Low pressure cold spray coating of Ti-6Al-4V with SiC-based cermet

• Low pressure cold spray deposition of SiC-based cermet on Ti-6Al-4V was investigated.
• No detrimental phase transformation, decomposition and/or decarburization of the SiC.
• Peak shift observed between the phases in the feedstock powder and the coatings.
• Impact-induced micro-straining, amorphization and grain refinement observed.
• Coatings have minimal porosity and improved micro-hardness value.

The possibility of using the low pressure cold spray system to deposit SiC-based cermet on Ti-6Al-4V was investigated at 0.99 Mpa for 450, 500 and 550 °C. The characterizations of the coatings reveal that the initial phases in the feedstock powder were retained in the coatings. No detrimental phase transformation, decomposition and/or decarburization of the SiC. There was peak shift between the phases of the feedstock powder and that of the coatings. This is traced to impact-induced micro-straining, amorphization and grain refinement. Low pressure cold spray coating of Ti-6Al-4V with SiC-based cermet is plausible with partially homogenous distribution of the SiC, minimal porosity and improved micro-hardness value (approx 652±12.7 HV0.3) in the coating.

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