TY - JOUR
T1 - Enhanced tribological performance of alumina composites reinforced with acid-treated carbon nanotubes under water lubrication
AU - Shirasu, Keiichi
AU - Miyaura, Takuto
AU - Yamamoto, Go
AU - Suzuki, Takaharu
AU - Naito, Kimiyoshi
AU - Hashida, Toshiyuki
N1 - Funding Information:
The authors thank Dr. T. Miyazaki of Technical Division, School of Engineering, Tohoku University, for technical assistance in the TEM analysis; Dr. H. Yasufuku of Materials Analysis Station, National Institute for Materials Science, for technical assistance in the XPS analysis; Mr. T. Nakamura of the Fracture and Reliability Research Institute (FRRI), Tohoku University, for helpful assistance with the friction tests; and Enago ( https://www.enago.jp ) for correcting the English. This work was supported by JSPS KAKENHI Grant Numbers JP21226004 , JP15H05502 and JP16K20904 . This work was performed under the Inter-university Cooperative Research Program (Proposal No. 17G0215) of the Institute for Materials Research, Tohoku University.
Funding Information:
The authors thank Dr. T. Miyazaki of Technical Division, School of Engineering, Tohoku University, for technical assistance in the TEM analysis; Dr. H. Yasufuku of Materials Analysis Station, National Institute for Materials Science, for technical assistance in the XPS analysis; Mr. T. Nakamura of the Fracture and Reliability Research Institute (FRRI), Tohoku University, for helpful assistance with the friction tests; and Enago (https://www.enago.jp) for correcting the English. This work was supported by JSPS KAKENHI Grant Numbers JP21226004, JP15H05502 and JP16K20904. This work was performed under the Inter-university Cooperative Research Program (Proposal No. 17G0215) of the Institute for Materials Research, Tohoku University.
PY - 2020/1
Y1 - 2020/1
N2 - Alumina composites reinforced with acid-treated multiwalled carbon nanotubes (MWCNTs) are prepared, and the tribological properties of the composite are investigated under water-lubricated conditions using a ball-on-disk technique against an alumina ball. The coefficient of friction (COF) in the steady-state region of the composite with acid-treated MWCNTs is found to be 0.06, which is 32–37% lower than that of the monolithic alumina and the composite with pristine MWCNTs. Microstructural observations and in-depth Raman spectroscopy analyses of the disk samples and counterparts before and after the friction tests reveal that the MWCNTs located in pits on the disk surface pull-out and that the resultant MWCNT fragments adhere to the friction surface of the counterparts. The enhanced tribological performance shown in the composite with acid-treated MWCNTs is mainly because the negatively charged functional groups adsorbed on the MWCNTs participate in the hydrogen-bond network of the hydrodynamic lubrication film and lead to acceleration of the transformation from a boundary lubrication regime to a mixed lubrication regime.
AB - Alumina composites reinforced with acid-treated multiwalled carbon nanotubes (MWCNTs) are prepared, and the tribological properties of the composite are investigated under water-lubricated conditions using a ball-on-disk technique against an alumina ball. The coefficient of friction (COF) in the steady-state region of the composite with acid-treated MWCNTs is found to be 0.06, which is 32–37% lower than that of the monolithic alumina and the composite with pristine MWCNTs. Microstructural observations and in-depth Raman spectroscopy analyses of the disk samples and counterparts before and after the friction tests reveal that the MWCNTs located in pits on the disk surface pull-out and that the resultant MWCNT fragments adhere to the friction surface of the counterparts. The enhanced tribological performance shown in the composite with acid-treated MWCNTs is mainly because the negatively charged functional groups adsorbed on the MWCNTs participate in the hydrogen-bond network of the hydrodynamic lubrication film and lead to acceleration of the transformation from a boundary lubrication regime to a mixed lubrication regime.
KW - Acid treatment
KW - Carbon nanotubes (CNTs)
KW - Ceramic-matrix composites
KW - Coefficient of friction (COF)
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U2 - 10.1016/j.diamond.2019.107657
DO - 10.1016/j.diamond.2019.107657
M3 - Article
AN - SCOPUS:85076252457
VL - 101
JO - Diamond and Related Materials
JF - Diamond and Related Materials
SN - 0925-9635
M1 - 107657
ER -