Повышение надежности импульсных торцевых уплотнений

Abstract

В статье приведен новый способ повышения износостойкости рабочих поверхностей стальных колец импульсных торцевых уплотнений, который включает нанесение на них квазимногослойных комбинированных электроэрозионных покрытий, позволяющих получить микротвердость поверхностного слоя в пределах 6500...9600 МПа при шероховатости поверхности Rа порядка 0,5 мкм.

Explosive technology development is followed not only by operating machine parameters increase but also by the existence of new, cheaper but not less reliable composite materials, combining surface protective properties with mechanical base strength. Presented in the article technical solution relates to the field of electrophysical and electrochemical machining, particularly to electroerosion alloying, and can be used for surface processing of impulse face seal (IFS) elements. Set the way of the IFS steel rings working surfaces wear resistance increase, which consists of coating of quasi-multilayers combined electroerosion covering (QCEC). A newmethod of working surfaceswear-resistance increaseof impulse face seal metal rings was proposed, which includes QCEC application of the alloy formed in the sequence of BK8+Cu+BK8, herewith the working surfaces before the application are processed with cementation with electroerosion alloying with energy discharge in the range of 0.036…4.6 J, provided that the hardened layer thickness is increased by layer thickness processed with cementation with electroerosion alloying. Metalographic studies of QCEC have shown that the most preferable for steel supports is the coating BK8+Cu+BK8, where the first and the last layers of solid alloy BK8 are applied with energy discharge Wu= 0.1 J, and the copper with Wu=0.04 J. The surface layer microhardness of such coatings is high enough (Нμ= 6500...9600 MPa), low roughness (Ra= 0.5 micron), the microhardness smoothly decreases from the maximum as penetration increases to hardness of the base metal.