Alstom (switzerland) Ltd

Daimlerchrysler Rail Systems Gmbh

Reinhard Kn&ouml;dler

Richard Brendon Scarlin

Hartmut Carstensen

Rainer Franke

A metallic component exposed to high temperature steam is provided with a coating comprising a thin primer layer deposited on the surface of the metallic component and a thicker overlay layer on top of the primer layer. The primer layer consists of highly ductile, oxidation resistant material such that it remains free of any defects over a long period of exposure. The overlay layer consists of an oxidation resistant, less ductile, and low-cost material. It protects the thin primer layer from mechanical damage and chemical degradation. The primer layer protects the base material of the metallic component from oxidizing steam that may penetrate through cracks of the overlay layer. Due to suitable choice of coating materials and thicknesses of the layers the coating is low-cost.

Metallic component with protective coating

A method for determining the fatigue strength of a corrodible connecting part between at least two structural parts, with the connecting part being subjected to specified corroding surroundings and a given repeated mechanical strain while being used. Diagrams (stress-number curves) that represents the variable of the repeated strain in relation to the number of strain repetitions until the destruction of the connecting part are used in order to determine the fatigue strength. First, a strain-free pre-corrosion of the connecting parts is carried out in a corrosive atmosphere corresponding to the corrosive atmosphere during the intended use of the part, in a time period after which the duration of the pre-corrosion has hardly any influence on the shape of a stress-number curve that is recorded subsequently. The pre-corrosion connecting part is then subjected to a given repeated mechanical strain in surroundings which match the specific corroded surroundings in order to record a stress-number curve until the fatigue strength has been reached. The pre-corrosion is preferably carried out at a temperature which is higher than ambient temperature, whereby the duration of the pre-corrosion can be significantly reduced.

Growing community of inventors

Sandhausen, Germany

Reinhard Knödler

Growing community of inventors

Sandhausen, Germany

Reinhard Kn&ouml;dler

Reinhard Knödler