Abstract
The aim of this paper is to find an effective way to reduce the friction and wear of steel. CrCN coating was deposited on AISI 304 stainless steel by magnetron sputtering technology, and the friction and wear properties of the coating under glycerol lubrication were studied. The hardness of CrCN coatings on stainless steel surface can reach to 17.87 GPa when the carbon target deposition current is 2A. The CrCN coating presents low friction coefficient (COF) under the lubrication of glycerol, a highly efficient green lubricant. When the load is 0.5 N, the lowest friction coefficient is only 0.01. XPS analysis on the wear track suggested that glycerol decomposed during sliding and a fluid lubricating layer was formed, which provides ultralow friction. The paper shows that the glycerol could be used as an efficient lubricant for the CrCN coating.
Highlights
In recent years, with the continuous advancement and development of PVD coating technology, binary metal hard nitride films have been widely used in the fields of cutting tools, automotive manufacturing, shipbuilding, and aerospace, and studied because of their excellent mechanical properties and wear resistance
Kabir et al found that the incorporation of Ti can effectively block the growth of CrN columnar crystals and reduce the grain size, which led to the higher hardness of the CrN coating [9]
Tan et al reported that Si and Cu elements can inhibit the growth of columnar crystals in CrN coatings, refine crystal grains, and generate nanocrystalline structures [11]
Summary
With the continuous advancement and development of PVD coating technology, binary metal hard nitride films have been widely used in the fields of cutting tools, automotive manufacturing, shipbuilding, and aerospace, and studied because of their excellent mechanical properties and wear resistance. It was found that the doping of non-metallic carbon (C) element can effectively hinder the growth of large grains of CrN by changing the crystal structure of CrN coating, showing more outstanding mechanical and tribological. Wang et al studied the tribological properties of CrCN under water lubrication conditions and found that the friction coefficient can reach as low as 0.2 [19]. Previous studies have shown that a variety of materials show a low friction and wear under glycerol lubrication [25,26,27,28,29,30] It is, interesting to investigate the compatibility of glycerol with CrCN coating. In this paper, glycerol was used to improve the friction and wear properties of the CrCN coating, and its lubrication mechanism is analyzed
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