Effect of Temperature and Time on Nickel Aluminide Coating Deposition

  • Ali Dad Chandio Department of Metallurgical Engineering, NED University of Engineering and Technology , Karachi
  • Shahid Hussain Abro Department of Metallurgical Engineering, NED University of Engineering and Technology ,Karachi

Abstract

The βNiAl coating was deposited onto Nickel based CMSX-4 superalloy by in-situ CVD (Chemical Vapor Deposition) method. Main focus of this contribution was to study the influence of aluminizing time and temperature on the microstructure and thickness of the coating; this was followed by examination by XRD (X-Ray Diffraction), electron microscope. Results suggest that an incremental variation in temperature alters the coating activities from HA (High Activity) to LA (Low Activity). This is exhibited by the resultant CT (Coating Thickness) since HA coatings are thicker than LA counterparts. The microstructure of the coating formed at low temperature (or HA ones) showed a large amount of α-Cr precipitates while one formed at high temperature (or LA ones) exhibited lower amounts of such precipitates. Moreover, incremental aluminizing time showed linear trend of CT at initial stage, thereafter (10 hrs) it leveled off. Whereas it does not affect microstructure of the coating

Published
Oct 1, 2018
How to Cite
CHANDIO, Ali Dad; ABRO, Shahid Hussain. Effect of Temperature and Time on Nickel Aluminide Coating Deposition. Mehran University Research Journal of Engineering and Technology, [S.l.], v. 37, n. 4, p. 491-496, oct. 2018. ISSN 2413-7219. Available at: <http://publications.muet.edu.pk/index.php/muetrj/article/view/557>. Date accessed: 09 dec. 2018. doi: http://dx.doi.org/10.22581/muet1982.1804.04.
This is an open Access Article published by Mehran University of Engineering and Technolgy, Jamshoro under CCBY 4.0 International License