Title of article :
Bio-mimetic surface structuring of coating for tribological applications
Author/Authors :
Jiang، نويسنده , , Wenping and Malshe، نويسنده , , Ajay P. and Wu، نويسنده , , J.-H.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
7
From page :
7889
To page :
7895
Abstract :
A novel multilayered coating was developed for applications associated with friction reduction and wear resistance improvement. The nano-engineered coating integrates a soft lubricating layer, consisting of MoS2–PTFE, onto hard load-supporting layers, with controlled surface morphology (roughness and patterning) of cBN–TiN. The coating was synthesized by sequential procedures including electrostatic spray deposition of cBN particles with different average particle sizes, chemical vapor deposition of TiN, deposition of nano- and micro-sized MoS2 dispersed in PTFE, and curing. The effect of cBN particle size (with different combinations of particle size) and deposition parameters (specifically electrical voltage) on the cBN–TiN surface morphology were studied experimentally and optimized. SEM characterization of the as-synthesized cBN–TiN coating shows surface features similar to that of colocasia esculenta, with alternating nano- and micro-sized domes and “pockets”; the MoS2–PTFE top layer has MoS2 particles retained in the pockets by a basket structure formed during PTFE curing. Tribological and scratch tests were carried out for the as-prepared cBN–TiN and cBN–TiN/MoS2–PTFE multilayered coatings. Sliding test results demonstrate significantly lower friction coefficient for the multilayered coating, showing that the unique integration of soft lubricating layer and biomimetically structured hard layer can effectively improve tribological performance. It is suggested that lubrication at the frictional contacts was realized by continuous release of the lubricants, MoS2 and PTFE, from the pockets.
Keywords :
Bio-mimetic surface morphology , Particle coating , MoS2–PTFE , cBN–TiN , WEAR , Friction
Journal title :
Surface and Coatings Technology
Serial Year :
2007
Journal title :
Surface and Coatings Technology
Record number :
1816803
Link To Document :
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