Improvement in Oxidation Resistance of IMI834: Comparison Between Implantation and Coating; a Quest

摘要

Although IMI834 is designed to have high oxidation resistance, its surface can be further improved after nitrogen ion implantation or titanium nitride coating. It is well known that oxidation resistance can be improved after implantation and coating, but up to what extent, depends a lot on the temperature at which it is used. TiN is formed after nitrogen ion implantation in IMI834 as confirmed from glancing angle XRD. For comparison between implantation and coating, same thickness of TiN equal to that of the nitrogen ion range is deposited on IMI834 and oxidation behavior is analyzed at different temperatures. Surface of the samples were analyzed using Scanning electron microscope, Rutherford backscattering spectroscopy, compound formation using glancing angle XRD and nanohardness was measured using nanoindentor. Oxidation resistance of the unimplanted, implanted and coated samples was compared at three different temperatures (500, 700 and 800C). It is observed that oxidation resistance is better for the implanted samples at higher temperature whereas oxidation resistance is better for the TiN coated samples at lower temperature.