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Coatings Tribology

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Tribology for Scientists and Engineers

Abstract

Optimization of coefficient of friction in association with minimum wear is a general requirement to reduce energy consumption due to friction and wear losses. Lubrication such as solid and liquid is utilized to meet low friction and wear demands. Extreme environmental conditions such as space and high-temperature applications limit their usefulness. There is a need to design newer class of coatings for such applications. Design and selection parameters of coatings and their tribology are discussed in this chapter. These parameters include scale-dependent failure modes (nano- and micrometer length scale), state of stress at the interface, material properties, and chemical interactions at the interface. The requirements for selection of coating for friction applications are included. Tribology of low-friction coatings such as graphite, molybdenum disulfide, diamond-like carbon, chromium-based coatings, and polymeric coatings is discussed. Effects for service conditions such as load, nitrogen, humidity, and temperature for selected coatings are listed. Knowledge of the interfacial phenomena plays very important role in selection and development of coatings for tribological applications.

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Authors and Affiliations

  1. Curt G. Joa Inc, Sheboygan Falls, WI, 53085-0903, USA

    Sudeep P. Ingole Ph.D.

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  1. Sudeep P. Ingole Ph.D.
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Correspondence to Sudeep P. Ingole Ph.D. .

Editor information

Editors and Affiliations

  1. Department of Industrial Engineering, University of Wisconsin, Milwaukee, Wisconsin, USA

    Pradeep L. Menezes

  2. Department of Mechanical Engineering, University of Wisconsin, Milwaukee, Wisconsin, USA

    Michael Nosonovsky

  3. Department of Marine Engineering, Texas A&M University, Galveston, Texas, USA

    Sudeep P. Ingole

  4. Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India

    Satish V. Kailas

  5. Department of Industrial Engineering, University of Wisconsin, Milwaukee, Wisconsin, USA

    Michael R. Lovell

Exercise

Exercise

  1. 1.

    Describe different applications where friction coatings are used.

  2. 2.

    What are the design requirements for the friction coatings?

  3. 3.

    What factors affect the decision making of surface treatment to develop friction surfaces?

  4. 4.

    What are the advantages of friction surfaces?

  5. 5.

    What parameters govern the process of coating design? Briefly describe each.

  6. 6.

    What is the influence of environmental parameters on friction of graphite?

  7. 7.

    What is the influence of environmental parameters on friction of MoS2?

  8. 8.

    What are the advantages of the polymeric friction coatings?

  9. 9.

    For alumina deposited on the cemented carbide, find the critical thickness using the relationship given below. cd = 2 μm, νf = 0.25, Ef = 400 GPa, and σR = 1 GPa:

    $$ \frac{t_b}{c_d}={\left[\frac{12\left(1-{v}_f^2\right){\sigma}_R}{\pi^2{E}_f}\right]}^{\frac{1}{2}} $$

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Ingole, S.P. (2013). Coatings Tribology. In: Menezes, P., Nosonovsky, M., Ingole, S., Kailas, S., Lovell, M. (eds) Tribology for Scientists and Engineers. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1945-7_9

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