Evaporation Technique for Highly Refractory Substances
Author:
- 1 March 1934
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 5 (3) , 125-126
Abstract
Platinum, boron, molybdenum, quartz and other substances have been evaporated in vacuum from a crucible heated by bombardment with electrons at 4000 volts from a tungsten filament. A small pure graphite crucible was heated to its melting point about 3500°C by 100 milliamperes of electron current. Most elements will alloy with a tantalum or molybdenum crucible so a graphite cup is usually preferable. Low melting point substances which would easily alloy with a tungsten filament can be readily handled by this method, which has been used in the preparation of x‐ray target surfaces, small mirrors and absorbing films.Keywords
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