The tribological properties and wear mechanism of copper coated graphite doped Sialon ceramic composites at wide range temperature from 25 to 800 °C

• Published in: Tribology international Vol. 123; pp. 10 - 16
• Main Authors: Sun, Qichun, Wang, Zixi, Yin, Bing, Yang, Jun, Liu, Jiongjie, Liu, Yulin, Cheng, Jun, Zhu, Shengyu, Qiao, Zhuhui
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2018; Elsevier BV
• Subjects: Ceramic coatings; Coefficient of friction; Composite materials; Copper; Friction reduction; Graphite; Lubrication; Self lubrication; Sialon; Sialon matrix composite; Synergistic effect; Tribological properties; Tribology; Wear; Wear mechanisms; Wear rate; Wear resistance; Wide range temperature; Wide range temperature; Wear mechanisms; Sialon matrix composite; Tribological properties
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2018.03.002

High-performance Sialon composites with excellent tribological properties were successfully fabricated by doped copper coated graphite. Results showed that Sialons have an excellent wear resistance (wear rate at 10−6 mm3/Nm) at 25 °C. When the temperature increases to 200–600 °C, the wear rate of β-Sialon composites decreases about 5–10 times compared to S0. Especially for S2 (the content of copper coated graphite is 30 wt%) at 600 °C, the wear rate decreases by an order of magnitude and the friction coefficient is reduced to 0.5, which is 37.5% lower than S0. The self-lubrication mechanism of Sialons ascribed to the synergistic effect of graphite and copper at wide range temperature. •High-performance Sialons with excellent tribological properties were prepared.•Tribological property was improved distinctly by addition copper coated graphite.•The Sialons can achieve self-lubricity at wide range temperature from 25 to 600 °C.•The self-lubricity mechanism is that the synergistic effect of graphite and copper.