I am looking for general explanation on how nano particle can reduce surface friction when used as coating on stainless steel surface
Dear Abdullah,
I think uou need to get more specific regarding the coating system, composition and thickness for other to help you.
Dear Harpreet, thank you for your response. What I am trying to understand is the general mechanism on how nano-particle may contribute to surface friction reduction when used a coating. For example, Al2O3 nano particle used as coating on stainless steel surface, coating thickness in range of 5-10nm.
Dear Abdullah,
There could be multiple mechanisms. One hypothesis could be that these nanoparticles can sit in the asperities for surfaces with roughness in the range of a few microns, thereby reducing the effective roughness.
Dear Abdullah,
There may be also some positive rolling of particles in nano-grooves parallel to the sliding direction. The article below may be of interest to you:
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 2, March - April (2013) ,
"MICROSTRUCTURE AND TRIBOLOGICAL PROPERTIES OFNANOPARTICULATE WC/AL METAL MATRIX COMPOSITES" by Amarnath.G and K.V. Sharma
Good luck!
Luiza
Dr. Jamaluddin,
Al₂O₃ is an abrasive nanoparticle. Nanocoatings are not somehow "intelligent" and able to decide exactly where they will go on the surface (i.e., just in the asperity valleys). Nanocoatings will simply follow the existing surface contours of your stainless steel substrate.
If you coat the existing asperities on each interacting surface in Al₂O₃ abrasive, you will only make harder asperities. If your abrasive Al₂O₃ nanoparticles are suspended in a liquid lubricant, you may achieve in-situ nanopolishing of the asperities, resulting in a lower Ra (Roughness Average) and a correspondingly lower CoF.
I see that this post is from 2014, but my response is provided now for anyone else that comes upon your question with similar intentions.
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