Method of evaporating melts of alloys of metals having different vapor pressures

US4230739A · kind A · utility

Assignee

• Leybold-Heraeus GmbH · DE

Inventors

• Hans Aichert · Hanau, DE
• Walter Dietrich · Yorktown Heights, US
• Alfred Hauff · Bruchköbel, DE
• Peter Sommerkamp
• Herbert Stephan · Bruchköbel, DE

Key dates

• Filing date: Nov 22, 1978
• Grant date: Oct 28, 1980
• Expiry date: Nov 22, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C14/30
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Method for evaporating melts of alloys of metals of different vapor pressures from continuously fed, large-area evaporating crucibles by direct bombardment of the bath surface with focused electron beams which are periodically deflected according to a pattern. The alloy material is deposited on a plurality of substrates such as turbine blades which are positioned in a field above the evaporating crucible with local adaptation of the energy density to the thermal economy of the melt bath. At least one electron beam is deflected onto at least two substantially rectangular beam fields and is guided in each of these fields through a line raster at a frequency of at least 100 Hz while shifting periodically from one to the other field with a shift frequency of at most 5 Hz.