This document summarizes a study on the effect of particle size and distribution on erosive wear. The study tested both brittle and ductile materials using a slurry erosion tester. For brittle materials like alumina coated cast iron, erosive wear increased with rotational speed, ash concentration, and particle size. For ductile aluminum, erosive wear also increased with impact angle and particle size. A correlation was developed showing erosive wear follows a power law relationship with particle size. The conclusion is that for any material, increasing particle size results in increased erosive wear. Control of impact angle and ash concentration can also influence the amount of erosive wear.

1. EFFECT OF PARTICLE SIZE AND SIZE
DISTRIBUTION ON ESTIMATING
EROSIVE WEAR
BY
RISHABH SHARMA
ID -16210015
M.TECH(INDUSTIAL MATERIALS AND METALLURGY)
PEC UNIVERSITY OF TECHNOLOGY
SECTOR 12 CHANDIGARH

2. CONTENT
• INTRODUCTION
-Erosive wear
-General expression for erosive wear
• SLURRY TEST (POT TYPE)
-For brittle material
-For ductile material
• OBSERVATIONS
• CONCLUSION

3. INTRODUCTION
• Wear is damage to a surface as a result of relative motion
with respect to another substance.
• Erosive Wear
Caused by the impact of particles (solid/liquid) against a solid
surface.
– Dust particles impacting on gas turbine blades.
– Slurry impacting on pump impeller.
--Cavitation.
• Erosive wear is function of:
– Particles velocity (K.E.),
– impact angle, and
– size of abrasive

4. GENERAL EXPRESSION
Wear volume by erosion ,
V= K.A(α). i(v).M
A(α)= function of angle of impact of particle.
K is empirical constant
i(v) = (particle velocity)^n
n= 2 to 2.5 for metals
n =2.5 to 3 for ceramics
M = (particle size)^x

5. 1.HIGH SPEED SLURRY EROSION TEST
• Slurry Erosion tester (Construction)

6. 1.HIGH SPEED SLURRY EROSION
TEST(brittle material)
• Specimen –Al2O3 coated(0.5 mm thick) on High Chrome Cast Iron
(Used in impeller blades)
• Abrasive Slurry – Ash particles mixed with water
Variable parameters
• Rotational speed(rpm)
• Ash Concentration(ppm)
• Particle size(micrometer)

7. OBSERVATIONS

8. Weight Loss Vs Particle Size

9. RESULTS
• Specimen before and after slurry test
• With INCREASE in rotational speed , ash concentration and
particle size Erosion wear INCREASES .
• For Erosion wear the effect of particle size of abrasive is less
as compared to other parameters .

10. SLURRY TEST FOR DUCTILE MATERIAL
• Specimen – Aluminum (ductile and expected
to give higher wear rates).
• Abrasive Slurry - Silica sand + Water

11. • Parameter Range

12. • Effect of Impact Angle & Particle size on Wear

14. DEVELOPMENT OF CORRELATION
• Based on the data points as obtained during the
experimentation with regression analysis a correlation were
developed with an R^2 value of 0.91. Correlation has an error
band of 16%.
Ew = 0.075x(θ^0.12)x(Cw^1.09)x(V^3.55)(d^1.37)
Where,
θ = Impact Angle in Degree
Cw = Concentration by weight in %age
V = Velocity in m/sec
d = Particle Size in mm

15. RESULTS
1. The erosion wear of Aluminum increases with increase
in impact angle attaining a maximum at 45° and then
reduces at 90°.
2. Erosion wear of Aluminum increases linearly with
increase in particle size. The rate of increase at low
impact angles are lower compared to that at higher
impact angles.
3. The increase in erosion wear at higher solid concentration is
not very significant.
4. At higher velocities, the weight loss in the reduced duration
was significant.

16. CONCLUSION
• Particle size follows Power Law for erosion
wear.
i.e. Erosion wear α (particle size)^n ,Where
n>0
• For every material increase in particle size will
result in increase in EROSION WEAR.
• Erosion wear can be controlled by using
impact angle and ash concentration.

17. REFERENCES
• INVESTIGATION OF EROSIVE WEAR ON AL2O3 COATED CAST
IRON USING RESPONSE SURFACE TECHNIQUE Sunil Kumar 1
and Jasbir Singh Ratol 2 1 Chitkara University, Rajpura, Punjab,
India 2 Baba Banda Singh Bahadur Engineering College,
Fatehgarh Sahib, Punjab. International Journal of Advances in
Engineering & Technology, May 2012.©IJAET ISSN: 2231-1963
• Study of the Parameters Affecting Erosion Wear of Ductile
Material in Solid-Liquid Mixture Milind Suryaji Patil, Eknath R.
Deore, Ramchandra S. Jahagirdar, Santosh V PatilProceedings
of the World Congress on Engineering 2011 Vol IIIWCE 2011,
July 6 - 8, 2011, London, U.K.

18. THANK YOU !!!