15 KB160 KB13 KB199219991999Bizjak, MartinKoller, LidijaPožun, Karolštevilka:1/2letnik:33str. 155-159ISSN:1318-0010COBISSID:142506URN:URN:NBN:SI:doc-A28WHGDXslInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijekontaktna upornostkontaktni materialipolimerirelejivakuumsko razplinjevanjeVpliv vakuumskega razplinjevanja polimerov na kontaktno upornost Ag kontaktov v hermetičnih relejih| Influence of the vacuum outgassing of polymers on the contact resistance of Ag contacts in hermetic relays|The purpose of our study is to increase the reliability of electric contacts of AgNi015 alloy which would apparently substitute more expensive contact materials on the basis of gold. Contact reliability strongly depends on the time stability of the contact resistance. Vapour released from the polymer relay parts condenses on the contacts as compact films that incrase the contact resistance. Relay parts made of four different materials (Crastin, Lexan, Ultramide, Araldite) were otugassed in high vacuum (?$1x10^{-6} mbar$?) at 135°C for 48 hours. Then the parts were incorporated into the relays and the contact resistance was measured in definite time intervals. The same was done also with the polymer parts that were not outgassed. We found out that the contact resistance directly depends on the outgassing rate of the material which determines the state of the contact surfaceČasovna stabilnost kontaktne upornosti določa kontaktno zanesljivost. Namen raziskave je bil povečati kontaktno zanesljivost kontaktov iz zlitine AgNi015, kar naj bi nadomestilo draga kontaktna gradiva na osnovi zlata. Zaradi adhezije hlapov iz polimernih relejskih sestavnih delov, ki kondenzirajo na kontaktih v obliki kompaktnih plasti, se s časom močno povečuje kontaktna upornost. V visokem vakuumu ?$(1x10^{-6$?}mbar) pri temperaturi 135°C smo 48 ur razplinjevali relejske sestavne dele štirih različnih materialov (crastrin, lexan, ultramid, araldit). Vgradili smo jih v releje in v različnih časovnih presledkih merili kontaktno upornost. Enako smo naredili tudi z releji, katerih polimernih sestavnih delov nismo razplinjevali. Ugotovili smo, da je kontaktna upornost neposredno odvisna od stopnje razplinjenja materialov. Le-ta torej natančno ovrednoti stanje kontaktne površineNadaljuje se kot: Materiali in tehnologijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije