Ni-based superalloys, which have been used in aerospace and power-generation gas-turbine engines operating at high temperatures, are serving near their melting point. There is a drive to increase turbine inlet temperatures to increase overall efficiency, but the currently commercially used materials have reached their limits. With a higher melting temperature, and favorable mechanical, creep, and oxidation properties, Mo-Si-based superalloys are of interest as a new family of high-temperature materials to replace Ni-based alloys. By means of in situ environmental transmission electron microscope, the transient period of the early oxidation of Mo3Si was investigated at the nanometer scale. As a result of a competition between loss of volatile MoO3 and association of SiO2 molecular units into pillars, a nanometer-sized porous SiO2 grows at a very initial stage of the oxidation of Mo3Si.
- In situ environmental transmission electron microscope (ETEM)
- Mo-Si-based superalloy
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Science(all)