Enhanced Ductility in Thermally Sprayed Titania Coating Synthesized Using a Nanostructured Feedstock

Download
  1. (PDF, 1 MB)
  2. Get@NRC: Enhanced Ductility in Thermally Sprayed Titania Coating Synthesized Using a Nanostructured Feedstock (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.msea.2004.12.039
AuthorSearch for: ; Search for:
TypeArticle
Journal titleMaterials Science and Engineering A
Volume395
Issue1-2
Pages269280; # of pages: 12
Subjectthermal spray; titania (TiO2); nanostructure; ductility; abrasion resistance; bond strength
AbstractNanostructured and conventional titania (TiO2) feedstock powders were thermally sprayed via high velocity oxy-fuel (HVOF). The microstructure, porosity, Vickers hardness, crack propagation resistance, bond strength (ASTM C633), abrasion behavior (ASTM G65) and the wear scar characteristics of these two types of coatings were analyzed and compared. The coating made from the nanostructured feedstock exhibited a bimodal microstructure, with regions containing particles that were fully molten (conventional matrix) and regions with embedded particles that were semi-molten (nanostructured zones) during the thermal spraying process. The bimodal coating also exhibited higher bond strength and higher wear resistance when compared to the conventional coating. By comparing the wear scars of both coatings (via scanning electron microscopy and roughness measurements) it was observed that when the coatings were subjected to the same abrasive conditions the wear scar of the bimodal coating was smoother, with more plastically deformed regions than the conventional coating. It was concluded that this enhanced ductility of the bimodal coating was caused by its higher toughness. The results suggest that nanostructured zones randomly distributed in the microstructure of the bimodal coating act as crack arresters, thereby enhancing toughness and promoting higher critical depth of cut, which provides a broader plastic deformation range than that exhibited by the conventional coating. This work provides evidence that the enhanced ductility of the bimodal coating is a nanostructured-related property, not caused by any other microstructural artifact.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number47574
NPARC number15955052
Export citationExport as RIS
Report a correctionReport a correction
Record identifierb6674ac0-7266-4322-bf9e-97bdd1cf28b1
Record created2011-01-10
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)