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Materials and Manufacturing Processes Volume 28, 2013 - Issue 12
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Original Articles

Characterization of Aluminum Coatings Formed on Porous Ferritic Stainless Steels by Pack Cementation

M. Reza Bateni Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada; Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario, Canada
,
Ping Wei Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario, Canada
,
Olivera Kesler Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada
&
Anthony Petric Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario, CanadaCorrespondence[email protected]
Pages 1314-1321 | Received 05 May 2013, Accepted 30 Sep 2013, Published online: 13 Dec 2013
 
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Abstract

Pack cementation is an attractive method for the formation of aluminum coatings on metal substrates. When applied to porous stainless steel substrates, the aluminum vapour species can diffuse into the pores and coat the interior surfaces.

In this study, aluminum coatings were grown on commercial porous UNS 430 stainless steel and freeze cast UNS 440 stainless steel substrates by the pack cementation method. The effects of pack mixture composition, temperature, time, and the morphology of the substrates were characterized by scanning electron microscopy.

It was shown that the degree of coverage of the aluminum coatings increased with porosity of the substrate. In addition, increased reaction time and temperature of the pack led to a more homogeneous distribution of aluminum across the substrate.

ACKNOWLEDGMENTS

We wish to acknowledge the use of the facilities at the Canadian Centre for Electron Microscopy.

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