Ispitivanje mikrostrukture, tvrdoće i termijskih karakteristika legura u sistemu Sn-Bi Naučni rad
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Zbog velike toksičnosti olova, bezolovni lemovi postali su glavni fokus elektronske industrije poslednjih godina. Zbog svojih povoljnih svojstava i niske cene, legure iz sistema Sn-Bi predstavljaju potencijalnu zamenu za legure Sn-Pb u lemljenju. Jedna od glavnih prednosti legura iz sistema Sn-Bi su niske temperature topljenja. Legure iz ovog sistema su takođe veoma atraktivne zbog dobre kompatibilnosti sa podlogama, niske temperature procesa, visoke pouzdanosti i potencijalne primene u vidu materijala termičkog sučelja. U ovom radu je urađena karakterizacija mikrostrukturnih i termijskih karakteristika, kao i merenje tvrdoće sedam Sn-Bi legura različitog sastava. Strukturna svojstva uzoraka analizirana su optičkom mikroskopijom i skenirajućom elektronskom mikroskopijom sa energetski disperzivnom spektrometrijom (SEM-EDS). Toplotna provodljivost uzoraka je ispitivana ksenon-fleš metodom (engl. xenon-flash method), a temperature faznih transformacija merene su diferencijalnom skenirajučom kalorimetrijom (engl. differential scanning calorimetry, DSC).
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