Abstract
This investigation focuses on the feasibility of reaction synthesis of Ti 3SiC 2 phase using plasma spraying of powder mixture of Ti, SiC and graphite. In-flight particle diagnostics suggested that dwell (reaction) time of these powder mixture is very short (∼10 −4 s) during plasma spraying. Phase identification and microstructural characterizations of the as-sprayed coatings were conducted using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thermodynamic calculations on Ti–SiC–C system were also made. Reaction mechanism of Ti 3SiC 2 synthesis during plasma spray is proposed. Although relatively lower volume percentage of Ti 3SiC 2 (∼15–19%) phase was found in the plasma sprayed coating, reaction synthesis of Ti 3SiC 2 phase using plasma spray provides a potential processing technique to fabricate Ti 3SiC 2 as a protective coating on large engineering components.
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