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Boron-doped molybdenum silicides have been already recognized as attractivecandidates for space and ground ultra-high temperature applications far beyondlimits of state-of-the-art nickel based superalloys. In this work, we areexploring a new method for fabricating Mo-Si-B alloys (as coatings or smallbulk components) by utilizing a pressure-less reactive melt infiltrationapproach. The basic assumption of this approach is a synthesis of binary and/orternary and complex intermetallic phases (silicides, borides, borosilicides),through a direct interaction of Si-B melt with molybdenum . The main purpose ofthis work, was to examine the effect of temperature and time of Si-B meltinteraction on the structure and morphology of the formed reaction products.For this purpose, sessile drop experiments were carried out on the eutecticSi-3.2B (wt%) alloy/Mo couples at temperature varying between 1385-1550{\deg}Cand holding time between 10 to 30 minutes. The solidified sessile drop coupleswere subjected to microstructural characterization by means of light microscopyand scanning electron microscopy analyses performed both at "top-view" andcross-sectioned interfaces. The phases formed within the interaction zone wereidentified by using TEM/SAED and XRD techniques. It was documented that athickness of both main product layer (MoSi2+Mo5Si3), as well as boron-richinterlayer increases with raising temperature and time of the Si-B meltinteraction with Mo substrates.

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