Hard rock tribology seminar - slurry and dry erosion wear testing
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Transcript of Hard rock tribology seminar - slurry and dry erosion wear testing
![Page 1: Hard rock tribology seminar - slurry and dry erosion wear testing](https://reader033.fdocuments.in/reader033/viewer/2022052700/55a1868a1a28ab72688b4770/html5/thumbnails/1.jpg)
Slurry and dry erosion of
wear resistant steels
Niko Ojala
Hard Rock Tribology Course and Seminar
Tampere University of Technology
November 4th – 5th 2014
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Motivation
• In mining and mineral
processes particle sizes
can be up to several
centimeters
• But the erosion wear
research have been
often done with
under 1 mm particles
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Objectives
• New versatile and application oriented test
method
• Powerful wear tester
• Possibility to test many material types
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Overview to topics
1) The wear tester
2) Slurry and dry erosion testing
3) Wear results
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High speed slurry-pot tester
• Samples in the pin mill configuration
– Four sample levels
– Different sample shapes and sizes
– Up to 20 m/s sample speed
– Up to 10 mm particle size
– Sample rotation test method
time [min]
0-5 L1 L2 L3 L4
5-10 L4 L1 L2 L3
10-15 L3 L4 L1 L2
15-20 L2 L3 L4 L1
One or two samples on one level
Sample levels
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Versatile sample size & shape
Sample types and dimensions
Round profile Ø 18.5 & 26 mm
Square profile 15 x 15 mm
Plate sample 64 x 40 x 6-10 mm
Plate w/ edge
protection35 x 35 x 1-10 mm
Other profiles height <40 mm
Rotating
radius, max95 mm
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• New high speed slurry-pot tester enables testing
– With high speeds, up to 20 m/s
– With large particle sizes, up to 10 mm
– In slurry and dry environments
– Of different materials with various sample profiles
– Of erosiveness (abrasivity) of different abrasives
10 mm
Summary
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2) Slurry and dry erosion testing
3) Wear results
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Slurry and dry erosion testing
• High speed slurry-pot can be used for testing:
– Slurry pumping/transportation
– Wear protection and liner materials in mineral
processes
– Drilling and excavation
– Different materials:
• Steels, cast irons, rubbers, polymers, composites,
thin and thick coatings, surface treated materials,
hard weld overlays…
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Slurry and dry erosion testing
Slurry-pot Dry-pot
Wear mechanisms slurry-erosion, abrasive
erosion
erosion, grinding
abrasion
Particle concentration 0-50 wt.% 100 wt.%
Sample angle (currently) ±45°, 90° 0°
Sample tip speed up to 20 m/s up to 10 m/s
Test time (typical) 4 x 5-20 minutes with
sample rotation
4 x 2-5 minutes
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One tester, many applications…
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3) Wear results
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A structural steel vs a wear resistant steel after the tests with 9 wt% 8/10 mm granite slurry.
Wear surface of a wear resistant steel
Wear surfaces
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Dry grinding abrasion
• Wear resistant steels tested with oversized
granite (12/14 mm).
• Short samples (45 mm), 5 m/s, 2 minutes
Upper surface Lower surface
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Dry grinding abrasion
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• Both methods can yield high wear rates
• For comparison the wear rates below are
calculated for nominal wear areas
0
500
1000
1500
2000
2500
3000
3500
250 rpm2 minutes
500 rpm2 minutes
1000 rpm2 minutes
We
ar
rate
[g
/h m
2]
Dry-pot
S355 400HB 500HB
0
500
1000
1500
2000
2500
Sample level 1 Sample level 2
We
ar
rate
[g
/h m
2]
5 minutes at 1500 rpm
Slurry-pot
S355 400HB 500HB
Slurry and dry erosion
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Conclusions
• The high speed slurry-pot is application
oriented erosion wear tester.
• Sample shape and size can be adjusted for
the needs of the real life application.
• Both slurry and dry erosion testing is
possible.
• Wear environment can be chosen from mild
erosion to severe abrasive erosion or
grinding abrasion.
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Thank you for your attention!
Niko Ojala
Research Scientist, Doctoral student
Tampere University of Technology
Department of Materials Science, Tampere Wear Center
P.O.Box 589, FI-33101 Tampere, Finland
phone: +358 50 317 4516
email: [email protected]
www.tut.fi/twc/en
Acknowledgements