Sliding wear evaluation of hot isostatically pressed thermal spray cermet coatings

V. Stoica, R. Ahmed, M. Golshan, S. Tobe

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The principal aim of this study was to compare the sliding wear performance of as-sprayed and Hot Isostatically Pressed (HIPed) thermal spray cermet (WC-12Co) coatings. Results indicate that HIPing technique can be successfully applied to post-treat thermal spray cermet coatings for improved sliding wear performance, not only in terms of coating wear, but also in terms of the total volume loss for test couples. WC-12Co coatings sprayed by a HVOF system were deposited on SUJ-2 bearing steel substrate and then encapsulated and HIPed at 850 °C for one hour. A high frequency reciprocating ball on plate rig was used to measure the sliding wear resistance of these coatings in dry conditions under steel and ceramic contact configurations at two different loads. Results are discussed in terms of coating microstructure, microhardness, fracture toughness and residual stress evaluations. Microstructural investigations indicate fundamental changes in grain morphology, whereas x-ray diffraction revealed beneficial transformations in phase composition of these coatings during the HIPing post treatment. The effects of these microstructural changes on the physical properties and wear resistance are discussed.

Original languageEnglish
Pages (from-to)93-107
Number of pages15
JournalJournal of Thermal Spray Technology
Volume13
Issue number1
Publication statusPublished - Mar 2004

Keywords

  • Hot isostatic pressing
  • Mechanical properties
  • Microstructure
  • Residual stress
  • Sliding wear
  • Thermal spray coatings
  • WC-Co
  • Wear mechanisms

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