研究目的
To investigate the effects of surface Cr2O3 coating treatment on improving the surface flashover characteristics of ceramic vacuum interfaces under long pulse-duration high voltage.
研究成果
Surface Cr2O3 coating treatment significantly improves the surface flashover performance of ceramic vacuum interfaces by reducing the secondary electron emission coefficient and surface resistivity, leading to a higher hold-off voltage. This method is effective and convenient for applications in high-voltage systems.
研究不足
The study may have limitations in the generalizability to other ceramic materials or different coating methods. The vacuum conditions and specific equipment used could impose constraints, and the small sample size might affect statistical robustness. Potential areas for optimization include exploring other surface treatments or varying experimental parameters.
1：Experimental Design and Method Selection:
The study uses surface treatment with Cr2O3 coating to modify alumina ceramic interfaces, based on the secondary electron emission avalanche (SEEA) theory. Methods include SEM, LSCM, XRD, EDX, AFM, high resistance testing, SEE coefficient measurement, and surface flashover voltage measurements.
2：Sample Selection and Data Sources:
Alumina ceramic (95% in mass) samples are used, divided into untreated (group A) and treated (group B) groups. Samples include disk types (112 mm diameter, 10 mm thickness) and small cylinders (φ10 mm×2 mm). Data is collected from laboratory experiments.
3：List of Experimental Equipment and Materials:
Equipment includes SEM (Quanta 600 FEG), LSCM, XRD, EDX, AFM, high resistance test instrument, electron-gun induced secondary electron emission measuring system, pulse transformer, water dielectric spiral pulse forming line (PFL), spark switch, high-current diode, resistant divider, oscilloscope, turbo molecular pump. Materials include acetone, ethanol, gold for sputtering, Cr2O3 coating.
4：Experimental Procedures and Operational Workflow:
Samples are cleaned in acetone and ethanol. Surface treatment involves applying Cr2O3 coating. Surface properties are measured using SEM, LSCM, XRD, EDX, AFM. Electrical properties (surface resistivity and SEE coefficient) are measured. Flashover voltage is measured by gradually increasing voltage in steps until flashover occurs, with vacuum maintained at specific pressures.
5：Data Analysis Methods:
Data is analyzed by comparing treated and untreated samples, using measurements from instruments and statistical methods for flashover tests (e.g., defining Efb and Eho based on consecutive tests).
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SEM
Quanta 600 FEG
To observe the surface morphology of ceramic samples.
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LSCM
To observe the surface morphology of ceramic samples.
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XRD
To investigate the relationship between surface state and surface flashover characteristics.
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EDX
To analyze the chemical compositions of the ceramics.
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AFM
To measure the topographic properties and surface roughness.
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high resistance test instrument
To measure the surface resistance of ceramics.
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electron-gun induced secondary electron emission measuring system
To measure the SEE coefficient of ceramic specimens.
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pulse transformer
Part of the experimental setup for surface flashover voltage measurements.
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water dielectric spiral pulse forming line
PFL
Part of the experimental setup for generating pulsed high voltage.
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spark switch
Part of the experimental setup for switching high voltage.
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high-current diode
Part of the experimental setup for conducting flashover tests.
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resistant divider
To measure the diode voltage.
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oscilloscope
To record the voltage measurements.
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turbo molecular pump
To maintain vacuum conditions during experiments.
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