Microscopic study of sliding wear surfaces of alumina

Tetsuya Senda, Yoh Ichi Kawagoe, Noriyuki Kotani, Kenji Murakami, Koshi Adachi

Research output: Contribution to journalArticlepeer-review


Sliding wear surfaces of alumina were observed by transmission and scanning electron microscopy. Wear loss was very low (<10-7 mm 3/Nm) at room temperature whereas it was high (>10-5 mm3/Nm) at 500°C. In a mild wear regime at room temperature, a layer of very fine particles (10 nm or less) is observed on the wear surface. Beneath the layer, a deformed bulk surface with extensive dislocations is observed. The layer exhibits a diffraction pattern of a meta-stable phase which is dissimilar to the original α-alumina. The layer appears to act as lubrication film at the contact interface to reduce the wear loss. In a severe wear regime at 500°C, a similar structure consisting of a fine-particle layer and deformed bulk surface is observed. However, extensive microcracks are observed in the layer and the bulk underneath that cause further material removal resulting in a high wear rate.

Original languageEnglish
Pages (from-to)347-350
Number of pages4
JournalKey Engineering Materials
Publication statusPublished - 2006


  • Alumina
  • Microcracking
  • Microscopy
  • Microstucture
  • Plastic deformation
  • Wear

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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