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AES study of surface layers in reed switches
Murko-Jezovšek, Melita ...
AES analyses of contact surfaces were provided to find the rate of decomposition of carbon containing gases during electrical loading. Model reed switches were evacuated and then filled with ▫$N_2 + ...H_2, N_2 + H_2 + CO, N_2 + H_2 + CO + CO_2, N_2 + CO + CO_2$▫ and ▫$N_2 + H_2 + C_2H_2$▫ respectively. After the lifetime test the contact resistance of switches filled with ▫$N_2 + H_2, N_2 + H_2 + CO$▫ and ▫$N_2 + H_2 + CO + CO_2$▫ remained relatively low (it increased from 70 to less than 200m▫$\Omega$▫). On the contrary the resistance of switches filled with ▫$N_2 + CO + CO_2$▫ increased to 0,9▫$\Omega$▫ and of switches filled with ▫$N_2 + H_2 + C_2H_2$▫ to 7,4 ▫$\Omega$▫. AES analyses have shown that the quality of carbon deposited on contacts of switches filled with ▫$N_2 + H_2 + C_2H_2$▫ was much greater than that deposited on contacts from switches filled with other gas mixtures without ▫$C_2H_2$▫. The gas chromatographic analysis showed an appreciable lowering of the ▫$C_2H_2$▫ concentration as the consequence of carbon consumption by deposition on the contacts and the formation of ▫$CH_4, C_2H_4$▫ and ▫$C_2H_6$▫. In model reed switches filled with ▫$N_2 + H_2 + CO, N_2 + H_2 + CO + CO_2$▫ and ▫$N_2 + CO + CO_2$▫ the original CO concentration was lowered. The results enabled us to greatly improve the quality of our switches.
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