A METHOD FOR OPERATING ELECTRON BEAM FURNACE AND INTERMEDIATE PRESSURE ELECTRON BEAM FURNACE

In the representative embodiment described in the specification, an electron beam furnace has an evacuation system which maintains the interior of the furnace at a pressure in the range from about 50 microns Hg to 300 microns Hg. The relatively high pressure reduces degassing time from a cold start,...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	HOWARD R, HARKER
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FURNACES FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL HEATING KILNS LIGHTING MECHANICAL ENGINEERING METALLURGY OPEN SINTERING OR LIKE APPARATUS OVENS PERFORMING OPERATIONS POWDER METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS RETORTS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	In the representative embodiment described in the specification, an electron beam furnace has an evacuation system which maintains the interior of the furnace at a pressure in the range from about 50 microns Hg to 300 microns Hg. The relatively high pressure reduces degassing time from a cold start, suppresses volatilization of constituents of metal being refined, and causes volatilized metal to condense in powder form on a condensing screen. A vibrator assists in removing the powder from the condensing screen. The electron beam gun has a series of compartments which are individually evacuated to maintain the pressure in the compartment containing the cathode at a level less than about 1 micron Hg.