laser surface texturing - indian institute of …laser surface texturing of mechanical seal full and...
TRANSCRIPT
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Laser Surface Texturing
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Laser Surface Texturing
• Laser surface texturing has emerged as a viablemeans of enhancing tribological performance andbiomedical applications in recent years.
• The laser is extremely fast , clean toenvironment and provides excellent control onshape and size of microstructures.
• Several applications will be shown to benefitfrom LST which are dynamic sealing, magneticrecording, internal combustion engines andbiocompatible surfaces.
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Biomedical Applications for Laser
Texturing
– Wettability for better interaction with biological liquids
– Rougher Ti surfaces provide increased osseointegration
– Laser textured surfaces promote better contact guidance
(cell alignment) as compared to sand blasted surfaces
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4
100 W Yb-doped Fiber Laser
SPI Laser SP-100C-0020
Wavelength: 1064 nm
Frequency: CW - 100 kHz
Positioning stages: MikroTools
Resolution/Accuracy : 0.1 µm and ± 1 mm
Indian Patent Application No 442/MUM/2011 Filed on
17 February 2011
Method and device for generating laser beam of
variable intensity distribution and variable spot size
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• Parametric studies for simple channels
• Optimal parameters used for creation of textures
(scan velocity 700 mm/min, Laser power 70 W, Frequency 5 KHz, pulse
width 0.1 ms, single pass)
18 March 2012 5
(a) (b) (c)
400 µm 300 µm 400 µm
SEM image of :(a) fine ridges (b) coarse ridges (c) simple channels
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• Wettability tests could capture the functional response of the surface
• Wettability tests with different fluids:
– Water
– Ethylene Glycol (EG)
– Polyethylene Glycol (PEG)
• Three different surfaces:
– Baseline untreated
– Sand blasted
– Laser textured
18 March 2012 6
Contact angle on laser treated surface
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18 March 2012 7
7%14%
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18 March 2012 8
50
60
70
80
90
100
1 2 3
Co
nta
ct
an
gle
(d
eg
ree
)
Serial number
Reference Surface
Sand Blasted Surface
Laser Textured Surface
62%
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18 March 2012 9
(a)
40
50
60
70
80
1 2 3
Co
nta
ct
an
gle
(d
eg
ree
)
Serial number
Reference Surface
Sand Blasted Surface
Laser Textured Surface
56%
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18 March 2012 10
(b)
30
40
50
60
70
1 2 3
Co
nta
ct
an
gle
(d
eg
ree
)
Serial number
Reference Surface
Sand Blasted Surface
Laser Textured Surface
53%29%
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(a) Wenzel Model; (b) and(c) Cassie-Baxter
Model
•Laser textures are not close to Wenzel’s model and hence are not hydrophilic
• The air pockets trapped in the textures or the micro-scale roughness amplitudes prevent
the drop from spreading over the rough surface
• A wetting condition closer to Cassie Baxter state of wetting is obtained
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Contact angle
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Advancing and Receding Contact angle
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Lotus leaf effect
Self cleaning property as CA =160
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Wenzel and Cassie Model:
When drop is put on the textured surface then there are two possibilities in
which drop interact with the pattern on the surface.
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Wenzel Equation:
=Apparent Contact angle
of a drop on the rough surface
r = roughness factor
Surface texture parameters to quantify roughness
of surface
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Cassie-Baxter Equation
Where ø is the fraction of solid contacting the liquid
…………(1)
Equation (1) can also be written as:
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Force required to move the drop
Force per unit length of perimeter when drop is just about to move is
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Tribological Applications-Regular Micro-
structured surface in the form of dimples
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Direct Processing
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Indirect Processing
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Laser ablated pores in SS
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Indirect Laser Surface Texturing on
52100 Steel
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Frictional Response
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Hydrodynamic Pressure distribution over a single Protrusion
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Why dimple?
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Film Thickness and Geometry of micro-dimples
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Mechanical Face Seal
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Ring on Ring scheme
Friction Torque vs Face loading
For textured and non textured Seals
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laser surface texturing of Mechanical Seal
Full and Partial LST on Seal
Schematic of Partial LST on Seal
Friction Torque vs Sealed Pressure
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Field Test with water Pump
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Laser Textured Piston Ring
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Tape moving on LST Guide