Erosive wear characteristics of technologically important ceramic materials
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Date
1998-11-07
Authors
Wijayasinghe, H. W. M. A. C.
Karunaratne, B. S. B.
Journal Title
Journal ISSN
Volume Title
Publisher
University of Peradeniya
Abstract
Wear is a major cause of component failure in machines and associated friction
is an unwanted energy consumer. Ceramics are much less susceptible to wear than
metals. The potential advantage of ceramics compared to metals and polymers include
high hardness, chemical stability, strength retention over a large temperature range and
low cost. Based on these properties ceramics are largely considered for wear
applications such as seals, nozzles, cutting tools, wear pads and liners. This paper
presents a study of erosive wear behaviour of some selected technologically important
ceramics. Experiments were performed to compare the resistance to erosion under a
fixed set of experimental conditions and also to study the dependence of erosion on
particle size distribution and slurry loading of the erodent particles.
Pressureless sintered Ca, Y, Yb and Nd a/b-sialon ceramics with different aIb
ratios, hot pressed Ca and Y-a/b-sialons, b-sialons, ShN4, SiC and Ce02 stabilised Zr02
were used as sample materials. a-alumina was used as the controlling sample to ensure
identical test conditions. For this study, a simple slurry pot tester was constructed and
SiC particles in distilled water was used as the erodent slurry. Three different slurry
loadings were prepared with three different particle size distributions of the erodent
particles. Erosion of the specimens was determined as a function of time by measuring
the mass loss.
All the a/b-sialon ceramics showed a superior resistance to erosion. Particularly
the hot pressed a/b-sialons showed better resistance than the pressureless sintered
materials. The sialon ceramics with a higher a content showed higher erosion
resistance. The other ceramics showed less resistance to erosion than the aIb-sialons
and can be ranked in a descending order as b-sialons, SiC, SbN4, a-alumina and Ce02
stabilised Zr02. However, these ceramics showed better erosion resistance than that
reported for hard.steel, This investigation also revealed that the parameters such as the
particle size distribution and the slurry loading play an important role on the erosive
wear. The erosion rates and hence the cumulative erosions were increased with the
increasing of the particle size and also with the increasingof the slurry loading.
Description
Keywords
Erosive characteristics , Wear , Physical sciences , engineering and technology , Ceramic , Materials
Citation
Proceedings & Abstracts of the Annual Research Sessions 1998, University of Peradeniya, Peradeniya, Sri Lanka, pp.97