Abstract
In this study, ZnO varistors with different particle sizes were added into the epoxy resin to fabricate ZnO varistor-Epoxy composites. The effect of ZnO filler size on the dynamic mechanical, thermal, and dielectric properties of ZnO varistor-Epoxy composites was investigated. As the temperature ranges from − 60 to 110 °C, 20 vol% ZnO varistor-Epoxy composites with different ZnO particle sizes represent the glassy state, the glass transition state and rubbery state. When ZnO particle size increases from 70 to 255 μm, the storage modulus of ZnO varistor-Epoxy composites is significantly improved from 1681 MPa to 2755 MPa at room temperature, and the maximum value of damping factor fluctuates between 0.55 and 0.60. As the frequency increases from 0.1 to 20 Hz, both the storage modulus and the maximum value of damping factor are raised. In addition, the coefficient of thermal expansion decreases from 5.06 × 10− 5 K− 1 to 4.45 × 10− 5 K− 1, whereas the filler size has little influence on the glass transition temperature of composites. Besides, both the dielectric constant and dielectric loss in the frequency range from 103 to 106 Hz vary in a small range with the increase of the ZnO filler size. With the increase of frequency, both the dielectric constant and dielectric loss gradually decrease. However, as the temperature increases, the dielectric constant and dielectric loss show an opposite trend.
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Data that support the findings of this study are available from the corresponding author [Heng Tian], upon reasonable request.
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Acknowledgments
This work was supported by the Key Scientific Research Projects of Henan Colleges and Universities (Grant No. 20B430005 and Grant No. 21A510004), the Doctoral Fund Project of Henan Polytechnic University (Grant No. B2020-45 and Grant No. B2019-20), the Fundamental Research Funds for the Universities of Henan Province (Grant No. NSFRF210451), the Henan Province Scientific and Technological Project (Grant No. 222102230026).
Funding
This work was supported by the Key Scientific Research Projects of Henan Colleges and Universities (Grant No. 20B430005 and Grant No. 21A510004), the Doctoral Fund Project of Henan Polytechnic University (Grant No. B2020-45 and Grant No. B2019-20), the Fundamental Research Funds for the Universities of Henan Province (Grant No. NSFRF210451), the Henan Province Scientific and Technological Project (Grant No. 222102230026).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by HT, JT, and YF. The first draft of the manuscript was written by JT and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Tian, H., Wu, Y., Tian, J. et al. The effect of ZnO particle size on the dynamic mechanical, thermal, and dielectric properties of ZnO varistor-Epoxy composites. J Mater Sci: Mater Electron 33, 22388–22399 (2022). https://doi.org/10.1007/s10854-022-09016-9
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DOI: https://doi.org/10.1007/s10854-022-09016-9