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Reducing Wear in a coal slurry fired large‐bore diesel engine by material modelling
Author(s) -
Schläpfer H.W.,
Barbezat G.,
Borel M.O.
Publication year - 1990
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19900210607
Subject(s) - materials science , abrasive , metallurgy , abrasion (mechanical) , slurry , piston ring , piston (optics) , carbide , hammer , martensite , tribology , composite material , microstructure , ring (chemistry) , chemistry , organic chemistry , optics , physics , wavefront
In 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.