Jérôme Barraqué
Jobin Yvon S.A.S., 16-18 rue du Canal, 91 165 Longjumeau, France
Keywords: hydrogen analysis, steel, metals, fusion, extraction, diffusion
1. ITRODUCTION
The JY HORIBA EMGA 621W Hydrogen analyzer
has been designed for accurate measurements of
hydrogen content in different sample types such
as ferrous metals, non-ferrous metals, semiconductors or electronic materials. The hydrogen
content is extracted by fusion of the sample in
inert gas and analyzed by a high sensitivity thermal conductivity detector. It is also possible to
avoid fusion and extract hydrogen content in the
sample by heating below the melting point. The
purpose of this note is to explain when to use
fusion or solid extraction, the benefits, the applications and samples.
2. Principle of the EMGA 621W
The sample is placed in a graphite crucible. The
crucible is maintained between the higher and
the lower electrode of the impulse furnace. A
high current passes through the crucible creating
an increase of the temperature. The gas generated in the furnace is analyzed by the thermal conductivity detector after dust and moistur
