Abstract
Ring‐on‐ring tribological experiments were performed with hybrid mechanical seals with silicon nitride (Si3N4) rings. The K×PV product, where K is the wear coefficient, P the sealing pressure, and V the linear speed, is proposed as a novel parameter to characterize the total working range of a mechanical seal system, with the advantage of directly indicating the thickness reduction for a certain time of service. The K×PV criterion is represented in a map form called “functionality diagram.” The rotary Si3N4 rings show the better behavior (K×PV=0.05 μm/h) against WC–Co mating faces.
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