DICHTUNGSELEMENT, INSBESONDERE FÜR ABSPERR- UND REGELORGANE UND VERFAHREN ZU SEINER HERSTELLUNG

摘要

PCT No. PCT/EP95/04535 Sec. 371 Date May 20, 1997 Sec. 102(e) Date May 20, 1997 PCT Filed Nov. 17, 1995 PCT Pub. No. WO96/16201 PCT Pub. Date May 30, 1996A sealing element, particularly for shut-off and regulating valves, comprising a tabular, piston-shaped or spherical shut-off body of a ceramic material having a hard material layer containing carbon and silicon applied to a sealing surface of the shut-off body by plasma chemical vapor deposition or plasma polymerization, in a coating chamber. The hard material layer comprises a bonding layer component applied to the sealing surface of the shut-off body and a subsequent sliding layer component. The carbon-containing bonding layer component has a first silicon content favoring adhesion to the sealing surface of the shut-off body and the subsequent carbon-containing sliding layer component having a second silicon content lower than that of the bonding layer component to achieve low coefficients of sliding friction and static friction. The sliding layer component is selected so as to be essentially thin and the bonding layer component is selected so as to be comparatively thick to take up the residual stresses of the sliding layer component. The hard metal layer is heat treated.