Paper Title:
Characterization of Coatings by SEM Based Microdiffraction
  Abstract

The behaviour of a coating is directly related to its microstructure as well as the crystal structure and composition of different phases that are formed in the deposition process. A comprehensive study of the microstructure and local phase assembly in coatings would help in arriving at structure-property correlations that can help understand the coating behaviour. SEM-based diffraction techniques provide a simple method for obtaining local crystallographic information without the need for complex synchrotron sources. In this study, we present a method for characterization of coatings using SEM-based microdiffraction which involves the combined use of the EDS and EBSD capabilities, citing a Ti-Al-Cr-N multilayer coating as an example. The different layers in the coating were observed and the electron beam focused in each region to first obtain Energy Dispersive Spectra and electron backscatter patterns (EBSPs). The elemental constituents were identified from EDS maps and used to shortlist the possible phases present. The diffraction pattern for each possible phase was then calculated and the EBSPs of the observed and calculated patterns were compared for the closest match. The identified phase was then used as an input to set up EBSD scans across the coating. A qualitative picture of the compositional variation in multilayer coatings was obtained that could help in arriving at the exact stoichiometry of the different layers. Hence, SEM-based microdiffraction allows identification of local crystallographic phases and composition, permitting detailed microstructural studies that would find special application in the study of coatings.

  Info
Periodical
Materials Science Forum (Volumes 702-703)
Chapter
Chapter 4: Technique
Edited by
Asim Tewari, Satyam Suwas, Dinesh Srivastava, Indradev Samajdar and Arunansu Haldar
Pages
570-573
DOI
10.4028/www.scientific.net/MSF.702-703.570
Citation
R. C. Gundakaram, S. P. Pemmasani, "Characterization of Coatings by SEM Based Microdiffraction", Materials Science Forum, Vols. 702-703, pp. 570-573, 2012
Online since
December 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tae Ho Shin, Ji Heang Yu, Shi Woo Lee, In Sub Han, Doo Won Seo, Ki Seok Hong, Sang Kuk Woo, Sang Hoon Hyun
1114
Authors: Damiano Galvan, Y.T. Pei, Jeff T.M. de Hosson, Albano Cavaleiro
Abstract:A commercial RF-sputtering deposition rig was employed to deposit H-free diamond-like carbon (DLC) coatings. The influence of alloying...
1026
Authors: G. Deniz, Saduman Sen, Ugur Sen
Abstract:In this work, some surface properties of AISI M2 steel were improved by a thermoreactive deposition process. Gas nitriding was realized on...
219
Authors: N. Pistofidis, G. Vourlias, D. Chaliampalias, F. Stergioudis, Efstathios K. Polychroniadis
Abstract:In the present work the phases of the zinc coatings deposited with hot-dip galvanizing, pack cementation and wire flame spraying are examined...
93
Authors: San Ming Du, Yong Ping Niu, Yong Zhen Zhang
Chapter 5: Coatings and Surface Engineering
Abstract:In the present study, 20 Wt. % ZrO2-Al2O3-17 wt.% TiO2 powders were sprayed using a plasma-spray...
420