挿発ガス雰囲気中で動作するリレー接点の接触抵抗特性に関する実験的検討

摘要

Influences of vapors evaporated from an acryl-based non-silicone-type polymeric cured product and conventional silicone-containing polymeric cured products were evaluated with respect to their effects on contact resistance characteristics of relay contacts at ambient temperature of 120°C. More specifically, a commercially-available mechanical relay (AgSnln contacts) was sealed into a metal can with one of these products, and placed in a heating chamber to operate, at an operating frequency of 0.5 Hz, 40,000 break operations of an inductive DC 14V-1A, 14V-0.4A, 10V-1A, 5V-1A load currents, or a resistive DC 14V-1A load current. Contact resistance values were measured at every 50 operations. As a result, the relays sealed with the acryl-based non-silicone-type polymeric cured product showed no deterioration in contact resistances, irrespective of the load conditions. On the other hand, the relays sealed with the silicone-containing polymeric cured products showed more significant deteriorations and fluctuations of the contact resistance characteristics, and certain influences of load conditions on their behaviors were recognized.%シリコーンを含有しないアクリル系ポリマー材料、ならびに従来のシリコーン系ポリマー材料からの揮発ガス成分がリレー接点の接触抵抗特性に与える影響に関する検討の一環として、120℃環境下で、直流誘導性負荷回路（L＝20m H）における14V－1A、14V－0．4A、10V－1A、5V－1A、及び直流抵抗性負荷回路における14V－1Aの連続4万回遮断試験を動作周期0．5Hzで行って50回動作毎の接触抵抗を測定し、電気的負荷条件の相違が接触抵抗特性に与える影響を検討した。アクリル系ポリマー材料では、電気的負荷条件にかかわらず安定した接触抵抗特性が得られた。一方、シリコーン系材料では、いずれの負荷条件でも接触抵抗特性の変動や悪化が観察され、負荷条件の相違による傾向の違いも認められた。