Effect of Ag2Mo2O7 Incorporation on the Tribological Characteristics of Adaptive Ni-Based Composite at Elevated Temperatures

• Published in: Tribology transactions Vol. 56; no. 3; pp. 469 - 479
• Main Authors: Liu, Er-Yong, Gao, Yi-Min, Wang, Wen-Zhen, Zhang, Xiao-Liang, Wang, Xiu, Yi, Ge-Wen, Jia, Jun-Hong
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.05.2013; Taylor & Francis
• Subjects: Applied sciences; Coefficient of friction; Contact of materials. Friction. Wear; Exact sciences and technology; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Raman; Self-Lubricated Wear; Self-Lubricating Composites; Solid Lubrication Friction; Nickel base alloys; Pin on disk machine; Metal matrix composite; Inconel; High temperature; Wear mechanisms; Surface analysis; Powder metallurgy; X ray diffraction; Composite material; Silver Molybdates; Friction; Transition metal alloy; Sintering; Wear; Self-Lubricating Composites; Raman; Microstructure; Self lubricating material; Self-Lubricated Wear; Solid Lubrication Friction
• ISSN: 1040-2004; 1547-397X
• DOI: 10.1080/10402004.2012.763004

A high-temperature self-lubricating Ni-based composite was prepared with the addition of Ag 2 Mo 2 O 7 by a powder metallurgy technique. X-ray diffraction (XRD) analysis showed that Ag 2 Mo 2 O 7 decomposed to Ag and MoO 3 during the sintering process. The tribological properties of Ni-based composites were evaluated, and the effects of Ag 2 Mo 2 O 7 incorporation on the friction and wear characteristics of composites were analyzed. The results showed that the tribological properties of Ni-based composite deteriorated with increasing temperature, and the addition of Ag 2 Mo 2 O 7 decreased the coefficient of friction and wear rate of Ni-based composite at medium and high temperatures. The coefficient of friction and wear rate of composite containing 20 wt% Ag 2 Mo 2 O 7 were lowered to 0.33 and 1.51 × 10 −5 mm 3 N −1 m −1 , respectively. The wear mechanism was characterized by plastic deformation and delamination. In addition, the improvement of tribological properties of the Ni-based composite at high temperatures is attributed to synergistic lubricating effect of silver molybdate (reproduce in the rubbing process at high temperatures) and iron oxide (transfer from disk material to the pin).