Abstract
Improving the tribological performance of M50 steel under the conditions of wide load range is of great significance. In this study, the interfacial structure of surface micropores filled with Sn–Ag–Cu or Sn–Ag–Cu/whisker carbon nanotubes (whiskerCNT) of M50 material was prepared by laser additive manufacturing and high-temperature infiltration. From 2 to 22 N, the lubrication characteristics of Sn–Ag–Cu and whiskerCNT in surface micropores of M50 was investigated. Results indicate that Sn–Ag–Cu can precipitate to the worn surface and form a lubricating layer, which has a good lubricating effect. Moreover, the flow behavior of Sn–Ag–Cu on a worn surface can play the role of crack healing. At higher load, the strength of the lubricating film is enhanced by whiskerCNT, which renders the lubricating film not vulnerable to premature rupture.
Highlights
M50 steel material has excellent thermal stability and anti-fatigue properties, and it is one of the main raw materials for manufacturing aviation spindle bearings [1,2,3]
Shi et al [7] thoroughly investigated the impact of solid lubricant MoS2 on M50 friction properties at different temperatures, where the generation of the lubricating film containing the lubricant MoS2 was one of the main factors of the excellent lubricating properties of M50
The cooperative lubrication behavior of Sn–Ag–Cu and whiskerCNT in surface micropores was investigated using ball-on-disc tests from 2 N to 22 N under conditions characterized by a temperature of 350 ◦ C and a sliding speed of 0.2 m/s
Summary
M50 steel material has excellent thermal stability and anti-fatigue properties, and it is one of the main raw materials for manufacturing aviation spindle bearings [1,2,3]. Shi et al [7] thoroughly investigated the impact of solid lubricant MoS2 on M50 friction properties at different temperatures, where the generation of the lubricating film containing the lubricant MoS2 was one of the main factors of the excellent lubricating properties of M50. If the temperature was too high, the structure of MoS2 as destroyed, and the lubricating effect was reduced. Researchers found that layered lubricant Ti3 SiC2 can play a lubricating role in high-temperature conditions, as well as reduce the friction coefficient of M50 material [8], but this lubrication effect was not obvious in the middleand low-temperature states. A single solid lubricant struggles to prevent the M50 material from having outstanding friction and wear characteristics in a wide load range or temperature range. The enhancement effects of mixed lubricants TiO2 and graphene nanomaterials in terms of
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