From APS to HVOF spraying of conventional and nanostructured titania feedstock powders : A study on the enhancement of the mechanical properties

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2004.10.137
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TypeArticle
Journal titleSurface & Coatings Technology
Volume200
Issue11
Pages34283437; # of pages: 10
SubjectAbrasive wheel test; Bond strength test (ASTM C633); Scanning electron microscopy (SEM); Thermal spraying; Titanium oxide; Nanostructured coating
AbstractNanostructured and conventional titania (TiO2) feedstocks were thermal sprayed using air plasma spray (APS) and high-velocity oxy-fuel (HVOF). The HVOF-sprayed coatings made from the nanostructured feedstock exhibited superior abrasion resistance, bond strength and crack propagation resistance when compared to the coatings made from the conventional feedstocks sprayed using HVOF and APS. The enhancement of the mechanical properties was due to (i) the processing (HVOF) and (ii) the nanocharacter of the feedstock. It was found that the HVOF-sprayed coating made from the nanostructured feedstock exhibited isotropic characteristics and microstructure with tiny zones of agglomerated nanostructured particles randomly spread throughout the coating structure. It was observed that these nanostructured zones acted as crack arresters by blunting and branching crack tips, enhancing the crack propagation resistance of the coating. Due to the isotropic characteristics of mechanical properties, the HVOF-sprayed coating made from the nanostructured feedstock exhibited uniform crack propagation under Vickers indentation, i.e., four cracks emanating from the corners of the Vickers indentation impression.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number46948
NPARC number15861567
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Record identifier209a11de-b05c-4ce8-9e9d-8f6cc1102144
Record created2010-07-30
Record modified2016-05-09
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