Effects of organic gas components on contact resistance

Effects of organic gas components on the contact resistance have been evaluated. 1,4-butanediol, n-hexane, phenol and benzene are selected in terms of combination of hydroxyl groups (polar group) and a benzene ring (/spl pi/-bond). Effects of these organic gas components on the contact resistance are evaluated by using telecommunication relays whose cases are removed as detectors. Test conditions are as follows: Contact material: Au 90%-Ag 10%. Load condition of electrical life test: 28 V DC, 100 mA. Load condition of mechanical life test: 0 V, 0 mA. Number of operations: 2,500,000 times. Temperature: 85/spl deg/C. The electrical lives are as follows: 1,4-butanediol: 2,500,000 times. N-hexane: 30,000 times. Phenol: 2000 times. Benzene: 6,000 times. The electrical life is effected by a benzene ring (/spl pi/-bond). This effect becomes larger under the existence of hydroxyl groups (polar group). The mechanical lives are as follows: 1,4-butanediol: 3,500,000 times. N-hexane: 1,600,000 times. Phenol: 2,500,000 times. Benzene: 1,400,000 times. The mechanical life depends on hydroxyl groups (polar group). The mechanical life doesn´t depend on a benzene ring (/spl pi/-bond).