Processing, microstructure, properties, and applications of MoSi2-containing composites: a review

Abstract

Intermetallic molybdenum disilicide (MoSi2) possesses unique physical, chemical, thermal, and mechanical properties that make it compatible with some ceramics (SiC, Al2O3) and metals (Cu, Al) to manufacture composite materials. Its current applications, chiefly limited to heating elements, can be expanded if its properties are judiciously combined with those of other materials like SiC or Al to produce ceramic- and metal-matrix composites with improved mechanical, thermal, functional, or even multifunctional properties. This review presents a perspective on the feasibility of manufacturing ceramic- and metallic-based MoSi2 composite materials. A comprehensive discussion of the pros and cons of current liquid-state and solid-state processing routes for MoSi2 metal-matrix composites and the resulting typical microstructures is presented. Although MoSi2 has been studied for more than five decades, it was not until recently that industrial applications demanding high temperature and corrosion resistance started utilizing MoSi2 as a bulk material and a coating. Furthermore, beyond its traditional use due to its thermal properties, the most recent applications include it as a contact material in microelectronic components or circuits and optoelectronics. The short-term global growth predicted for the MoSi2 heating elements market is expected to significantly impact possible new applications, considering its potential for reuse and recyclability. A prospective assessment of the application of recycled MoSi2 to composite materials is presented.

Modification of Microstructure and Surface Properties of Ti-6Al-4V Alloy by MoSi2 Particles Using Micro-Arc Oxidation Process

“…The results indicated that as the thickness of the outer layer and close of porosity, the hardness values increased with adding of MoSi 2 , which significantly improved the micro hardness value Most likely, the hardness and wear resistance properties important factors such as coating structure and of coatings are more strongly affected by morphologies, and pores distribution than coatings thickness [30]. Furthermore, different sizes of pan-like or sphere-like geometric pores, which are the result of the molten liquid that swiftly hardened and left distinct borders around the pores, characterize the morphologies that may be observed in the structure.…”

“…Results from wear test carried out for different times (30,60,90,120 In general, the weight losses varied with duration of rubbing and normal load at constant sliding velocity, and there were some "negative weight losses" for coating C. The explanation for this case is that the surface of the sample contained asperities, and at the beginning of the test the frictional thrust increased, which resulted in increased debonding and sub-surface fracture of the asperities, and thereafter ,led to a clear loss of weight for ascertain duration of rubbing. After that, the surface was becoming smoother and the loss of weight remained almost non-existent, for Furthermore, the incorporation of MoSi 2 recorded the best improving in wear resistance among the other samples due to the high mechanical properties of MoSi 2 particles and their effects in filling the micropores [36], and therefore reducing the surface roughens.…”