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A Mechanism for Mechanochemical Wear of Model Systems: Nano-Tribology Studies of Carbonate and Phosphate Single Crystal Surfaces in Aqueous Media

Published online by Cambridge University Press:  02 July 2020

J.T. Dickinson ,
L. Scudiero ,
N.S. Park ,
M.W. Kim  and
S.C. Langford
J.T. Dickinson
Affiliation:
Department of Physics and Materials Science Program Washington State University, Pullman, WA99164-2814USA
L. Scudiero
Affiliation:
Department of Physics and Materials Science Program Washington State University, Pullman, WA99164-2814USA
N.S. Park
Affiliation:
Department of Physics and Materials Science Program Washington State University, Pullman, WA99164-2814USA
M.W. Kim
Affiliation:
Department of Physics and Materials Science Program Washington State University, Pullman, WA99164-2814USA
S.C. Langford
Affiliation:
Department of Physics and Materials Science Program Washington State University, Pullman, WA99164-2814USA
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Extract

In several mechanical wear situations, e.g., those involving biomaterials and applications of mechanochemical polishing, a surface experiences simultaneous tribological loading and corrosive chemical exposure; the combination can greatly increase wear rates. We examine the exposure of single crystal calcite [CaCO3], dolomite [MgCa(CO3)2], and brushite[CaHPO4.2H2O] to buffered aqueous solutions and mechanical stimulation with an Scanning Force Microscope (SFM) tip. Silicon nitride tips are used with applied normal loads from 0-300 nN, tip radii ∼30 nm and tip velocities from 1-200 μm/s. We present the influence of normal force, tip velocity, and solution chemistry on the rates of corrosive wear of calcite and dolomite. Images of the wear of atomic steps can be used to examine the wear rates and propagation of dissolution around the stimulated region. Mechanical stimulation includes small area scans, linear reciprocation, and indentation. A diagram of wear by linear reciprocation of the SFM tip and typical results on single crystal calcite are shown in Figs. 1 and 2, respectively.

Type
Scanned Probe Microscopies: Technologies, Methodologies, and Applications
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 1283 - 1284
Copyright
Copyright © Microscopy Society of America 1997

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References

1. Martinez, M.A., Solid State Technology 37, 26 (1994).Google Scholar

2. Park, N.-S., Kim, M.-W., Langford, S.C., and Dickinson, J.T., Langmuir 12, 4599–4604 (1996).CrossRefGoogle Scholar

3. Park, N.-S., Kim, M.-W., Langford, S.C., and Dickinson, J.T., J. Appl. Phys. 80, 2680–2686 (1996).CrossRefGoogle Scholar

4. This work supported by the National Science Foundation Surface Engineering and Tribology ProgramGoogle Scholar.