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Design of stainless steel porous surfaces by oxide reduction with hydrogen

Author:
Badin, Valentin  Diamanti, Entela  Foret, Pierre  Horgnies, Matthieu  Darque-Ceretti, Evelyne  


Journal:
MATERIALS & DESIGN


Issue Date:
2015


Abstract(summary):

A new method to create porous surfaces on stainless steel by reducing oxide scales with hydrogen at 1100 degrees C has been investigated. Mercury Intrusion Porosimety (MIP) along with Scanning Electron Microscopy (SEM) have been used to successfully study the porosity of the surfaces. Two different sets of parameters led to different morphologies. The first type of surface results from a 5 min reduction of a wilstite FeO surface oxide layer and provides smooth micrometer scale pores with a Gaussian distribution size. The second type of surface results from a 3 h reduction of a chromium rich oxide layer and provides three different micrometer scale pore size distributions with burst morphology. The volume of the porosity has been compared to its precedent oxide scale volume. The non-stoichiometry of wfistite is believed to be the main factor influencing the difference in the pore creation mechanism as compared to the mechanism of reduction from chromium-rich oxide. (C) 2015 Elsevier Ltd. All rights reserved.


Page:
765---770


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