Graphite paper and barium titanate ceramic film capacitor and preparation method thereof
A technology of ceramic thin film and barium titanate, which is applied in the field of graphite paper-barium titanate ceramic thin film capacitors and their preparation, can solve the problems of low capacitance of thin film dielectric constant capacitors, difficulty in meeting the requirements of large-capacity capacitors, expensive metal electrode materials, etc. problem, to achieve the effect of simple production method, easy processing and low price
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Embodiment 1
[0032]A single-layer dielectric layer was selected, and the mass ratio of barium titanate powder, anhydrous ethanol, and zirconia balls was 1:1:1.25, and the ball milled in a star ball mill at a speed of 400 r / min for 10 h, and the pulling speed was 4 cm. / min to form a film, press 36MPa to form, and then under vacuum conditions, pressurize 3.6MPa throughout the process, heat up to 900°C for 15min at a heating rate of 30°C / min, then rise to 1200°C for sintering for 0.5h, and cool naturally After that, the capacitor was obtained by processing in a muffle furnace at 450°C for 6 hours. The thickness of the obtained barium titanate ceramic dielectric layer is 20 μm, and the area of the inner electrode is 2.25 cm 2 The electrochemical properties of the ceramic film capacitors were tested under the EIS test system.
[0033] The test frequency is 100Hz. After testing, the capacitor has a capacitance value of 56.4nF, a dielectric constant of 566 and a dielectric loss of 2.68 under ...
Embodiment 2
[0035] Select a three-layer dielectric layer, use barium titanate powder, anhydrous ethanol, and zirconia balls with a mass ratio of 1:1:1.25, in a star-shaped ball mill at a speed of 400 r / min for 10h, and the pulling speed is 2cm / min to form a film, press 36MPa to form, and then under vacuum conditions, pressurize 3.6MPa throughout the process, heat up to 900°C for 15min at a heating rate of 30°C / min, then rise to 1200°C for sintering for 0.5h, and cool naturally After that, the capacitor was obtained by processing in a muffle furnace at 450°C for 6 hours. The thickness of the barium titanate ceramic dielectric layer is 12 μm, and the internal electrode area is 2.25 cm 2 The electrochemical properties of the ceramic film capacitors were tested under the EIS test system.
[0036] The test frequency is 100Hz. After testing, the capacitance value of the capacitor reaches 196nF under the 1V test voltage, the dielectric constant reaches 525, and the dielectric loss is 2.79; und...
Embodiment 3
[0038] To select a capacitor with a single-layer dielectric layer and an alumina layer, firstly, the alumina powder, anhydrous ethanol, and zirconia balls were ball-milled at a speed of 500 r / min for 8 hours at a mass ratio of 1:1:1. The alumina dispersion liquid was prepared, and the mass ratio of barium titanate powder, anhydrous ethanol, and zirconia balls was 1:1:1.25, and the barium titanate dispersion liquid was prepared by ball milling in a star ball mill at a speed of 400 r / min for 10 hours. The graphite paper electrode was pulled to form a film in an alumina dispersion at a pulling speed of 4 cm / min, dried and then pulled into a film at the same pulling speed in a barium titanate dispersion, pressured at 36 MPa to form a film, and then placed in a barium titanate dispersion to form a film. Under the condition of 3.6 MPa in the whole process, the temperature was raised to 900 °C for 15 min at a heating rate of 30 °C / min, and then raised to 1200 °C for sintering for 0.5 ...
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