Cold-Sprayed Ni-hBN Self-Lubricating Coatings

I. Smid, A. E. Segall, P. Walia, G. Aggarwal, T. J. Eden, J. K. Potter

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Feedstock preparation strategies were explored to produce composite admixed, milled, and precoated (encapsulated) powders of nickel-hexagonal boron nitride (Ni-hBN) for cold-sprayed self-lubricating coatings. The resulting cold-sprayed coatings were then examined for microstructural homogeneity and composition, as well as bond strength, microhardness, and relevant wear behaviors. Though admixed powders were easy to prepare and economical, milled and precoated formulations provided the advantage of aiding contact between Ni and lubricant powders prior to spraying that ultimately improved deposition and properties. The maximum amount of hBN that could be effectively built into the cold-sprayed Ni coatings was approximately 6 wt%. Results of the study also indicated that the composite coatings exhibited slightly higher hardness and reduced adhesive strength relative to a baseline of pure Ni layers. Moreover, some reductions in friction and expected decreases in bond strength and lubricant uniformity were observed when more than 4 wt% of lubricant was retained in the coatings. Given these findings, the most promising path to improve the amount, uniformity, and influence of the lubricant may be to encapsulate smaller particles with thicker levels of Ni to "trick" the composite particle to bond as pure Ni.

Original languageEnglish (US)
Pages (from-to)599-605
Number of pages7
JournalTribology Transactions
Volume55
Issue number5
DOIs
StatePublished - Sep 1 2012

Fingerprint

Boron nitride
boron nitrides
lubricants
Nickel
Lubricants
nickel
Powders
coatings
Coatings
sprayed coatings
composite materials
Sprayed coatings
Composite coatings
spraying
Composite materials
Spraying
Microhardness
microhardness
adhesives
Feedstocks

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Smid, I. ; Segall, A. E. ; Walia, P. ; Aggarwal, G. ; Eden, T. J. ; Potter, J. K. / Cold-Sprayed Ni-hBN Self-Lubricating Coatings. In: Tribology Transactions. 2012 ; Vol. 55, No. 5. pp. 599-605.
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Cold-Sprayed Ni-hBN Self-Lubricating Coatings. / Smid, I.; Segall, A. E.; Walia, P.; Aggarwal, G.; Eden, T. J.; Potter, J. K.

In: Tribology Transactions, Vol. 55, No. 5, 01.09.2012, p. 599-605.

Research output: Contribution to journalArticle

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