Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1987-08-31
1988-06-07
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 844, C22B 3412
Patent
active
047494093
ABSTRACT:
A method of purifying refractory metal, comprising: providing a distillation space, said space comprising both a heatable portion and a condensation portion in communication with each other, and being closed but provided with gas inlet- and gas outlet openings, said degassing opening being located in the condensation portion, placing a mixed deposit of a refractory metal with magnesium metal and magnesium chloride in said heatable portion, heating said deposit under a subatmospheric pressure to temperatures high enough to cause evaporation of magnesium and magnesium chloride, degassing the space through the gas outlet opening, cooling magnesium and magnesium chloride to deposit in the condensation portion, starting introduction of an inert gas, through the gas inlet opening, at a timing where there is a steady, substantially decreased pressure of the thus forming vapor on the order of 10.sup.-2 Torr in the space, keeping supply of the inert gas while degassing through said openings, respectively, so that an increased but still subatmospheric pressure less than 1 Torr is maintained in the space.
REFERENCES:
patent: 3847596 (1974-11-01), Holland et al.
patent: 4441925 (1984-04-01), Ishizuka
patent: 4527778 (1985-07-01), Ishizuka
patent: 4584018 (1986-04-01), Ishizuka
LandOfFree
Method of purifying refractory metal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of purifying refractory metal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of purifying refractory metal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-842718