The Relation of Hertzian Contact Pressure to Friction Behavior of Self-Lubricating Boric Acid Films

Conference · Fri Feb 01 04:00:00 EST 1991

OSTI ID:5882332

Erdemir, A. ^[1]; Erck, R. A. ^[1]; Robles, J. ^[2]

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1. Argonne National Laboratory (ANL), Argonne, IL (United States)
2. Univ. of California, Davis, CA (United States)

The effect of Hertzian contact pressure on the friction coefficient of self lubricating boric acid (H₃BO₃) films was investigated by sliding steel and ceramic balls against boric oxide (B₂O₃) coated steel and ceramic disks under a wide range of contact loads. Self-lubricating H₃BO₃ films result from a spontaneous chemical reaction between water molecules and B₂O₃ coatings in humid air. Mean initial Hertzian contact pressures in the range of 0.3 to 1.6 GPa, were created between balls and B₂O₃-coated disks by varying applied load and the radius of balls. It was demonstrated that an inverse relation exists between friction coefficient and Hertzian contact pressure. Using the Hertzian contact model, the shear strength of H₃BO₃ films was estimated to be approximately 22.9 MPa, which is comparable to that of MoS₂, reported as 24.8 MPa.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5882332
• Report Number(s): ANL/CP--72642; CONF-9104187--2; ON: DE91010592
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
BORIC ACID
CERAMICS
CHALCOGENIDES
FILMS
FRICTION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INTERFACES
LUBRICATING PROPERTIES
MATHEMATICS
MECHANICAL PROPERTIES
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
PRESSURE EFFECTS
REFRACTORY METAL COMPOUNDS
REGRESSION ANALYSIS
SHEAR PROPERTIES
SLIDING FRICTION
STATIC LOADS
STATISTICS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS