A Study on the Properties of Epoxy used for Sensor due to Variation of Fabrication Conditions

센서용 에폭시 수지의 제조조건 변화에 따른 특성

The Breakdown properties of epoxy composites are used for transformers and sensor, which has been studied. As a result, From the measurements of breakdown voltage, the more hardener is increased the stronger breakdown strength at low temperature because the ester of hardener is increased. Breakdown strength at the high temperature is decreased because the temperature at $110^{\circ}C$ is near at $T_g$. When the filler is added, between epoxy and silica is formed interface. Therefore the charge is accumulated in it, and the electric field is concentrated, and breakdown strength is decreased than non-filled specimens. In the case of specimens, the treated with silane, the breakdown strength becomes much higher since this is suggested that silane coupling agent has been improved chemical bonding in the interfaces and has been relaxed the electric filed concentration.