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Notranja oksidacija srebrovih in bakrovih zlitin z ogljikom = Internal oxidation in silver-carbon and copper-carbon alloys
Čevnik, Gabrijela, 1969- ; Kosec, Ladislav ; Grešovnik, Ferdinand
Zlitine srebra z ogljikom in bakra z ogljikom pri visokih temperaturah na zraku ali v kisiku reagirajo po mehanizmu notranje oksidacije. Ker je topnost ogljika v trdnem srebru in trdnem bakru zelo ...majhna, so te zlitine dvofazne. Analizirali smo kinetiko oksidacije zlitin, določili aktivacijsko energijo in mehanizem notranje oksidacije. Kinetika oksidacije je pri obeh skupinah materialov najbolj odvisna od difuzije kisika in sledi parabolični odvisnosti od časa, ki jo je opisal Wagner. Aktivacijska energija procesa je za material CuC enaka 70,5 kJ/mol in za material AgC je enaka 50,1 kJ/mol, kar je blizu aktivacijski energiji za volumsko difuzijo kisika v trdnem bakru oziroma srebru. Pri oksidaciji zlitine nastajajo plinski produkti. Oksidacija grafita poteka neposredno s kisikom iz trdne raztopine, ko pa se zaradi nastanka plinske faze stik prekine, pa preko plinske zmesi iz CO in CO2.
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