Cold Spraying: A New Alternative Preparation Method for Nickel-Based High-Temperature Solid-Lubrication Coating
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Cold Spraying: A New Alternative Preparation Method for Nickel-Based High-Temperature Solid-Lubrication Coating Jie Chen1 • Hui Song2,3 • Guang Liu1 • Bing Ma1 • Yulong An3 • Li Jia1
Submitted: 27 October 2019 / in revised form: 8 June 2020 / Accepted: 18 June 2020 Ó ASM International 2020
Abstract Cold spraying was first used for the purpose of preparing nickel-based high-temperature lubrication coatings. High-quality In625-Cr2O3-Ag composite coatings were deposited by a high-pressure cold-spray system, and their tribological properties were evaluated at 20 and 1000 °C by a high-temperature tribometer. The microstructure, composition, and wear mechanisms of the coatings were analyzed by x-ray diffraction, scanning electron microscopy, and Raman spectroscopy. The measurements showed that the cold-sprayed In625-Cr2O3-Ag composite coatings have a very dense structure, good bonding strength to substrate, low friction coefficient, and excellent wear resistance. The friction coefficients of the In625-Cr2O3-Ag coatings were around 0.3 and the wear rates of the coating were maintained at about 10-5 mm3/ N m at 20 and 1000 °C. The experimental observation of the wear tracks revealed that the silver provided lubrication at 20 °C. As the temperature increased up to 1000 °C, a lubrication layer with low shear strength made up of Ag2MoO4 and Cr2O3 was formed on the wear track.
& Jie Chen [email protected] Hui Song [email protected] 1
Inner Mongolia Metallic Materials Research Institute, Ningbo 315103, China
2
Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Keywords cold spraying composite coating high temperature Ni-based coating self-lubricating coating wear-resistant coating
Introduction The rapid development of modern manufacturing urgently requires high-temperature solid-lubricating materials. Such material is capable of maintaining low friction and wear for hightemperature industrial components, such as air foil bearings, gas turbine sealing, and internal combustion engines (Ref 1-3). As these components often start from room temperature to elevated temperature, a stable performance of a good self-lubricating and a high wear resistance are required in the entire range of temperature to ensure working efficiency and reliability (Ref 4, 5). Thus, hightemperature lubrication coatings with effective lubricity in a wide temperature range have been extensively researched over recent decades. The most representative high-temperature lubrication coating is the PS series of PS100, PS200, PS300, and PS400 developed by NASA (Ref 6-8). PS series coatings were deposited by a plasma-spraying method, in which a Ni-based alloy was used as the matrix material, such as NiCr for PS100, NiAlCo for PS200, and NiMoAl for PS400. Cr2O3 or Cr3C2 acted a
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