December 2016

Maintenance and Reliability

Buyer beware: Are diamond-coated seal faces the solution to dry running?

A scientific study was undertaken to evaluate the performance, under dry running conditions, of two types of diamond coatings applied to silicon carbide faces of mechanical seals.

Seymour, M., Engineering & Quality Systems

A scientific study was undertaken to evaluate the performance, under dry running conditions, of two types of diamond coatings applied to silicon carbide faces of mechanical seals. The coatings studied were polycrystalline diamond (PCD) and plasma-assisted chemical vapor deposition (PA-CVD). Both methods produced coating thicknesses on the order of 10 microns (µm), with the former being three times the cost of the latter. A seal face dry running condition can occur when the flow of process fluid is interrupted, causing a reduction of the fluid that would otherwise serve as a lubricant between the contacting seal faces. Without this lubricating effect, the friction-induced temperature increase

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