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Ultrafine grain formation and coating mechanism arising from a blast coating process: a transmission electron microscopy analysis
Date Issued
2017-10-11
Date Available
2019-03-21T09:14:01Z
Abstract
This article examines the substrate/coating interface of a coating deposited onto mild steel and stainless steel substrates using an ambient temperature blast coating technique known as CoBlast. The process uses a coincident stream of an abrasive blast medium and coating medium particles to modify the substrate surface. The hypothesis for the high bond strength is that the abrasive medium roughens the surface while simultaneously disrupting the passivating oxide layer of the substrate, thereby exposing the reactive metal that then reacts with the coating medium. The aim of this study is to provide greater insight into the coating/substrate bonding mechanism by analysing the interface between a hydroxyapatite coating on both mild and stainless steel substrates. The coating adhesion was measured via a tensile test, and bond strengths of approximately 45 MPa were measured. The substrate/coating interface was examined using transmission electron microscopy and selected area diffraction. The analysis of the substrate/ coating interface revealed the presence of ultrafine grains in both the coating and substrate at interface associated with deformation at the interface caused by particle impaction during deposition. The chemical reactivity resulting from the creation of these ultrafine grains is proposed to explain the high adhesive strength of CoBlast coatings.
Other Sponsorship
Programme for Research in Third Level Institutions (PRTLI), Ireland
Type of Material
Journal Article
Publisher
Wiley Online Library
Journal
Surface and Interface Analysis
Volume
49
Issue
12
Start Page
1271
End Page
1278
Copyright (Published Version)
2017 Wiley
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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Owning collection
Scopus© citations
5
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