Abstract
Molybdenum is finding wide application as constructive material in high temperature furnaces, which are operated under high vacuum or inert/protective gas conditions. Direct contact of Mo with graphite often is inevitable. It is known that high bulk-concentrations of carbon in Mo lead to an embrittlement of the metal. In the paper to be presented, the kinetics of the Mo-carburization in the temperature range of 1250–1550°C were derived and correlated with the decreasing ductility of the material. Enhanced concentrations of nitrogen in Mo and TZM also embrittle the materials. Less known and therefore the topic of this study is the velocity of the nitriding of Mo and TZM in various nitrogen-containing protective atmospheres. The resulting changes of the mechanical and oxidation properties are treated subsequently.
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