Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145826 | International Journal of Hydrogen Energy | 2016 | 9 Pages |
Abstract
In this study, the effect of hydrogen-plasma arc melting (HPAM) on the removal of metallic and gaseous impurities from pure titanium and titanium alloys is briefly reviewed according to the previous results and a newly added experiment. The highest removal degree (RD) of metallic impurities from pure titanium by HPAM with an Ar-20Â vol.% of H2 gas is 84.8%. In the titanium alloys, the RD values of the metallic impurities of the TiNi, TiMo, TiAl, and Ti6Al4V alloys regarding HPAM with an Ar-20Â vol.% of H2 gas are 82.6%, 86.2%, 49.1%, and 76.6%, respectively. The total amount of gaseous impurities such as O, N, C, and H was decreased to 962Â ppm from 2697Â ppm, whereby a high RD value of 64.6% is shown despite the strong affinity of titanium regarding gaseous elements. It is suggested that HPAM exerts a dramatic effect on the removal of metallic impurities from pure titanium and titanium alloys, and it is appropriate for the refining of titanium alloys whereby a significant weight loss needs to be avoided. Thereby, HPAM process can be applied to industrial refining of commercial titanium and titanium alloys.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jung-Min Oh, Ki-Min Roh, Jae-Won Lim,