Abstract
AbstractIn the combustion of coal slurry as fuel in large‐bore diesel engines, a relatively large amount of abrasive ash occurs (iron oxides and quartz). The object of this work was to make the running surfaces of such engines – especially the piston rings and cylinder liner – so resistant to wear that service life similar to that using ash‐free fuels is obtained.Based on result of operational wear stressing tests wear damage was identified as mainly abrasive. A novel materials solutions is to crush the ash particles to a subcritical size when they enter the lubrication gap. For this, all running surfaces involved must be provided with the same surface: a hard, tough matrix and about 30–70% hard phase with grain sizes of 30–200 m̈m and minimum hardness around 2000 HV highly resistant to abrasion.The layer built up with powder and bonded metallurgically consists of a matrix containing chromium and molybdenum, with austenitic/martensitic structure formation, in which titanium, vanadium and/or tungsten coarse carbides are embedded. Initial abrasion tests carried out on selected samples confirm the validity of our wear hypothesis and our material model.
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