Paper Title:
The Effect of Protective Coatings on the Oxidation Behavior of 6061Al/SiC Composite at High Temperatures
  Abstract

This paper analyses the effect of protective coatings on the oxidation behavior of 6061Al/SiC composite material at temperatures ranging from 500 to 800 K. Aluminum and AlCrN coatings are employed as protective coatings in order to improve the oxidation resistance of the composite. SEM, EDAX, XRD and oxidation measurement techniques are used to study the oxidation behavior and to characterize the composite specimens. Oxidation of the composite material without protective coatings is seen to be very rapid during the initial stages of exposure to the high temperatures but subsequently slowed down due to the formation of a protective surface layer of oxide. The oxidation was especially severe above 600 K. The interface between the matrix and reinforcement particles and the grain boundary regions of intermetallic precipitates in the matrix enhance this oxidation process since they provided sites for oxidation initiation. Aluminum coating on the composite obtained by DC magnetron sputtering technique and AlCrN coating obtained by low voltage electron beam evaporation technique reduce the oxidation rate effectively since the interface regions between the matrix and reinforcement, grain boundary regions of the matrix are unexposed to the atmosphere. Aluminum coating provides better oxidation resistance for 6061 Al/SiC composites.

  Info
Periodical
Advanced Materials Research (Volumes 383-390)
Chapter
Chapter 15: Coatings and Surface Engineering
Edited by
Wu Fan
Pages
3949-3953
DOI
10.4028/www.scientific.net/AMR.383-390.3949
Citation
N.K. Udayashankar, S. Rajasekaran, J. Nayak, "The Effect of Protective Coatings on the Oxidation Behavior of 6061Al/SiC Composite at High Temperatures", Advanced Materials Research, Vols. 383-390, pp. 3949-3953, 2012
Online since
November 2011
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Price
$32.00
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