hours to synthesize CaTiO 3 compound;

[0042] (4) Weigh 73.17g ZnO and 26.83g SiO respectively 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 850°C for 2 hours to synthesize Zn 2 SiO 4 compound.

[0043] (5) Weigh 69.31g Ba(OH) respectively 2 `6H 2 O and 30.69gH ...

Embodiment 2

[0046] (1) Weigh 21.85g BaCO respectively 3 , 37.26g Nd 2 o 3 and 40.89g TiO 2 , mixed ball milling, passing through a 40-mesh standard sieve, and calcining at 1180°C for 4 hours to synthesize a barium-neodymium-titanium compound;

[0047] (2) Accurately weigh 74.47gBi 2 o 3 and 25.53TiO 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 850°C for 2 hours to synthesize Bi 2 Ti2O 7 compound;

[0048] (3) Accurately weigh 55.62g CaCO 3 and 44.38TiO 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 1260°C for 2 hours to synthesize CaTiO 3 compound;

[0049] (4) Weigh 57.69g ZnO and 42.31g SiO respectively 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 900°C for 2 hours to synthesize ZnSiO 3 compound.

[0050] (5) Weigh 39.14gCuO and 60.86gH respectively 3 BO 3 Ball milling, drying, crushing, passing through a 40-me...

Embodiment 3

[0053] (1) Weigh 21.85g BaCO respectively 3 , 37.26g Nd 2 o 3 and 40.89g TiO 2 , mixed ball milling, passed through a 40-mesh standard screen, and calcined at 1160°C for 4 hours to synthesize a barium-neodymium-titanium compound;

[0054] (2) Accurately weigh 79.55gBi 2 o 3 and 20.45gTiO 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 800°C for 2 hours to synthesize Bi 4 Ti 3 o 12 compound;

[0055] (3) Accurately weigh 55.62g CaCO 3 and 44.38TiO 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 1270°C for 2 hours to synthesize CaTiO 3 compound;

[0056] (4) Weigh 73.17g ZnO and 26.83g SiO respectively 2 , mixed by ball milling, dried, crushed, passed through a 40-mesh standard sieve, and calcined at 850°C for 2 hours to synthesize Zn 2 SiO 4 compound.

[0057] (5) Weigh 69.31g Ba(OH) respectively 2 `6H 2 O and 30.69gH 3 BO 3 Ball milling, drying, crushing,...

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Abstract

The invention provides a lead-free high-dielectric-constant microwave dielectric ceramic material and a preparation method of the lead-free high-dielectric-constant microwave dielectric ceramic material. The lead-free high-dielectric-constant microwave dielectric ceramic material mainly comprises an xBaO yNd2O3 zTiO2 compound, a bismuth titanium compound, MTiO3, a silicon zinc compound and NB2O4. The preparation method of the material includes the steps that xBaO yNd2O3 zTiO2 is used as a main base material, the bismuth titanium compound, the MTiO3, the silicon zinc compound and the NB2O4 are used as auxiliary materials, water is used as a dispersion medium, ball-milling, drying, crushing and pelleting are conducted, pelletized powder is pressed into wafer green bodies, the wafer green bodies are heated to the temperature from1100 DEG C to 1200 DEG C in an air atmosphere and sintered for 2 h to 4 h at the temperature, and then the lead-free high-dielectric-constant microwave dielectric ceramic material is prepared. The prepared ceramic material can be used for manufacturing a monolithic ceramic capacitor with high frequency and good thermal stability, is environmentally friendly and has great market value.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a lead-free high dielectric constant temperature stable microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency circuits and perform one or more functions. In recent years, with the rapid development and increasing popularity of modern communication technologies such as mobile communications, satellite communications, global satellite positioning systems, military radars, electronic countermeasures, early warning systems, and wireless local area networks, microwave dielectric ceramic microwave components have a great impact At the same time, it also puts forward higher requirements for microwave dielectric ceramic microwave components in terms of miniaturization, integration, high capacity, high frequency, ...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 吴金剑黄祥贤林志盛
Owner FUJIAN TORCH ELECTRON TECH CO LTD
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