Thermodynamic simulation of systems with refractory metals melted by Ar-H2 plasma

D. Elanski, K. Mimura, M. Isshiki

Research output: Contribution to journalArticlepeer-review

Abstract

Thermodynamic calculations were carried out to simulate impurity removal from refractory metals by Ar-H2 plasma arc melting. The calculations enable us to estimate the impurity removal degree. Numerical agreement between the experimental and calculated results for the base metals Ti, V, Zr, Nb to Ta improve in that order. Addition of H2 to the plasma gas results in faster transfer of the system toward equilibrium-like state, while the equilibrium composition of the metal does not depend on the plasma gas, but on temperature. The examined impurities transfer to the gas phase in the form of atoms while hydride formation makes a minor contribution; thus, the major factor for better metal purification with Ar-H2 plasma is considered to be an increase in the molten-metal temperature.

Original languageEnglish
Pages (from-to)849-852
Number of pages4
JournalVacuum
Volume47
Issue number6-8
DOIs
Publication statusPublished - 1996

Keywords

  • Hydrogen plasma
  • Plasma arc melting
  • Refining
  • Refractory metals
  • Thermodynamic simulation

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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