
The Slurrytech CIS shaft
sleeve is an exciting new technology wear coating
that offers amazing robustness and wear life
unmatched by existing technology and
products.
The CIS product offers a
uniformed particle matrix able to withstand
thermal cycling without the catastrophic
delaminating problems normally associated
with spray coatings, CIS
performance far exceeds HVOF, PTA, Laser & others
coatings.
Utilising
revolutionary spray technology in
the coating process our sleeves avoid many of the problems associated
with conventional ‘thermal spray’
processes offering the following
advantages:
-
High density,
uniformed carbide microstructure.

-
Major reduction of
inclusions, porosity and
oxidisation.
-
Near metallurgical
bond strength.
-
Thermal cycle
stability.
-
Reduced residual
stresses.
-
Retained properties
of initial particles.
-
High corrosion
resistance to leaching and pitting.
-
High hardness with
excellent wear resistance.
-
Excellent mechanical
strength.
-
Resists delamination
through material hardness and
property disassociation.

COMMON SLEEVE FAILURE MODES
Fatigue Fracture.
A common failure mode for coated shaft
sleeves is Fatigue Fracturing. Fatigue
fracturing occurs when a material is put
under a repeat load cycle such as rotary
movement with a high radial load
creating a flexing effect and or
torsional load.
In most weld coatings parent material of the sleeve is
undercut to facilitate the weld /
thermal inlay. This
results in a metallurgical bond of a
harder, high carbide matrix to a ductile
substrate. In service torsional and
radial loads are
applied to the sleeve, the substrate with lower
hardness and higher toughness can
generally withstand these forces. The
harder weld inlay however always has a
lower fracture toughness along with inherent
stress causing fatiguing and fractures in a
spiral type tortoise shell pattern that
depicts the loads being applied in
service.
Traditional spray
coatings such as HVOF suffers a similar
fate as the harder coating is fractured
and compromised.
The image below shows a typical failure
mode for PTA shaft sleeve that is
becoming more prevalent within the
industry.

Matrix Failure.
Matrix failure occurs when a sleeves
suffers from “wash out” which can happen long before
they wear out. The binding matrix that
holds the harder wearing carbides in
place is washed away by either chemical
attack or by submicron wear. This leaves the
sleeve with a "fluffy" abrasive surface of
exposed carbides which attack the
packing materials.
Manufacturing Faults.
In an independently commissioned report
on one of the most widely used sleeves
it was discovered that the wear
resisting carbides were simply not bound
sufficiently in the matrix, in simple
terms they were falling out like loose
teeth. The root cause for this result is
based in manufacturing control of heat /
energy input along with shielding
gas control which can compromise the matrix
integrity.
COATING PROPERTIES
The following table gives an overview of
different coating technologies and their
properties.
|
SlurrytechTM
CIS
|
Thermal
Spray HVOF
|
Weld
Overlay PTA
|
Plasma
Spray
|
Bond Strength
|
High
|
Very Low
|
Very High
|
Low
|
Complex Geometries
|
No
|
No
|
Difficult
|
No
|
Abrasion Resistance
|
High
|
Moderate
|
High
|
Moderate
|
Erosion Resistance
|
Good
|
Low to Moderate
|
Moderate
|
Low
|
Corrosion Resistance
|
High
|
Low
|
Moderate
|
Low
|
Impact Resistance
|
Moderate
|
Low
|
Moderate
|
Low
|
Oxide Level / Porosity
|
Very Low / Very Low
|
High
|
Low / Low
|
High
|
Temperature Resistance
|
Moderate to High
|
Moderate
|
Moderate
|
Moderate
|
WC % Concentration
|
~ 85
|
~ 65 - 70
|
~ 65 - 75
|
~ 60
|
Metallurgical Bond
|
Infused Bond
|
No
|
Yes
|
No
|
Life Factor
|
1.8 - 4
|
1.0
|
1.5 – 2.5
|
0.8 - 1.0
|
MATRIX FEATURES
The micrographs below show CIS, PTA and HVOF matrix
structures.
PTA and HVOF coatings
have clearly defined phases of material between
hard phase (Carbides) and the
binder along with some matrix flaws of
porosity and oxidization.
The CIS coating however
presents a uniformed matrix with fewer
flaws and a more uniformed
microstructure.

CASE HISTORIES
CIS sleeves have been
proven successful in some of the most
arduous duty conditions.
High thermal cycling frequency which
normally causes coatings to fracture and/or
delaminate has minimal effect on the
CIS sleeve.
Refinery Transfer
Pump: 8/6E-AH
Sleeve |
Run
Hours |
Wear mm |
Location / Failure |
Conclusion |
PTA |
960 |
4.0 |
Uniformed
across sleeve / Fractured |
Replace |
Laser |
960 |
3.0 |
Uniformed
across sleeve / Washout |
Replace |
CIS |
1000 |
1.0 - 1.5 |
Localised
at lip seal / Reuse |
Reverse after another 1000hrs |
Cost Impact: 1 cycle = 1000hrs
CIS
sleeve = 1 sleeve x 1.4 cost / 1
cycle life = Cost Factor = 1.4
PTA sleeve = 2.5 sleeve x 1.0 cost / 1
cycle life = Cost Factor = 2.5
Conclusion: CIS Sleeve has higher
initial cost but is
more almost twice as cost effective
as PTA and other materials.
Gold Tailings
Pump: 6/4E-AH
Sleeve |
Run
Hours |
Wear mm |
Location / Failure |
Conclusion |
PTA |
2500 |
3.0 |
Localised
gouging / Early fracture pattern |
Replace |
HVOF |
1120 |
? |
Uniformed
? / Delaminated coating |
Replace |
CIS |
2360 |
0.4 |
Uniformed
across sleeve / Reuse |
Reuse x 4 |
Cost Impact: 1 cycle = 9440hrs
CIS
sleeve = 1 sleeve x 1.4 cost / 1
cycle life = Cost Factor = 1.4
HVOF sleeve = 4 sleeves x 1.0 cost / 1
cycle life = Cost Factor = 4.0
Conclusion: CIS Sleeve has higher
initial cost but is
more almost 3 times as cost effective
as PTA and other materials.
Mineral Sands
Pump: 4/3D-AH
Sleeve |
Run
Hours |
Wear mm |
Location / Failure |
Conclusion |
PTA |
500 |
1.5 |
Localised
gouging / Fracture pattern &
packing |
Replace |
HVOF |
400 |
? |
? /
Delaminated coating & packing |
Replace |
Laser |
600 |
0.8 |
Uniformed
/ Slight fracturing |
Reuse? |
CIS |
1120 |
0.5 |
Uniformed
across sleeve / Reuse |
Reuse x 2 |
Cost Impact: 1 cycle = 2000hrs
CIS
sleeve = 1 sleeve x 1.4 cost / 1
cycle life = Cost Factor = 1.4
Laser sleeve = 2.5 sleeves x 1.0 cost /
1 cycle life = Cost Factor = 2.5
Conclusion: CIS Sleeve has higher
initial cost but is
more almost twice as cost effective
as Laser and other materials.
Please feel free to contact us and
arrange to trial this exciting
technology improvement in your slurry
and solids handling pumps.