Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 3
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Elastomers, in general, have poor resistance to abrasion. Damage to an elastomer
due to abrasion can reduce seal life (Parker Hannifin 1999). Poor surface finish of the
mating part is a common failure mechanism in seals (Electric Power Research Institute
Guide to optimized replacement of equipment seals 1990). Good lubrication, particularly
during installation, can reduce abrasion and improve seal life. In dynamic seals, friction is
also a major consideration. Seals and mating surfaces must be properly selected and
maintained to reduce friction. Again, good lubrication is important. (Parker Hannifin
Surface engineering is the application of a thin film or coating to a substrate. A
number of different industries use surface engineering as a common method of dealing
with surface limitations (Bunshah 1994). One of the advantages of surface engineering is
the ability to affect surface properties such as adhesion, friction, and galling without
affecting bulk properties such as strength, hardness, and elasticity (Hopkins, Black, and
Harrington 1997). TXU has developed surface engineering technology using a vacuum
coating process. This process, now marketed as PlasmaBond, has successfully applied a
thin metal coating to metal surfaces. This thin coating acts as a dry film lubricant that
reduces the potential for galling and reduces friction. Although the development of the
TXU process has been focused on metallic parts, this process can be used to coat non-
metallic items such as plastics and elastomers (Hopkins, Black, and Harrington 1997).
The problem addressed in this research is valve stem leakage through an
elastomeric O-ring seal. The valve used in this research is a carbon steel, pressure class
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Taylor, John Abner. Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage, thesis, December 2000; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc2690/m1/11/: accessed January 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .