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Plasma-Texturing Surface Treatment of Grey Cast Iron for Friction Reduction

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Abstract:

A new surface texturing technique, based on liquid plasma discharging in an aqueous electrolyte, is proposed to modify the surface morphology of grey cast iron. During the process, a grey cast iron sample serves as a cathode where the reduction of hydrogen from the aqueous electrolyte occurs and consequently plasma discharging is generated on the sample surface under applied high voltages (up to 480V). The formed hydrogen bubbles are exploded during the electrical discharging, leaving an irregular array of craters on the sample surface due to the high temperature and shockwaves of the plasma micro-arc discharging. After polishing the crater-like textured surface, surface roughness and oil retention are measured by a profilometer. Reciprocating tribotests are utilized to determine the coefficients of friction. The surface morphology of the polished and tested surface is studied by SEM. The same tests are also conducted for the cast iron with a cross-hatched surface. These two set of results are compared to determine the effects of the texturing and polishing on friction. The results show that the polishing of textured surface can decrease the roughness and coefficients of friction significantly at starved lubricating conditions. This method has potential to be applied on the cylinder bore surface of a cast iron liner for the internal combustion engine (ICE). By honing the textured bore surface, the friction between piston and cylinder bore is expected to decrease and the ICE efficiency to increase for environmental benefits.

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Periodical:

Defect and Diffusion Forum (Volume 400)

Pages:

82-90

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.400.82

Citation:

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Online since:

March 2020

Authors:

Wei Zha, Ran Cai, Jing Zeng Zhang, Xueyuan Nie*

Keywords:

Cast Iron, Friction, Plasma Treatment, Surface Texturing

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* - Corresponding Author

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