TY - JOUR
T1 - Friction and wear properties of CNx/SiC in water lubrication
AU - Zhou, F.
AU - Kato, K.
AU - Adachi, K.
N1 - Funding Information:
The author would like to express his appreciation to Shin Toyokawa, Takuya Wakabayashi, Hiroyuki Kobayashi, Suguro Maruyama and Masato Kobayashi for their helps in CNx coating preparation, water lubrication test and AFM, SEM observations. One of the authors (F. Zhou) also gratefully acknowledges the Japan Society for Promotion Science (JSPS) for giving him a post-doc fellowship.
PY - 2005/2
Y1 - 2005/2
N2 - Amorphous carbon nitride coatings (a-CNx) were deposited on SiC disk by ion beam assisted deposition (IBAD). The tribological behavior of a-CNx coating sliding against SiC ball in water was investigated and compared with that of SiC/SiC system at room temperature. The influences of testing conditions on friction coefficient and specific wear rate of both kinds of tribopairs were studied. The worn surfaces on disks were observed by scanning electron microscope (SEM). The results indicate that the running-in period of a-CNx/SiC was shorter than that of SiC/SiC system in water. At a sliding velocity of 120 mm/s, the mean steady-state friction coefficients of SiC/SiC (0.096) was higher than that of a-CNx/ SiC (0.05), while at 160 mm/s, lower friction coefficient (0.01) was obtained for SiC/SiC in water. With an increment of normal load, the mean steady-state friction coefficients after running-in first decreased, reaching a minimum value, and then increased. For self-mated SiC, the specific wear rate of SiC ball was a little higher than that of SiC disk, while for a-CNx/SiC, the specific wear rate of SiC ball were 10 times smaller than that of a-CNx coating. Furthermore, the specific wear rate of SiC ball sliding against a-CNx coating was reduced by a factor up to 100-1000 in comparison to that against SiC in water. The wear mechanism of SiC/SiC system in water is related to micro-fracture of ceramic and instability of tribochemical reaction layer. Conversely, wear mechanism for a-CNx/SiC is related to formation and transfer of easy-shear friction layer.
AB - Amorphous carbon nitride coatings (a-CNx) were deposited on SiC disk by ion beam assisted deposition (IBAD). The tribological behavior of a-CNx coating sliding against SiC ball in water was investigated and compared with that of SiC/SiC system at room temperature. The influences of testing conditions on friction coefficient and specific wear rate of both kinds of tribopairs were studied. The worn surfaces on disks were observed by scanning electron microscope (SEM). The results indicate that the running-in period of a-CNx/SiC was shorter than that of SiC/SiC system in water. At a sliding velocity of 120 mm/s, the mean steady-state friction coefficients of SiC/SiC (0.096) was higher than that of a-CNx/ SiC (0.05), while at 160 mm/s, lower friction coefficient (0.01) was obtained for SiC/SiC in water. With an increment of normal load, the mean steady-state friction coefficients after running-in first decreased, reaching a minimum value, and then increased. For self-mated SiC, the specific wear rate of SiC ball was a little higher than that of SiC disk, while for a-CNx/SiC, the specific wear rate of SiC ball were 10 times smaller than that of a-CNx coating. Furthermore, the specific wear rate of SiC ball sliding against a-CNx coating was reduced by a factor up to 100-1000 in comparison to that against SiC in water. The wear mechanism of SiC/SiC system in water is related to micro-fracture of ceramic and instability of tribochemical reaction layer. Conversely, wear mechanism for a-CNx/SiC is related to formation and transfer of easy-shear friction layer.
KW - Amorphous carbon nitride coatings
KW - Friction
KW - SiC ceramic
KW - Water lubrication
KW - Wear
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U2 - 10.1007/s11249-004-1771-x
DO - 10.1007/s11249-004-1771-x
M3 - Article
AN - SCOPUS:15044363604
SN - 1023-8883
VL - 18
SP - 153
EP - 163
JO - Tribology Letters
JF - Tribology Letters
IS - 2
ER -