Influence of Nitrogen Flow Rate in Reducing Tin Microdroplets on Biomedical Ti-13zr-13nb Alloy

Abstract

Cathodic arc physical vapor deposition (CAPVD) is one of the promising techniques that have a potential to coat titanium nitride (TiN) on biomedical implants due to its good adhesion and high evaporation rate. However, this method emits microdroplets which have the possible detrimental effect on the coating performance. Past studies indicated that micro droplets can be controlled through proper deposition parameters. In the present work, an attempt was made to study the effect of nitrogen gas flow rates (100 to 300 sccm) on TiN coating of the Ti-13Zr-13Nb biomedical alloy. Scanning electron microscopy (SEM) was used to evaluate surface morphology and coating thickness while crystal phase of the coated substrates was determined using X-Ray Diffraction (XRD). Image analysis software was employed to quantify microdroplets counts. Results show that higher nitrogen gas flow rate able to decrease a significant amount of microdroplets and concurrently increase the thickness of TiN coating. A mixed crystal planes of (111) and (220) are obtained on the coated substrates at this setting which exhibits denser structure with higher adhesion strength as compared to substrates coated at the lower N2 gas flow rate.

Phase Transitions in Casting Process of Beryllium Oxide Slip

“…The thermophysical properties of the beryllium oxide slip are determined by the empirical Eq. (1)- (8). In the casting mould, there is a transition of the liquid suspension into a solid state.…”

“…The thermophysical properties of the slip are expressed by the empirical Eq. (1)- (8). Condition of the mass flow rate conservation allows to determine the pressure gradient for the thermoplastic slip extruding from the casting mold [21]…”

“…As a result, in practice, mouldings are not of required quality, productiveness is low and output of items is poor due to the complexity of controlling the structure formation of a semi-finished product. A significant role in the homogeneous structure formation of the resulting products plays an ultrasonic (US) activation effect [8].…”

Performance Enhancement of Energy Saving and Machining Characteristic in Electrical Discharge Machining on Magnesium Alloy: A Review

“…A few review papers have discussed on surface improvement by using difference method due to increase corrosion resistance [18][19][20][21]. In this paper, we try to review the EDM on Magnesium alloys as presented in previous published data with so much closer.…”

The Influence of Ultrasonic Vibration Frequency on the Properties of TiN Coated Biomedical Ti–13Zr–13Nb

“…Common surface modification techniques include Chemical Vapor Deposition (CVD) [10], Physical Vapor Deposition (PVD) [11][12][13][14], Ion Implantation [15], Plasma Spray coating [16], Sol Gel [17,18], Nitriding [19], and Thermal Oxidation [20,21]. Among these, the PVD technique shows promising results by offering a low processing temperature (<500 • C) over a wide range of coating thicknesses as compared to other methods.…”