VERFAHREN UND VORRICHTUNG ZUR VERMEIDUNG DER VERDAMPFVERLUSTE VON LEGIERUNGSELEMENTEN BEIM ELEKTRONENSTRAHLSCHMELZEN

• Main Authors: STUMPP, HERMANN., 8756 KAHL, DE, BRUECKMANN, GERHARD., 6334 ASSLAR, DE, RANKE, HORST., 8755 ALZENAU, DE, SCHOLZ, HARALD, 6458 RODENBACH, DE, CHOUDHURY, ALOK., 6625 PUETTLINGEN, DE, DIETRICH, WALTER., 6450 HANAU, DE, STEPHAN, HERBERT., 6454 BRUCHKOEBEL, DE
• Format: Patent
• Language: German
• Published: 22.02.1990
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

In the process and apparatus for preventing evaporation loss of alloying elements in electron beam melting, a water- cooled copper trough 10 having a run-out lip 11 is disposed in a vacuum melting chamber 2 in the effective range of a first electron gun 5. A mechanical barrier 14 in the immediate vicinity of the run-out lip holds back a slag layer 16 covering the melting charge 15 and the run-out lip 11 guides the overflowing melt 15 into an ingot mould 12 disposed in the effective range of a second electron gun 6 which keeps the melt 18 in the ingot mould 12 in a molten state. The melt 18 in the ingot mould 12 is itself covered with a further slag layer 20, which, like the slag layer 16 on the melting charge 15, is composed of one or more oxides, e.g. CaO, Al2O3, MgO, TiO2, or ZrO2.