研究目的
Investigating the microstructure and electrical properties of ZnO-Bi2O3-Yb2O3 based varistor ceramics under various sintering temperatures to understand their performance against nanosecond transients.
研究成果
The study concluded that increasing the sintering temperature reduces the capacitive effect and leakage current while increasing the non-linearity index. However, it also decreases the density and voltage gradient of the varistor. The sample sintered at 1050 °C showed the least delay in transition speed from non-conduction to conduction mode during nanosecond transients, indicating improved performance.
研究不足
The study is limited to the effects of sintering temperature on the microstructure and electrical properties of ZnO-Bi2O3-Yb2O3 based varistor ceramics. The dynamic behavior was studied through simulation, which may not fully capture real-world conditions.
1：Experimental Design and Method Selection:
The varistor samples were prepared using high-grade raw materials and sintered at different temperatures (900 °C, 950 °C, 1000 °C, and 1050 °C) to study their microstructure and electrical properties.
2：Sample Selection and Data Sources:
The samples were labeled as V1, V2, V3, and V4 based on their sintering temperatures.
3：List of Experimental Equipment and Materials:
High-energy ball mill, zirconia balls, acetone, PVA, uniaxial pressing machine, SEM (Tescan-Vega 3), impedance analyzer (Wayne B).
4：Experimental Procedures and Operational Workflow:
The raw materials were milled, dried, calcined, pulverized, granulated, pressed into pellets, sintered, and then analyzed for microstructure and electrical properties.
5：Data Analysis Methods:
The grain sizes were determined using the linear intercept method, and electrical properties were measured using high voltage DC source unit and impedance analyzer.
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