An alloy and metal matrix composite (MMC) based on a refractory metal such
as rhenium resists oxidation by the inclusion of alloying substances with
affinity for oxygen or other oxidizing substances. Rhenium enjoys
excellent high temperature strength but oxidizes at a much lower
temperature. This reduces its desirability for hot, stressed environments.
The addition of substances, such as soluble metals, that attract oxygen
may form a protective oxide layer over the remaining portion of the
rhenium-alloy part or piece. Such soluble alloying constituents may
include chromium, cobalt, nickel, titanium, thorium, aluminum, hafnium,
vanadium, silicon, aluminum, and yttrium. The addition of second phase
fiber or particulates such as carbides of silicon, tungsten, titanium
and/or boron provides additional wear resistance in the formation of a
resulting metal matrix composite (MMC).
