Abstract
Graphite-molybdenum-titanium composites might attract significant interest as heat sinks for different sector applications due to their excellent thermal, electrical and mechanical properties. This type of composites was already studied but following the powder metallurgy and spark plasma sintering (SPS) route. The aim of the present investigation is to study a new route of fabrication of these composites to improve their properties: colloidal synthesis and SPS process. The results obtained for graphite-10 vol% Mo-1 vol% Ti composites prepared by both routes are compared. It has been proved that the properties of the composites are significantly improved by the colloidal route compared with the powder metallurgy route, i. e. electrical conductivity by a factor of 3, thermal properties by a factor of 8 and bending strength by a factor of 4.
Highlights
Graphite-molybdenum composites have been subject of research for many years due to the excellent thermal-mechanical properties conferred by the graphite and molybdenum carbides, which are formed when sintered together, combined with a low density (~2.5 g/cm3), refractory character, high thermal stability and good thermal and elec trical conductivities
As opposed to the above-mentioned research articles, which are focused on graphite-molybdenum composites to be used in extreme conditions applications, the aim of the present work is to study the in fluence of using a colloidal route instead of the powder metallurgy one in the final properties of graphite-molybdenum-titanium composites after sintering them by spark plasma sintering
As in the case of other properties, better results are obtained in the case of samples synthesized by colloidal route
Summary
Graphite-molybdenum composites have been subject of research for many years due to the excellent thermal-mechanical properties conferred by the graphite and molybdenum carbides, which are formed when sintered together, combined with a low density (~2.5 g/cm3), refractory character, high thermal stability and good thermal and elec trical conductivities. White and Pontelandolfo appreciated an improvement of thermal, electrical, and mechanical properties of graphite-molybdenum carbide composites to be used for hightemperature nuclear and aerospace applications prepared at tempera tures that involved liquid phase [3,4,5]. They prepared by conventional molding the graphite-carbide bodies that were subsequently fired at 1800 ◦C. Harada and Rubin [6] investigated different mixtures of graphite-metals and graphite-metal carbides, including molybdenum, for which they studied the temperature when carbides appear and analyzed their electrical and mechanical properties They prepared the composites by hot pressing of binary mixtures of carbon (petroleum coke was used as graphite source) and metal or metal carbide. Graphite-molybdenum composites are used for extreme conditions applications
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