Tribological properties of a-CNx coatings sliding against SiC balls in ethylene glycol aqueous solution

Fei Zhou, Bin Yue, Qianzhi Wang, Xiaolei Wang, Adachi Koshi, Koji Kato

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Amorphous carbon nitride(a-CNx) coatings were deposited on SiC disks by using ion beam assisted deposition, and their bonding structure and hardness were determined using X-ray photoelectron spectroscopy and nano-indenter, respectively. The contact angles on the surface of the a-CN x coatings were measured with contact angle meter. The friction and wear behaviours of the a-CNx/SiC tribopairs in ethylene glycol aqueous solution were investigated with ball-on-disk tribometer. The results indicated that the a-CNx coatings contained 12at. % nitrogen and their bonding structure consisted of sp2C=N/C=C and sp3C-N bonds. The static contact angles on the a-CNx coatings decreased with the ethylene glycol concentration. The lowest coeffi cient of friction of 0.019 was acquired as the ethylene glycol concentration was 10vol. %. When the ethylene glycol concentration increased, the specifi c wear rate of the SiC ball fl uctuated in the range of 5.9 × 10-10∼1.1 × 10-9 mm3 Nm-1, while that of a-CNx coatings varied in the range of 3.3 × 10-8∼7.8 × 10-8 mm3 Nm-1.

Original languageEnglish
Pages (from-to)225-236
Number of pages12
JournalLubrication Science
Issue number6-7
Publication statusPublished - 2010 Jun


  • Amorphous carbon nitride coatings
  • Ethylene glycol aqueous solution
  • Friction
  • Wear


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