Mo–Si–B alloys for ultra-high-temperature space and ground applications: liquid-assisted fabrication under various temperature and time conditions

Boron-doped molybdenum silicides have been already recognized as attractive candidates for space and ground ultra-high-temperature applications far beyond limits of state-of-the-art nickel-based superalloys. In this work, we are exploring a new method fabricating Mo–Si–B alloys (as coatings or small bulk components) by utilizing pressure-less reactive melt infiltration approach. The basic assumption approach is synthesis binary and/or ternary complex intermetallic phases (silicides, borides, borosilicides), through direct interaction Si–B with molybdenum. main purpose work was to examine the effect temperature time on structure morphology formed reaction products. For purpose, sessile drop experiments were carried out eutectic Si–3.2B (wt%) alloy/Mo couples at varying between 1385 1550 °C holding 10 30 min. solidified subjected microstructural characterization means light microscopy scanning electron analyses performed both “top-view” cross-sectioned interfaces. within zone identified using TEM/SAED XRD techniques. It documented that thickness product layer (MoSi2 + Mo5Si3) boron-rich interlayer increases raising Mo substrates.