Titanium matrix reinforced composites produced by hot pressing of plasma-sprayed preforms
T Valente, S Picchiotti, C Bartuli
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Abstract
The present work is focused on the fabrication of long? bre reinforced titanium composites by hot pressing of plasma-sprayed preforms. Thermal spraying of two different metallic matrices [Ti–6Al–2Sn– 4Zr–2Mo–0.08Si (Ti6242S) and Ti–4.5Al–3V–2Mo–2Fe (SP700)] onto prearranged silicon carbide long? bres was performed using controlled-atmosphereplasma spraying equipment (CAPS), allowing deposition processes also in the high-pressure range. After optimization of the plasma spraying procedure, composite multilayers were fabricated by hot pressing at 1200bar with different combinations of process parameters (temperature in the range 850–940ˉC, and application time from 30 to 45min). Consolidated samples were characterized by microstructural investigation and tensile testing at room and high temperature (up to 600ˉC). Push-out and push-back tests were performed to investigate interfacial properties.
Key words:titanium alloy, silicon carbide, composites, high-pressure plasma spraying, controlled-atmosphere plasma spraying, hot pressing, tensile tests, push-out, push-back
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