Download Elektrische Kontakte / Electric Contacts Handbook by Dr. phil. Ragnar Holm (auth.) PDF

By Dr. phil. Ragnar Holm (auth.)

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Extra resources for Elektrische Kontakte / Electric Contacts Handbook

Example text

Private communication to the author. The fact that the contamination layer did not rupture is seen at the contact conductance being proportional to the contact area between the mercury and the submerged rod. 3 Of. § 26 C. 1 2 § 8. The contact surface as a function of load, elastic and plastic properties 33 Among the results of the observations we mention: On metal surfaces that had been cut while submerged in mercury, no transition resistance was measured. After exposing steel and molybdenum to air (normal humidity) during one minute KLAUDY observed (J "'" 2 .

H a guess is allowed, one would think that it is the adsorbed oxygen layer, mentioned above, that is bound by VAN DER WAALS forces on the outside of the chemisorbed oxygen layer. 2 ev is so much feebler than the chemisorption bond, or any bond between the -atoms in the metal lattice, that this layer is doomed to break down mechanically before anything else in the contact is affected'. R. HOLM and collab. [13] p. 53 to 55, also KAPPLER [1]. R. HOLM, for instance in [7] p. 234. 3 A. MEYER [1]; BOWDEN and TABOR [3]; COOKS [1].

Silver contact, Ab = A. 5 138 138 observed time calculated time observed time calculated time - - to 200 °0. 06). § 9. 13) presents an application of Eq. (1,2). Three crossed silverrod contacts were investigated under a contact load of 35 kg at the temperatures T = 473, 438 and 403 oK. One observed a continuous yielding of the contacts which finally ceased. This is explanable by atomic diffusion. -f)), which adapts the values to the definition of comparable states of the contact members. At the low temperatures applied, the contact resistance, and thus the hardness changed only little immediately after contact make.

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