Molybdenum News Center

In Air TZM Alloy Oxidation and Volatilization

The TZM alloys has excellent high temperature strength and thermal conductivity which provide attractive features for components in advanced magnetic and inertial fusion devices. Refractory metal-base alloys react readily with oxygen and other gases, and TZM alloys are susceptible to losses from highly volatile molybdenum trioxide (MoO3) species. Transport of radioactivity by the volatilization, migration and re-deposition of MoO3 during a potential accident involving a loss of vacuum or inert environment represents a safety issue. The researchers have experimentally measured the oxidation, volatilization and re-deposition of molybdenum from TZM alloy in flowing air between 400°C and 800°C. Calculations using chemical thermodynamic data for vapor pressures over pure MoO3 and a vaporization mass transfer model correlate well with the experimental data between 600°C and 800°C. Partial saturation of (MoO3) gas species accounts for influences of flow rate at 700°C. Some anomalies in oxidation rate below 650°C suggest that other phases, e.g., MoO2 or other non-stoichiometric oxides may influence oxidation and volatilization processes under some limited conditions.

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