Tribological behaviors of diamond films and their applications in metal drawing production in water-lubricating condition

The frictional and wear performance of the microcrystalline diamond (MCD), nanocrystalline diamond (NCD) and MCD/diamond-like carbon (DLC) bi-layered film are comparatively investigated under water-lubricating conditions. A full factorial experimental plan is conducted with four sliding velocities r...

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Veröffentlicht in:Proceedings of the Institution of Mechanical Engineers. Part J, Journal of engineering tribology Journal of engineering tribology, 2016-06, Vol.230 (6), p.656-666
Hauptverfasser: Chen, Sulin, Shen, Bin, Sun, Fanghong, Zhang, Zhiming, Guo, Songshou
Format: Artikel
Sprache:eng
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Zusammenfassung:The frictional and wear performance of the microcrystalline diamond (MCD), nanocrystalline diamond (NCD) and MCD/diamond-like carbon (DLC) bi-layered film are comparatively investigated under water-lubricating conditions. A full factorial experimental plan is conducted with four sliding velocities ranging from 0.126 to 0.503 m/s and four normal loads from 2 to 8 N. The duration of each sliding process is 24 h. The results show that although the MCD/DLC film shows the lowest stable coefficient of friction ranging from 0.025 to 0.12, the top-layered DLC film does not show beneficial effect on enhancing the sliding stability of single-layered diamond films. Comparatively, the MCD film exhibits the superior sliding stability and wear resistance, which are regarded as the more critical characters that determinate the lifetime and performance of a metal drawing die. Therefore, a drawing production of aluminum pipes is conducted in the water-lubricating condition using the MCD-coated drawing die. A novel drawing device is designed for the water-lubricating metal drawing production. It is capable of providing a fully immersed drawing environment for the metal pipe and thus guarantee the lubrication and cooling effects. The result of the drawing production shows that utilizing the diamond-coated drawing die in the water-lubricating condition could elevate the production of a drawing die by over 100 times compared with using the tungsten carbide drawing dies in oil-lubricating condition. Moreover, good surface quality and geometrical precision could also be obtained by the diamond-coated drawing dies in the water-lubricating drawing.
ISSN:1350-6501
2041-305X
DOI:10.1177/1350650115611154