Tribological performance of halloysite clay nanotubes as green lubricant additives

Laura Peña-Parás, Demófilo Maldonado-Cortés, Patricio García, Mariana Irigoyen, Jaime Taha-Tijerina, Julia Guerra

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


© 2017 Elsevier B.V. Nanoparticles have been recently explored as lubricant additives for improving tribological performance of metal-forming tools. Halloysite clay nanotubes (HNTs) are naturally-occurring, low-cost, and non-toxic nanoparticles, making them attractive as green lubricant additives. In this study, HNTs were dispersed at varying concentrations (0.01, 0.05, and 0.10 wt%) within a polymeric lubricant for metal-forming applications. The ITeE-PIB Polish method for testing lubricants under scuffing conditions was conducted with a four-ball tribotester in order to obtain the scuffing load and load-carrying capacity (poz) under extreme pressures (EP), as this method has demonstrated to be sensitive to extreme-pressure additives; a block-on-ring test was used to obtain wear volume loss and coefficient of friction (COF). Surface roughness of worn materials was characterized with an optical 3D-surface measurement system. Results showed that 0.05 wt% HNTs delayed scuffing initiation, and increased the scuffing load and load-carrying capacity by 50% and ~72%, respectively. Wear volume loss and COF were both lowered by ~70%, and surface roughness was reduced due to the formation of a tribofilm. The improved lubrication provided by environmentally-friendly HNT lubricant additives shown in this study may result in considerable cost savings through lower energy consumption and longer tool life.
Original languageEnglish
Pages (from-to)885-892
Number of pages8
Publication statusPublished - 1 Jan 2017

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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