The thesis focuses on the production of welding rods from bell bronze using gravity casting. In the initial stage, a plan was prepared, and a model was produced by 3D printing. A single-use mold for the model was made using the CO2 process, with a horizontal parting line. To ensure a smoother flow of molten metal and reduce the likelihood of reactions between the melt and the mold, the mold was coated with a graphite layer.
The casting was carried out from a graphite crucible in an induction furnace, in which we melted the return material serving as the input raw material. From the castings, two samples were prepared – one at the beginning and one at the end of the rod. Four analyses were performed on these samples: simultaneous thermal analysis, X-ray flurescence analysis, as well as observations under an optical and a scanning electron microscope.
In the simples, the δ-phase (Cu31Sn8) was of particular importance, as its presence ensures the desired tones in bells.
|
