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FRICTION PERFORMANCE OF COATINGS

D. M. Pai, B. Kailasshankar, M. S. Konchady, X. Wang J. Mason, J. Sankar, and S. N. Yarmolenko

Center for Advanced Materials and Smart Structures NC A&T University Greensboro, NC 27411

Introduction Coatings are thin layers of materials that are deposited onto a bulk material to achieve properties not easily attainable with substrate alone. They have attracted considerable research interest because of their numerous technical applications. Coatings are used widely in optical, microelectronic, packaging and decorative applications as they impart good mechanical, chemical, electrical, magnetic and optical properties1. Friction and wear properties are a critical issue for the manufacturing industry and hence characterization of friction and wear properties is important in assessing the potential of coating materials. Friction and wear properties of coatings are traditionally measured in industries using tribometer. The tribometer employs one of the standard configurations such as ball-on-disc, ring-on-disc, pin-on-disc and pin-on-block to reproduce the motion typical of many real world mechanisms. The technique is well suited for monolithic materials as well as thick coatings. However, friction and wear phenomena are essentially the outcome of surface interactions and these properties are affected by surface geometry, material and environmental conditions especially for thin coatings.

Generating mechanical property profiles as a function of depth and performing varying load tests provide additional insight in characterizing adhesion as well as wear resistance of thin coatings. The Nano Indenter is a specialized piece of mechanical characterization equipment well suited for this purpose. In the present experiment, thin and thick coatings produced on low carbon steel using dip-impregnation technique are characterized by both tribometer and Nano Indenter.

In our case, the friction test procedures are demonstrated on two types of materials listed below. The test materials are not a limiting factor, as any pair of untreated and treated specimens can be used. 1. SAE 1018 ground steel bars of 9.5 mm square cut into approximately 25 mm lengths. Hardening was achieved by zinc phosphating followed by impregnated with chrome oxide aqueous solution and fired at elevated temperature and furnace cooled. The impregnation and firing cycles were repeated for multiple cycles. 2. Silicon wafers coated with alumina thin films of ~600 nm thickness produced by pulsed laser deposition.

Proceedings of the 2005 American Society for Engineering Education Annual Conference & Exposition Copyright © 2005, American Society for Engineering Education

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Wang, X., & Konchady, M., & Mason, J., & Sankar, J., & Yarmolenko, S., & Kailasshankar, B., & Pai, D. (2005, June), Friction Performance Of Coatings Paper presented at 2005 Annual Conference, Portland, Oregon. 10.18260/1-2--14853