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Title: In-situ tribochemical formation of self-lubricating diamond-like carbon films

Abstract

For this study, diamond-like carbon (DLC) films were tribochemically formed from ambient hydrocarbons on the surface of a highly stable nanocrystalline Pt-Au alloy. A sliding contact between an alumina sphere and Pt-Au coated steel exhibited friction coefficients as low as μ = 0.01 after dry sliding in environments containing trace (ppb) organics. Ex situ analysis indicated that the change in friction coefficient was due to the formation of amorphous carbon films, and Raman spectroscopy and elastic recoil analysis showed that these films consist of sp 2/sp 3 amorphous carbon with as much as 20% hydrogen. Transmission electron microscopy indicated these films had thicknesses exceeding 100 nm, and were enhanced by the incorporation of worn Pt-Au nanoparticles. The result was highly wear-resistant, low-friction DLC/Pt-Au nanocomposites. Atomistic simulations of hydrocarbons under shear between rigid Pt slabs using a reactive force field showed stress-induced changes in bonding through chain scission, a likely route towards the formation of these coatings. This novel demonstration of in situ tribochemical formation of self-lubricating films has significant impact potential in a wide range of engineering applications.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials, Physical, and Chemical Sciences Center
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1440393
Alternate Identifier(s):
OSTI ID: 1472253
Report Number(s):
SAND2018-9551J
Journal ID: ISSN 0008-6223; 667477
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Journal Article: Published Article
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 138; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; DLC; Diamond-like carbon; Hydrocarbons; In situ; Low friction; Tribochemistry

Citation Formats

Argibay, Nicolas, Babuska, Tomas Farley, Curry, John F., Dugger, Michael T., Lu, Ping, Adams, David P., Nation, Brendan L., Doyle, Barney L., Pham, Minh, Pimentel, Adam S., Mowry, Curtis D., Hinkle, Adam R., and Chandross, Michael E. In-situ tribochemical formation of self-lubricating diamond-like carbon films. United States: N. p., 2018. Web. doi:10.1016/j.carbon.2018.06.006.
Argibay, Nicolas, Babuska, Tomas Farley, Curry, John F., Dugger, Michael T., Lu, Ping, Adams, David P., Nation, Brendan L., Doyle, Barney L., Pham, Minh, Pimentel, Adam S., Mowry, Curtis D., Hinkle, Adam R., & Chandross, Michael E. In-situ tribochemical formation of self-lubricating diamond-like carbon films. United States. doi:10.1016/j.carbon.2018.06.006.
Argibay, Nicolas, Babuska, Tomas Farley, Curry, John F., Dugger, Michael T., Lu, Ping, Adams, David P., Nation, Brendan L., Doyle, Barney L., Pham, Minh, Pimentel, Adam S., Mowry, Curtis D., Hinkle, Adam R., and Chandross, Michael E. Tue . "In-situ tribochemical formation of self-lubricating diamond-like carbon films". United States. doi:10.1016/j.carbon.2018.06.006.
@article{osti_1440393,
title = {In-situ tribochemical formation of self-lubricating diamond-like carbon films},
author = {Argibay, Nicolas and Babuska, Tomas Farley and Curry, John F. and Dugger, Michael T. and Lu, Ping and Adams, David P. and Nation, Brendan L. and Doyle, Barney L. and Pham, Minh and Pimentel, Adam S. and Mowry, Curtis D. and Hinkle, Adam R. and Chandross, Michael E.},
abstractNote = {For this study, diamond-like carbon (DLC) films were tribochemically formed from ambient hydrocarbons on the surface of a highly stable nanocrystalline Pt-Au alloy. A sliding contact between an alumina sphere and Pt-Au coated steel exhibited friction coefficients as low as μ = 0.01 after dry sliding in environments containing trace (ppb) organics. Ex situ analysis indicated that the change in friction coefficient was due to the formation of amorphous carbon films, and Raman spectroscopy and elastic recoil analysis showed that these films consist of sp2/sp3 amorphous carbon with as much as 20% hydrogen. Transmission electron microscopy indicated these films had thicknesses exceeding 100 nm, and were enhanced by the incorporation of worn Pt-Au nanoparticles. The result was highly wear-resistant, low-friction DLC/Pt-Au nanocomposites. Atomistic simulations of hydrocarbons under shear between rigid Pt slabs using a reactive force field showed stress-induced changes in bonding through chain scission, a likely route towards the formation of these coatings. This novel demonstration of in situ tribochemical formation of self-lubricating films has significant impact potential in a wide range of engineering applications.},
doi = {10.1016/j.carbon.2018.06.006},
journal = {Carbon},
number = C,
volume = 138,
place = {United States},
year = {Tue Jun 05 00:00:00 EDT 2018},
month = {Tue Jun 05 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.carbon.2018.06.006

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