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This paper investigates the effect of nano-scale SiO2 on the tracking failure properties of nanocomposites. Test samples were made by dispersing nano-scale SiO2 powder in epoxy with the weight ratios of 0, 1, 3, 5, 7, 9 wt%. AC voltage was applied on a pair of needle-plate electrodes at the surface with the insulation distance of 10 mm. The time to tracking failure and discharge current were recorded...
The effect of gamma-ray irradiation on dielectric breakdown of polyphenylene oxide under magnetic field was investigated. The experiment was carried out by applying a dc pulse voltage under magnetic field. The magnetic flux density (MFD) of the magnetic filed was 495 mT. The samples were irradiated in air up to 100 kGy and then up to 1000 kGy with a dose rate of 10 kGy/h by using a 60Co gamma-source...
This paper describes experimental study on degradation mechanism of an epoxy-based composite sheet for printed circuit in control unit of inverter-fed motors subjected to repetitive polarity-reversed voltage pulses. The polarity-reversed voltage pulses after a dc prestress are produced by direct grounding of a charged coaxial-cable. Measurements of pressure wave due to partial discharge at the polarity...
Polarities of plasma charging damage in n- and p-channel MOSFETs with Hf-based high-k gate stack (HfAlOx/SiO2) were studied for two different plasma sources (Ar-and Cl-based gas mixtures), and found to depend on plasma conditions, in contrast to those with conventional SiO2. For Ar-plasma, which was confirmed to induce a larger charging damage, both n- and p-ch MOSFETs with high-k gate stacks suffer...
In general, printed circuit boards (PCBs) used in power devices and system operation in low pressure environments are more susceptible to damage from surface discharges. Additionally, repetitive operation of power systems is an important factor leading to tracking failure. Whether the tracking phenomenon at low pressures is different from that at atmospheric pressure needs better understanding to...
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