Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide Size in Fine and Coarse Particle Abrasion

Arash Ghabchi, Tommi Varis, Erja Turunen, Tomi Suhonen, Xuwen Liu, S-P. Hannula

Research output: Contribution to journalArticleScientificpeer-review

52 Citations (Scopus)

Abstract

A modified ASTM G 65 rubber wheel test was employed in wet and dry conditions using 220 nm titania particles and 368 lm sand particles, respectively. Both tests were conducted on WC-CoCr coatings produced with two powders with different carbide grain sizes (conventional and sub-micron) to address the effect of carbide size and abrasive medium characteristics on the wear performance. The same spot before and after the wet abrasion wear testing was analyzed in detail using SEM to visualize wear mechanisms. It was shown that the wear mechanism depends on the relative size of the carbide and abrasive particles. Wear mechanisms in dry sand abrasion were studied by analyzing the single scratches formed by individual abrasive particles. Interaction of surface open porosity with moving abrasive particles causes formation of single scratches. By tailoring the carbide size, the wear performance can be improved.
Original languageEnglish
Pages (from-to)368-377
JournalJournal of Thermal Spray Technology
Volume19
Issue number1-2
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Keywords

  • HVOF
  • rubber wheel abrasion test
  • WC-CoCr
  • wear mechanism
  • ProperTune

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