20.500.12556/RUL-173944 Reakcijska kinetika med staljenim aluminijem in orodnim jeklom brez in z različnimi zaščitnimi plastmi diplomsko delo Reaction kinetics between molten aluminium and tool steel without and with various protective layers diploma work Namen diplomskega dela je bil analizirati vpliv različnih zaščitnih plasti na reakcijsko kinetiko med tekočo aluminijevo zlitino Al99,7 in orodnim jeklom za delo v vročem AISI (ang. American Iron and Steel Institute) H11. Interakcijo med jeklom AISI H11 in talino Al99,7 brez in z zaščitnimi plastmi TiAlN+WC/C, TiAlxN in AlCrN smo raziskali s pomočjo diferenčne vrstične kalorimetrije (DSC) pri temperaturi 700 °C. V napravo smo ustavili »sendvič« vzorcev jekla AISI H11 brez in z zaščitnimi plastmi ter zlitine Al99,7. Na ta način smo preučili visokotemperaturno obstojnost zaščitnih plasti v stiku s tekočo aluminijevo talino in njihovo sposobnost preprečevanja difuzije elementov iz jekla v tekoči aluminij. Po izvedeni DSC analizi smo vzorce pripravili na metalografske preiskave, pri čemer smo uporabili svetlobno in elektronsko vrstično mikroskopijo (SEM). Na ta način smo opredelili debeline interakcijskih in zaščitnih plasti ter primerjali učinkovitost zaščitnih plasti pri omejevanju prehoda elementov iz jekla AISI H11 v tekočo zlitino Al99,7. Rezultati opravljenih raziskav so pokazali, da so zaščitne plasti učinkovito ustavile difuzijo elementov in s tem raztapljanje orodnega jekla v talini Al99,7, saj ni bilo zaznati prisotnosti intermetalnega in kompozitnega sloja. Velik vpliv na sposobnost zaščitnega sloja pri preprečevanju reakcij med orodnim jeklom in staljeno aluminijevo zlitino igra med drugim tudi debelina zaščitne plasti ter njena sestava. Iz pridobljenih rezultatov lahko sklepamo, da se je med tremi preiskovanimi zaščitnimi plastmi za najboljšo izkazala dvokomponentna TiAlN+WC/C zaščitna plast. The aim of this thesis was to analyze the influence of different protective coatings on the reaction kinetics between the liquid aluminum alloy Al99.7 and hot-work tool steel AISI H11. The interaction between AISI H11 steel and Al99.7 melt, both without and with protective coatings (TiAlN+WC/C, TiAlxN, and AlCrN), was investigated using differential scanning calorimetry (DSC) at 700 °C. “Sandwich” samples consisting of AISI H11 steel, with and without protective coatings, and Al99.7 alloy were placed into the device. In this way, the high-temperature stability of the protective coatings in contact with molten aluminum alloy and their ability to prevent the diffusion of elements from steel into liquid aluminum was examined. After performing the DSC analysis, the samples were prepared for metallographic examinations using light microscopy and scanning electron microscopy (SEM). This allowed the determination of the thicknesses of interaction and protective layers, as well as a comparison of the effectiveness of the coatings in limiting the transfer of elements from AISI H11 steel into the Al99.7 melt. The results showed that the protective coatings effectively suppressed element diffusion and thus the dissolution of tool steel in the Al99.7 melt, since no intermetallic or composite layers were detected. The thickness and chemical composition of the protective layer were found to have a significant influence on its ability to prevent reactions between tool steel and molten aluminum alloy. Based on the obtained results, the two-component TiAlN+WC/C coating proved to be the most effective among the three protective layers investigated. interakcija tekoči aluminij-jeklo zaščitna plast interakcijske plasti diferenčna vrstična kalorimetrija mikrostruktura. Protective coating aluminium 99 7 tool steel AISI H11 interaction steel-aluminium differential scanning calorimetry scanning electron microscopy. true false false M. Makarovič Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-09-25 09:00:13 2025-09-25 09:00:18 2025-11-15 03:59:37 0000-00-00 00:00:00 2025 0 Ljubljana 0 Ljubljana XII, 41 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 109085 257233667 27211.pdf 27211.pdf 1 E66A44515F136F9E880F403D1E0B6644 07f0aaa64456565bc3d709d36cfafe2f67126ad9df310b8f1599420605199adc 245bc39d-99dd-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=218650 Naravoslovnotehniška fakulteta 0 0 0