Hydrogen effect on refining of Mo metal by Ar-H2 plasma arc melting

Jae Won Lim, Kouji Mimura, Dai Miyawaki, Jung Min Oh, Good Sun Choi, Sang Bae Kim, Masahito Uchikoshi, Minoru Isshiki

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The refining effect of Ar/Ar-H2 plasma arc melting (PAM) was investigated and the purity of Mo metals was evaluated by glow discharge mass spectrometry (GDMS). Most impurities in the Mo metals except for W were removed by Ar/Ar-H2 PAM down to a few mass ppm levels, and the purities of respective Mo metals refined by Ar/Ar-20%H2 PAM were improved up to 4N(99.9943%) and 5N(99.9996%). It is also found that Ar-H2 PAM provides excellent decarburization, deoxidation, and denitrogenization. This confirmed that the refining effect is chemically induced by activated hydrogen atoms during Ar-H2 PAM.

Original languageEnglish
Pages (from-to)2290-2292
Number of pages3
JournalMaterials Letters
Issue number21
Publication statusPublished - 2010 Nov 15


  • Glow discharge mass spectrometry
  • Hydrogen plasma arc melting
  • Impurity
  • Metallurgy
  • Metals and alloys
  • Molybdenum


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