Purity evaluation of Ta metal refined by Ar/Ar-H2 plasma arc melting

Jae Won Lim, Good Sun Choi, Kouji Mimura, Minoru Isshiki

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


The refining effect of Ar/Ar-H2 plasma arc melting (PAM) was investigated and the purity of Ta metals was evaluated by glow discharge mass spectrometry (GDMS). Most impurities in the Ta metals were removed by Ar/Ar-H2 PAM, down to a few mass ppm levels, and the purities of respective Ta metals refined by Ar/ Ar-20 % PAM were improved up to 5N5 (99.9995 %) and 5N7 (99.99972 %). It was also found that the deoxidation reaction under hydrogen plasma condition is enhanced by a remarkable decrease in the oxygen concentration of the Ta metal refined by Ar-H2 PAM.

Original languageEnglish
Pages (from-to)539-543
Number of pages5
JournalMetals and Materials International
Issue number4
Publication statusPublished - 2008 Aug
Externally publishedYes


  • Glow discharge mass spectrometry
  • Hydrogen
  • Impurity
  • Plasma arc melting
  • Tantalum

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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