vacuum fusion


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vacuum fusion

[′vak·yəm ′fyü·zhən]
(metallurgy)
A technique for determining the oxygen, hydrogen, and sometimes nitrogen content of metals; can be applied to a wide variety of metals with the exception of alkali and alkaline earth metals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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For the wrought and extrusion industry, which requires absolute control of the hydrogen level in its melts, other more sophisticated test methods, such as the recirculating gas, First Bubble, subfusion and vacuum fusion extraction methods, have evolved.
The sample is machined and subjected to a vacuum sub-fusion, nitrogen carrier fusion (LECO) or vacuum fusion analysis in the laboratory.
In both subfusion and vacuum fusion, the hydrogen is extracted under vacuum from a rapidly chilled sample which must be chilled fast enough to allow the hydrogen to be entrapped in the solid without surface porosity formation.