Abstract
The FeS solid lubricating coatings were prepared on the AISI 5140 steel by chemical bath deposition (CBD) coating technique at various temperatures from 30 to 90 °C. The influence of temperature on microstructure, microcracks, and tribological properties was characterized and studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive spectrometry (EDS). The results show that the coating mainly consists of FexSy (FeS, FeS2, and Fe1−xS), and has a chrysanthemum-shaped (CS) morphology composed of the FeS crystal petals. The CS particles nucleate at about 30 °C, rapidly grow and reach a peak thickness at about 50–70 °C, and finally disappear and are replaced by disordered thick petals at 90 °C. The wear resistance of the steel was improved obviously after introducing of FeS coatings, owing to that the coatings can provide better lubrication and improve the wear resistance.
Highlights
Gear transmission is one of the most important transmission methods in modern machinery because of its many attractive properties like high transmission efficiency, accurate and stable, high transmission power, and wide applicable speed range [1,2,3]
With the progress of technology and the development of gear transmission, the gear is developed toward high speed, heavy load, complex service environment, and high reliability [4]
The development of transmission systems has made gear materials to be upgraded in the direction of light weight, good wear resistance, good corrosion resistance, and economic efficiency [5]
Summary
Gear transmission is one of the most important transmission methods in modern machinery because of its many attractive properties like high transmission efficiency, accurate and stable, high transmission power, and wide applicable speed range [1,2,3]. With the progress of technology and the development of gear transmission, the gear is developed toward high speed, heavy load, complex service environment, and high reliability [4]. The primary failure mode of gears is wear, which is a gradual loss of surface materials because of the friction between the two contact gears [5,6]. The friction on the gear surfaces greatly affects the power loss and service life of the transmission system [7]. Unfavorable working environment, such as poor lubricity, can lead to rapid failure of the gears, seriously undermining the reliability of the transmission system [8]. About 1/3~1/2 of primary energy is consumed by friction, and about 70% of equipment failures are related to the wear failure of gears [9]
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