A graphite electrode functional ceramic device and its preparation method

A technology of graphite electrodes and functional ceramics, applied in the field of functional ceramic materials, can solve the problems of low product qualification rate and poor firmness of silver electrodes, and achieve the effects of improving electrical performance, solving poor firmness and uniform coating.

Inactive Publication Date: 2009-10-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to replace precious metal silver with cheap graphite material, reduce the production cost of silver-containing electrode devices, simplify the production process, and solve the technical problems of poor firmness and low product qualification rate of silver electrodes in the past in the welding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Will be polished and cleaned on both sides (Na 0.535 K 0.480 ) 0.942 Li 0.058 )NbO 3 -0.01CuO piezoelectric ceramic disc is placed as a substrate in a vacuum of 2×10 -4 Pa magnetron sputtering device, the substrate temperature is room temperature. Use Ar + After being accelerated by an electric field, high-energy incident particles hit the graphite target, causing the graphite atoms to leave the target and be sputtered out. The graphite electrode film is attached, accumulated, and deposited on a ceramic substrate placed a few centimeters away from the surface of the target. Sputtering time is 2 hours, and finally the film thickness is 700nm, the particle size is 200-300nm, and the conductivity is 0.813×10 5 S / m graphite, then annealed at 500℃ for 30min. Then put it in silicone oil and heat it to 120°C, keep it for 50min at a voltage of 4kV / mm for polarization, and finally drop to room temperature to test the related performance.

[0021] The test results of each performance...

Embodiment 2

[0024] Bi that has been polished and cleaned on both sides 0.5 Na 0.5 TiO 3 The piezoelectric ceramic disc is placed as a substrate in a vacuum of 2×10 -4In the Pa pulsed laser deposition device, heat the substrate to 200°C, turn on the flash molecule pulsed laser, introduce the pulsed laser into the vacuum growth chamber, and focus on the graphite target. The target absorbs the high energy of the laser beam and instantly melts and evaporates the graphite. Feather clusters are deposited on the substrate to grow a graphite conductive film, the deposition time is 60min, and the final film thickness is 5μm, the particle size is 200-300nm, and the conductivity is 0.930×10 5 S / m graphite is subsequently annealed at 400°C for 30 min. Then put it in silicon oil and heat it to 120°C, keep it for 50min at a voltage of 4kV / mm for polarization, and finally drop to room temperature to test the related performance.

[0025] The test results of each performance are shown in Table 2:

[0026] ...

Embodiment 3

[0028] Will be polished and cleaned on both sides (Na 0.517 K 0.446 Li 0.038 )NbO 3 The piezoelectric ceramic disc and graphite target are placed in a vacuum of 2×10 -4 Pa vacuum coating device, heated to 80℃, filled with argon gas to make the pressure reach 2×10 -1 Pa. The arc current is 100A, the distance between the two electrodes is 100mm, the coating speed is 0.3nm / s, and the final film thickness is 1μm, the particle size is 100-200nm, and the conductivity is 0.121×10 6 S / m graphite, then put it in silicone oil and heat it to 120°C, keep it at 4kV / mm voltage for 50min for polarization, cool it down to room temperature, and test the related performance.

[0029] The test results of each performance are shown in Table 3:

[0030] Electrode coating method

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Abstract

The graphite electrode functional ceramic device and its preparation method belong to the field of functional ceramic materials. Currently the functional ceramic electrode materials commonly use noble metal silver which undoubtedly increases the cost of electrical appliances due to the application in the ceramic device. Moreover, silver is easily oxidized and vulcanized in the air, resulting in performance deterioration when using in some harsh environment. Therefore, it is of great significance to find a non-silver electrode material. Graphite is rich in nature, with superior heat resistance, chemical stability, and high conductivity. The invention uses graphite as the functional ceramic electrode material, which reduces the production costs and improves service life. According to test, the graphite coated functional ceramic, comparing with the silver electrode ceramic device, can significantly improve the piezoelectric and dielectric performance and have equal or better performance in other aspects.

Description

Technical field [0001] The invention belongs to the field of functional ceramic materials, and particularly provides a graphite electrode functional ceramic device and a preparation method thereof. Background technique [0002] Functional ceramics have various properties such as electricity, magnetism, light, sound, heat, chemistry, biology, and display various functions and effects through mutual coupling of various properties. They are used in microelectronics, optoelectronics, sensing technology, and underwater acoustics. Engineering, medical instruments, aerospace technology and household appliances have been widely used. The most important property of functional ceramic media is that it can be polarized under the action of an external electric field, that is, the process of separating the positive and negative charges of the particles (atoms, molecules, ions) in the media into dipoles. The ceramics processed by the polarization process show different Kinds of functions and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 张波萍张倩李海涛
Owner UNIV OF SCI & TECH BEIJING
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