Evaluation of adhesive and frictional properties of solid lubricants for powder metallurgy by surface force apparatus

Hanako Shimamoto, Shigeru Unami, Masashi Mizukami, Kazue Kurihara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Iron-based powder mixtures for the powder metallurgy (PM) process commonly contain solid lubricants. Both zinc stearate (ZnSt) and N,N'-ethylenebis(stearamide) (EBS), which are conventional lubricants in this field, exhibit similarly adequate lubrication performances. However, their effects on the powder mixture flowability are different; that is, ZnSt causes better flow than EBS. In this study, the adhesive and frictional properties of the five surface combinations (Fe-Fe, Fe-EBS, Fe-ZnSt, EBS-EBS, and ZnSt-ZnSt) were investigated using surface forces and resonance shear measurement. The adhesion forces obtained for all combinations were almost the same. On the other hand, friction forces for Fe-EBS and EBS-EBS combinations, obtained from resonance shear measurement, were larger than others, especially at low applied load (< ca. 1.0 mN). This result suggests that the frictional properties of lubricants at low applied load determine the powder mixture flowabilities.

Original languageEnglish
Title of host publicationEuro PM 2019 Congress and Exhibition
PublisherEuropean Powder Metallurgy Association (EPMA)
ISBN (Electronic)9781899072514
Publication statusPublished - 2019
EventEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2019 - Maastricht, Netherlands
Duration: 2019 Oct 132019 Oct 16

Publication series

NameEuro PM 2019 Congress and Exhibition

Conference

ConferenceEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2019
CountryNetherlands
CityMaastricht
Period19/10/1319/10/16

Keywords

  • Adhesion
  • Friction
  • Lubricant
  • N,N'-ethylenebis(stearamide)
  • Powder flowability
  • Surface forces apparatus
  • Zinc stearate

ASJC Scopus subject areas

  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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