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The boron oxide–boric acid system: Nanoscale mechanical and wear properties

Published online by Cambridge University Press:  31 January 2011

Xiangdong Ma ,
W. N. Unertl  and
A. Erdemir
Xiangdong Ma
Affiliation:
Laboratory for Surface Science and Technology, University of Maine, Orono, Maine 04469
W. N. Unertl*
Affiliation:
Laboratory for Surface Science and Technology, University of Maine, Orono, Maine 04469
A. Erdemir
Affiliation:
Argonne National Laboratory, Energy Technology Division, Argonne, Illinois 60439
*
b) Address all correspondence to this author. unertl@maine.edu
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Abstract

The film that forms spontaneously when boron oxide (B2O3) is exposed to humid air is a solid lubricant. This film is usually assumed to be boric acid (H3BO3), the stable bulk phase. We describe the nanometer-scale surface morphology, mechanical properties, and tribological properties of these films and compare them with crystals precipitated from saturated solutions of boric acid. Scanning force microscopy (SFM) and low-load indentation were the primary experimental tools. Mechanical properties and their variation with depth are reported. In all cases, the surfaces were covered with a layer that has different mechanical properties than the underlying bulk. The films formed on boron oxide showed no evidence of crystalline structure. A thin surface layer was rapidly removed, followed by slower wear of the underlying film. The thickness of this initial layer was sensitive to sample preparation conditions, including humidity. Friction on the worn surface was lower than on the as-formed surface in all cases. In contrast, the SFM tip was unable to cause any wear to the surface film on the precipitated crystals. Indentation pop-in features were common for precipitated crystals but did not occur on the films formed on boron oxide. The surface structures were more complex than assumed in models put forth previously to explain the mechanism of lubricity in the boron oxide–boric acid–water system.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 8 , August 1999 , pp. 3455 - 3466
Copyright
Copyright © Materials Research Society 1999

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