In-situ formation of self-lubricating tribo-films for dry machinability

Sumitomo, Taro, Aizawa, Tatsuhiko and Yamamoto, Shigeo (2005). In-situ formation of self-lubricating tribo-films for dry machinability. In: Surface & Coatings Technology: The 32nd International Conference On Metallurgical Coatings And Thin Films: ICMCTF 2005. The 32nd International Conference On Metallurgical Coatings And Thin Films: ICMCTF 2005, San Diego, California, U.S.A., (1797-1803). 2-6 May 2005. doi:10.1016/j.surfcoat.2005.08.055


Author Sumitomo, Taro
Aizawa, Tatsuhiko
Yamamoto, Shigeo
Title of paper In-situ formation of self-lubricating tribo-films for dry machinability
Conference name The 32nd International Conference On Metallurgical Coatings And Thin Films: ICMCTF 2005
Conference location San Diego, California, U.S.A.
Conference dates 2-6 May 2005
Convener The American Vacuum Society
Proceedings title Surface & Coatings Technology: The 32nd International Conference On Metallurgical Coatings And Thin Films: ICMCTF 2005   Check publisher's open access policy
Journal name Surface   Check publisher's open access policy
Place of Publication Lausanne, Switzerland
Publisher Elsevier Sequoia S.A.
Publication Year 2005
Sub-type Fully published paper
DOI 10.1016/j.surfcoat.2005.08.055
ISSN 0257-8972
1879-3347
Volume 200
Issue 5-6
Start page 1797
End page 1803
Total pages 7
Language eng
Formatted Abstract/Summary
Significant reductions in friction coefficient during sliding tests of Cl-implanted TiN films were attributed to tribological reactions leading to the formation of TiO and shear deformable Magneli phase oxide (TinO2n—1), which are thought to act as a self-lubricant. Turning tests using cutting tools with Cl-implanted TiN and TiCN protective coatings have resulted in reduced friction and wear.

Two types of experiments have been carried out to study the formation of Ti-oxides in the presence of chlorine, and their relation to the improvement in dry machining performance. Firstly, unimplanted and Cl-implanted titanium films were oxidized in air at 400°C to simulate in-situ oxidation in conditions similar to local heating during machining. Secondly, the oxide tribo-films formed on the cutting surface of unimplanted and implanted TiCN coated tools used in turning tests were examined in order to relate the oxide formation to improved cutting behaviour.

Significantly greater amounts of TiO and intermediate Ti-oxides including TiOx (1<x<2) and Magneli phases were found in the Climplanted samples analysed by X-ray photoelectron spectroscopy (XPS) in comparison to the unimplanted samples. The implanted chlorine atoms may have a catalytic role in the formation of Ti-oxides from Ti or TiCN. Furthermore, chlorine forms bonds with titanium, which reduces vacancies for oxygen during the oxidation reactions. This results in the formation of the lower order Ti-oxides instead of TiO2.
© 2005 Elsevier B.V. All rights reserved.
Subjects 0306 Physical Chemistry (incl. Structural)
0912 Materials Engineering
Keyword Dry machining
Self lubrication
TiN coating
Ti oxides
Chlorine
Q-Index Code EX
Additional Notes Presented during Symposium E5/G4: "Tribology of Coatings and Thin Films / Tribological Studies of Coatings for Green Manufacturing and Dry Machining" as Session E5/G4-4.

 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 14 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 19 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 18 Mar 2010, 09:21:52 EST by Jon Swabey on behalf of Faculty Of Engineering, Architecture & Info Tech