Structural and property investigation of ceramic composite coating fabricated on titanium alloys by high power diode laser alloying

Abstract

The laser alloying technique is proposed and demonstrated to synthesize titanium silver nitride-based (Ti-Ag-N, TiN/TiAg) composite coating on Ag electroplated Cp-Ti and Ti6Al4V substrates under nitrogen shielding. The laser alloying was carried out using a continuous wave mode fiber coupled diode laser at 980 nm laser wavelength. Nitrogen shielding was useful to avoid interference from atmospheric oxygen and induce the formation of titanium nitride (TiN) phases. The formation of the TiN/TiAg composite was confirmed through surface morphology studies. The microstructural features and microhardness values (around 1000 HV_0.2) confirmed the formation of composite Ti-Ag-N phases in the titanium alloy surface. In Ti6Al4V substrate laser alloyed with Ag and N, the formation of dendrites and columnar growth of the composite phases were observed. Ag was homogeneously distributed in the Ti/Ni matrix, and as the Ag coating thickness increased, the average microhardness of the laser alloyed coating decreased slightly.

Keywords

Titanium silver nitride laser alloying biomedical implants commercially pure titanium Ti6Al4V

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