M. Serratos et A. Bronson, THE EFFECT OF OXYGEN PARTIAL-PRESSURE ON THE STABILITY OF MAGNELI PHASES IN HIGH-TEMPERATURE CORROSIVE WEAR, Wear, 198(1-2), 1996, pp. 267-270
Titanium carbide with the presence of the Magneli phases has been cons
idered for corrosive wear at temperatures greater then 1000 K. To inve
stigate the effects of the Magneli phases (or non-stoichiometric titan
ium oxides, TinO2n-1) on the wear behavior of TiC or titanium oxides,
experiments must be performed under known oxygen partial pressures und
er which the non-stoichiometric compounds are stable in a vacuum or fl
owing system. The Ti-O-C stability diagram, which clearly shows the ox
ygen partial pressure dependence of the Magneli phases in high tempera
ture investigations, has been developed for the temperature of 1673 K
from the thermodynamic data available for the titanium oxides and TiC.
The gaseous atmospheres needed for stabilizing the Magneli phases dur
ing material processing and in experimental wear research are briefly
discussed.