Specific areas of copper alloys application

U ovom diplomskom radu obrađena je tema pod nazivom „Specifična područja primjene legura bakra“. U teorijskom dijelu rada općenito su opisani bakar i njegve legure – bronce i mjedi. Prikazani su kemijski sastavi legura, dijagrami stanja, poneka fizikalna i mehanička svojstva i primjena u praksi. Posebna pažnja pridodata je berilijevoj bronci, koja je u pravilu niskolegirani bakar (sadrži oko 2 %Be), ali se zboj svoje važnosti i specifičnog područja primjene ubraja u legure bakra. U eksperimentalnom dijelu rada kao problem se nameće odabri dodatnog materijala prir reparaturnom navarivanju segmenta kalupa (usnika) koji je napravljen upravo od berilijeve bronce. Napravljena su 3 uzorka te je na svaki od njih navaren sloj od različitog dodatnog materijala. Pošto se radi o dijelu kalupa za ulijevanje aluminija, brončani segment izložen je erozijskom trošenju, te se za dodatni materijal odabire onaj koji pokaže najbolje rezultate nakon ispitivanja tvrdoće. Zaključeno je da će se kao dodatni materijal pri navarivanju usnika koristiti dodatni materijal koji se koristio kod uzoraka GC03 ili GC01. Pri izboru dodatnog materijala za navarivanje će se osim tvrdoće u obzir uzeti i cijena tog dodatnog materijala kao i njegovo ponašanje pri zavarivanju.In this master thesis, a topic entitled "Specific areas of application of copper alloys" is processed. In the theoretical part of the paper, copper and its alloys - bronze and brass - are generally described. The chemical compositions of alloys, phase diagrams, some physical and mechanical properties and applications are presented. Special attention is paid to beryllium bronze, which is actually low-alloyed copper (contains about 2% Be), but due to its importance and specific areas of application is considered to be copper alloy. In the experimental part of the paper, the problem is the selection of additional material for the repair welding of a segment of the mold which is made of beryllium bronze. 3 specimens were made and a layer of different additional material was welded on each of them. As it is a part of a mold for casting aluminum, the bronze segment is exposed to erosion wear, and for the additional material is selected the one that shows the best results after the hardness test. It was concluded that the additional material used in specimens GC03 or GC01 would be used as an additional material when welding the bronze segment. When choosing an additional material for welding, in addition to hardness, the price of additional material as well as its welding behavior will be taken into account