Sliding pairing for machine parts that are subjected to the action of highly pressureized and high-temperature steam, preferably for piston-cylinder assemblies of steam engines

摘要

The invention relates to pairs of sliding elements for machine parts exposed to high-pressure and high-temperature steam, preferably piston-cylinder arrangements for steam engines. Here, the pairs of sliding elements consist of a first sliding element which has been produced from a synthetic, fired but not graphitized carbon material which comprises graphitized carbon black and/or natural graphite as significant filler and whose pores are filled with metal, a metal alloy, a ceramic, a synthetic resin and/or pitch which has been carbonized, preferably in the form of a piston and/or piston ring, and a second sliding element, preferably in the form of a cylinder liner or guide bush, comprising an iron-containing, high-temperature-resistant material which is preferably alloyed with chromium and/or nickel and is provided at least on the surface layer with a nitride layer, a light metal alloy, a material which has been produced by a powder-metallurgical route and comprises iron or steel and titanium carbides, a ceramic composite, a carbon material which consists of or consists essentially of graphite or a cemented hard material or a material provided with a sliding layer of cemented hard material. The pairs of sliding elements according to the invention display low wear, in particular even when exposed to supercritical steam and preferably also when exposed to liquid water.