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6CCVD Research

Size Dependence of Nanoscale Wear of Silicon Carbide

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2016-12-20
JournalACS Applied Materials & Interfaces
AuthorsChaiyapat Tangpatjaroen, David S. Grierson, Steven Shannon, Joseph E. Jakes, Izabela Szlufarska
InstitutionsForest Products Laboratory, University of Wisconsinā€“Madison
Citations26

Abstract

Section titled ā€œAbstractā€

Nanoscale, single-asperity wear of single-crystal silicon carbide (sc-SiC) and nanocrystalline silicon carbide (nc-SiC) is investigated using single-crystal diamond nanoindenter tips and nanocrystalline diamond atomic force microscopy (AFM) tips under dry conditions, and the wear behavior is compared to that of single-crystal silicon with both thin and thick native oxide layers. We discovered a transition in the relative wear resistance of the SiC samples compared to that of Si as a function of contact size. With larger nanoindenter tips (tip radius ā‰ˆ 370 nm), the wear resistances of both sc-SiC and nc-SiC are higher than that of Si. This result is expected from the Archardā€™s equation because SiC is harder than Si. However, with the smaller AFM tips (tip radius ā‰ˆ 20 nm), the wear resistances of sc-SiC and nc-SiC are lower than that of Si, despite the fact that the contact pressures are comparable to those applied with the nanoindenter tips, and the plastic zones are well-developed in both sets of wear experiments. We attribute the decrease in the relative wear resistance of SiC compared to that of Si to a transition from a wear regime dominated by the materialsā€™ resistance to plastic deformation (i.e., hardness) to a regime dominated by the materialsā€™ resistance to interfacial shear. This conclusion is supported by our AFM studies of wearless friction, which reveal that the interfacial shear strength of SiC is higher than that of Si. The contributions of surface roughness and surface chemistry to differences in interfacial shear strength are also discussed.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2008 - Tribology on the Small Scale: A Bottom Up Approach to Friction, Lubrication, and Wear

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