테프론의 가열에 의한 C-V 열화 특성에 관한 연구

Abstract

Department of Safety Engineering, Korea National University of Transportation, Chungju 380-702, Korea(Received October 19, 2014; Revised October 24, 2014; Accepted October 24, 2014) Abstract: In this study, the temperature characteristics of electrostatic capacity and dielectric loss for the sample of Teflon film which is degradated at the 120℃∼200℃ temperature range in the oven for 10 hours has been measured in through the applied frequency range of 0.1 kHz∼4,800 kHz at temperature of 50℃, 90℃, 130℃, 170℃. Also, in the same conditions, the frequency characteristics of electrostatic capacity and dielectric loss for the sample of Teflon film has been measured in through the applied temperature range of 30℃∼70℃ on setting frequency of 0.1 kHz, 1 kHz, 10 kHz, 100 kHz. The results of this study are as follows. When the frequency range of 0.1 kHz∼4,800 kHz applied to the sample of Teflon film, the electrostatic capacity has been measured at the temperature of 50℃, 90℃, 130℃, 170℃. Through this measurement, it found that the electrostatic capacity decreased with increasing temperature. Regarding this result, may be it is because the electromagnetic coupling is degraded by thermal degradation. When the sample of Teflon film heated at 280℃ for 10 hours in oven, the dielectric loss has changed from unstable status to stabilizing status with increasing the degradation temperature in the 120℃, 160℃, 200℃ range. In this measurement, the two spectrums of dielectric loss appeared. It considers that this spectrum of dielectric loss appeared in 300 Hz is caused by the molecular motion of the C-F or OH group. Through this study, It found that the electrostatic capacity decreased with increasing frequency and temperature, and there is no change in dielectric loss, although the frequency increases.Keywords: Electrostatic capacity, Dielectric loss frequency and temperature