TY - JOUR
T1 - High toughness integrated with self-lubricity of Cu-doped Sialon ceramics at elevated temperature
AU - Sun, Qichun
AU - Yang, Jun
AU - Yin, Bing
AU - Cheng, Jun
AU - Zhu, Shengyu
AU - Wang, Shuai
AU - Yu, Yuan
AU - Qiao, Zhuhui
AU - Liu, Weimin
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/7
Y1 - 2018/7
N2 - High toughness integrated with self-lubricity of β-Sialon composites at elevated temperature containing second phase particles were successfully fabricated. It was found that the fracture toughness can be substantially improved by addition of Cu powder. The fracture toughness can be reached 6.75 MPa m1/2 and 4.42 MPa m1/2 at 25 and 900 °C, respectively. Meanwhile, the tribological properties of Cu-doped Sialons have a tremendous improvement at high temperature. Especially when the content of Cu powder is above 10 wt%, the wear rate decreases by two orders of magnitude and the friction coefficient reduces to 0.56–0.65 at 900 °C. In addition, the microstructure of composites was characterized, and crack propagation behavior and tribological behavior were discussed to clarify the toughening mechanisms and self-lubrication mechanisms. The results show that the principal toughening mechanisms are crack deflection and crack bridging. The tribo-chemical reaction and generated CuO films with lubricity are the main self-lubrication mechanisms.
AB - High toughness integrated with self-lubricity of β-Sialon composites at elevated temperature containing second phase particles were successfully fabricated. It was found that the fracture toughness can be substantially improved by addition of Cu powder. The fracture toughness can be reached 6.75 MPa m1/2 and 4.42 MPa m1/2 at 25 and 900 °C, respectively. Meanwhile, the tribological properties of Cu-doped Sialons have a tremendous improvement at high temperature. Especially when the content of Cu powder is above 10 wt%, the wear rate decreases by two orders of magnitude and the friction coefficient reduces to 0.56–0.65 at 900 °C. In addition, the microstructure of composites was characterized, and crack propagation behavior and tribological behavior were discussed to clarify the toughening mechanisms and self-lubrication mechanisms. The results show that the principal toughening mechanisms are crack deflection and crack bridging. The tribo-chemical reaction and generated CuO films with lubricity are the main self-lubrication mechanisms.
KW - Dry sliding
KW - Elevated temperature
KW - Self-lubrication mechanisms
KW - Sialon matrix composite
KW - Toughening mechanisms
UR - http://www.scopus.com/inward/record.url?scp=85042943283&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2018.01.042
DO - 10.1016/j.jeurceramsoc.2018.01.042
M3 - 文章
AN - SCOPUS:85042943283
SN - 0955-2219
VL - 38
SP - 2708
EP - 2715
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 7
ER -