Tribological properties of laser cladding NiAl intermetallic compound coatings at elevated temperatures. (December 2016)

• Record Type: Journal Article
• Authors: Yu, Youjun; Zhou, Jiansong; Ren, Shufang; Wang, Lingqian; Xin, Benbin; Cao, Silong
• Is Part Of: Tribology international. Volume 104(2016)
• Page Start: 321
• Page End: 327
• Publication Date: 2016-12
• Subjects: NiAl intermetallics coating -- Laser cladding -- Tribological properties -- Wear mechanism; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2016.09.014
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Tribological properties, phase compositions and wear mechanisms of laser cladding NiAl coating were investigated from room temperature to 1000 °C under air atmosphere environment. The results showed that a glaze layer composed of NiO, Ni2 O3, Al2 O3 and NiAl2 O4 phases as well as Ni3 Al phase were formed on worn surface under high temperature, which act as a solid lubricant and anti-wear material improving the tribological properties of NiAl coating at elevated temperatures. The wear mechanism is dominated by abrasive wear below 500 °C, and transforms to plastic deformation and adhesive wear at 500 °C up to 700 °C and oxidation wear at 900 °C and above, owing to formation of new oxide phase during tribochemical reaction. Highlights: Tribological properties of laser cladding NiAl intermetallic compound coating were investigated at elevated temperatures. The glaze layer acts as a wear-resistant solid lubricant to reduce the friction and wear of laser cladding NiAl coating. The wear mechanism is abrasive wear below 500 °C, and transforms to adhesive wear and oxidation wear at 500 °C and above.