Kinetics of reaction of commercial pure titanium and titanium alloys with O2, N2 and H2 (3rd Report)

Abstract

A series of experimental studies was performed on the kinetics of reaction of commercially pure Ti and Ti alloys with the gas phase H2, O2, and N2, and the report 1 and 2 already dealt with the desorption of H2 from commercially pure titanium and titanium alloys.This paper deals with the absorption of H2 by commercially pure titanium and titanium alloys.Sieverts' absorption apparatus modified by Prof. Iwase et al was used in this experiment. Specimens were wires of commercially pure Ti, 0.2% C-Ti alloy, 5% Al-Ti alloy, 2% Al-2% Fe-Ti alloy having 0.3m/m diameter, polished by emeric paper.Solubilities of hydrogen (s) in Ti and Ti alloys subjected to one atmosphere pressure of H2 were measured at elevated temperature (t) and heat of dissolution of hydrogen in Ti metal was calculaded. When these data are compared to those reported by R. M. Barrer and C. Smithell, we find a definite discrepancy and we assure the latter data should be corrected by this report. Discrepaney is as follows. Although the latter said there was no discontinuity in the curve of loge S-104T around the temperature of 620°C, we found the clear discontinuity in these temperature. Range and this resuls are consistent with the Ti-H phase diagram offered by R. I. Jaffee et al.