20.500.12556/RUL-179044 Razvoj naprednega ultrazvočnega spajanja električnih komponent Development of advanced ultrasonic joining of electrical components Disertacija obravnava izboljšave električnih spojev tankih bakrenih žic, izdelanih z ultrazvočnim varjenjem in spajkanjem. Zaradi slabše mehanske trdnosti tankih žic pri klasičnem ultrazvočnem varjenju je bil razvit pristop z varjenjem z obročem, ki zmanjša deformacije žic. Preučeni so bili vplivi varilnih parametrov (energija, tlak, amplituda) in določeni optimalni pogoji za lakirane in nelakirane žice. Spoji lakiranih žic so kljub nekoliko slabši prevodnosti in mehanski trdnosti izkazali boljši energetsko učinkovitejši postopek. Toplotni šok v območju -30 do 150 $°$C ni bistveno vplival na mehanske ali električne lastnosti spojev. V nadaljevanju je raziskana uporaba ultrazvočnega varjenja za tesnjenje hladilnih kanalov v bakrenih kladah iz Cu-ETP kot alternativa konvencionalnim postopkom. Razvita metoda omogoča zanesljivo mehansko in hermetično spajanje brez dodatnih materialov, kar povečuje robustnost in trajnost spojev. Zaključno poglavje obravnava korozijsko zaščito galvansko spojenih sistemov iz aluminijeve zlitine AA6082 in bakra (Cu-ETP) v kloridnem okolju. Sinergetski učinek mešanice cerijevega acetata, natrijevega sulfata in 1H-benzotriazola znatno zmanjša galvansko korozijo, poveča stabilnost pasivnih filmov in izboljša dolgoročno odpornost materialov v agresivnih pogojih. The dissertation addresses improvements in electrical joints made of thin copper wires, produced by ultrasonic welding and soldering. Due to the limited mechanical strength of thin wires in conventional ultrasonic welding, a novel ring-welding approach was developed to reduce wire deformation. The influence of welding parameters (energy, pressure, amplitude) was examined, and optimal conditions were determined for both varnished and bare wires. Despite slightly lower electrical conductivity and mechanical strength, joints made with varnished wires demonstrated higher process energy efficiency. Thermal shock testing in the range of −30 to 150 $°$C showed no significant impact on the mechanical or electrical properties of the joints. Furthermore, the study explores the use of ultrasonic welding for sealing cooling channels in Cu-ETP copper blocks as an alternative to conventional sealing methods. The developed technique enables reliable mechanical and hermetic bonding without additional materials, enhancing the durability and robustness of the joints. The final part of the dissertation focuses on corrosion protection of galvanically coupled systems composed of AA6082 aluminium alloy and Cu-ETP copper in a chloride environment. A synergistic combination of cerium acetate, sodium sulfate, and 1H-benzotriazole significantly reduces galvanic corrosion, improves passive film stability, and enhances the long-term corrosion resistance of materials under aggressive conditions. ultrazvočno varjenje tanke bakrene žice tesnjenje hladilnih kanalov korozija galvanski členi AA6082 Cu-ETP ultrasonic welding thin copper wires sealing of cooling channels corrosion galvanic couplings AA6082 Cu-ETP true false false [A. Logar] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2026-02-04 08:30:27 2026-02-04 08:30:33 2026-02-12 04:35:07 0000-00-00 00:00:00 2026 0 0 XXX, 168 str. 2026 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.1:691.73:621.352(043.3) 283147 267276803 46474.pdf 46474.pdf 1 C3011C5699CFE10BD89F64149520CC4C 7ccd2e60949926e740e0c3f5f91a7e696d400b81e2a5b2735a54114b0b8f4f8a 4f66785b-019b-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=227144 Fakulteta za strojništvo 0 0 0