Harpreet Singh

Abstract:

One of the major problems faced by the biomedical industry is the lack of long-term corrosion resistant materials compatible to the human body environment. Such incompatibility causes several problems such as implant loosening, osteolysis, joint pain and Alzheimer. Surface modifications of the implant materials has shown to help resolve these issues to a greater extent. In this regard, several coating techniques have been used by the researchers, among which thermal spray (TS) is one of the most widely accepted coating techniques to mitigate the above-mentioned problems. However, high processing temperature in thermal spray is a point of concern. To reduce high-temperature effects, we developed coatings by cold spray (CS) technique. Cold spray is a solid-state coating technique utilizing a processing temperature that is far below the melting point of the coating materials. Hence, temperature sensitive materials like titanium and hydroxyapatite can be sprayed without any phase change. Recent studies show that hydroxyapatite can be replaced by a calcium silicate compound (baghdadite –〖Ca〗_3 Zr〖Si〗_2 O_9). Pham et al. [1] showed baghdadite provides superior mechanical and biological properties compared to hydroxyapatite. We developed a novel coating to enhance the corrosion resistance of the implant materials. Titanium/Baghdadite composite coatings are fabricated using high pressure cold gas spray system. Initial characterizations are performed on Scanning electron microscopy (SEM), X-Ray diffraction (XRD), and Energy dispersive spectroscopy (EDS). Furthermore, electrochemical corrosion behavior of the coatings is also performed to evaluate the corrosion behaviour of the developed coatings.