20.500.12556/RUL-110450 Ustreznost formarskih materialov za litje aluminijevih zlitin z dodatki litija The suitability of moulding materials for casting aluminium alloys with additions of lithium Namen diplomskega dela je bil določanje ustreznosti formarskih materialov, za litje aluminijevih zlitin z dodatki litija. Ugotoviti smo hoteli, ali so forme narejene po postopku Croning in CO2, ter forme iz kalcijevega silikata, pri katerih so uporabljeni premazi, ki imajo za polnilo grafit, grafit in cirkon, ter aluminat in grafit, primerne za litje omenjenih zlitin. Glede na to, da so znanstveniki že poskušali take zlitine liti v jeklene in grafitne forme, pa smo preizkusili tudi ustreznost teh dveh. Zanimalo nas je, v kakšnem stanju bodo forme po litju, površina ulitkov, ter poroznost ulitkov. Eksperimentalni del je bil začet tako, da je bilo najprej narejeno jekleno orodje za izdelavo celic, katero je bilo nadalje uporabljeno za izdelavo peščenih form, narejenih po postopku Croning in CO2. Forme iz kalcijevega silikata so bile izrezane iz silikatne opeke, za grafitno in jekleno formo pa je bila uporabljena že obstoječa, narejena forma. Rezultati so pokazali, da litje v peščene forme in forme iz kalcijevega silikata, kljub uporabi premazov ne prinaša željene kvalitete ulitkov. Pri uporabi teh form so bili vzorci močno porozni, po površini pa je nastajala plast litijevega oksida. Ulitke s kvalitetno površino in manj porozne ulitke, pa daje litje v jeklene in grafitne forme. The purpose of the diploma work was to determine the suitability of moulding materials for casting aluminum alloys with lithium additions. We wanted to find out whether the moulds were made using the Croning and CO2 process and calcium silicate forms, in which coatings that have a graphite, graphite and zircon, and aluminate and graphite filler are suitable for the casting of said alloys. Considering that scientists have already tried to cast such alloys into steel and graphite forms, we also tested the suitability of these two. We were interested in the state of the molds after casting, the surface of the castings, and the porosity of castings. The experimental work was initiated in such a way that a steel cell tool was first made, which was further used for the production of sandy forms made using the Croning and CO2 process. Forms of calcium silicate were cut out of silicate bricks, and pre-existing forms were used for graphite and steel form. The results showed that casting in sandy forms and forms of calcium silicate, despite the use of coatings, does not produce the desired quality of castings. When using these forms, the samples were highly porous and a layer of lithium oxide was formed on the surface. Looking at cooling curves, a lot of reactions take place in the cooling of these alloys. Castings with good surface and less porous castings give casting to steel and graphite forms. litje aluminijevih zlitin z dodatki litija formarski materiali reakcije taline s formo reakcije litija v aluminijevi talini casting of aluminum alloys with lithium additives forming materials melt reaction with form reaction of lithium in aluminum melt true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2019-09-15 07:15:08 2019-09-15 07:15:13 2022-08-22 03:43:49 0000-00-00 00:00:00 2019 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 69982 1838943 4361.pdf 4361.pdf 1 E756180C9AB23E26C8DC8DD81529F839 0fd033c7df8021cf6785a267d86d01bd27d20fbeca8d0d3c29a102b0a71d94e0 1f262f57-a1b7-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=122115 Naravoslovnotehniška fakulteta 0 0 0