nrc-london (functional surfaces, laser polishing and texturing) 2016-17
TRANSCRIPT
NRC-AST-London
Capabilities in
Functional Surfaces,
Texturing and Laser Polishing
by Evgueni Bordatchev
NRC-AST-London [email protected]
November 2016
Evgueni Bordatchev, NRC-AST-London, 2016
LASER- AND CUTTING-BASED
TEXTURING, STRUCTURING, PATTERNING
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Evgueni Bordatchev, NRC-AST-London, 2016
Laser texturing for light or friction control
(diameter 570 um, depth ~20 um)
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50 x 50 mm area
Evgueni Bordatchev, NRC-AST-London, 2016
Laser Texturing of cold sprayed coatings (Al alloys)
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Evgueni Bordatchev, NRC-AST-London, 2016
Laser texturing of super-hydrophobic surfaces:
Water drop test
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Evgueni Bordatchev, NRC-AST-London, 2016
Laser texturing of super-hydrophobic surfaces:
Self-cleaning performance
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Evgueni Bordatchev, NRC-AST-London, 2016
Laser texturing of super-hydrophilic surfaces:
Water drop test
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Evgueni Bordatchev, NRC-AST-London, 2016
Laser texturing of super-hydrophilic surfaces:
Vertical super-hydrophilic time-lapse
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Evgueni Bordatchev, NRC-AST-London, 2016
Laser micromachined oil micro-reservoirs
for controlling tribological properties
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Evgueni Bordatchev, NRC-AST-London, 2016
Array of Nano-dimpes
(40 um diam, 350 nm depth, 40 um pitch)
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Evgueni Bordatchev, NRC-AST-London, 2016
Planar Micro-optical Prismatic Elements
(25 x 25 x 8 µm)
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25µm
25µm
Evgueni Bordatchev, NRC-AST-London, 2016
Planar micro-channels in brass
(10 um depth, 90 um width, 10 um wall)
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10-11um
16x16mm
Evgueni Bordatchev, NRC-AST-London, 2016
Array of dimples (e.g. micro-lenses)
(diameter 1.12 mm, depth 0.25 mm)
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a) insert b) Hot
embossed
replica in
PMMA
c) geometry d) surface quality
Evgueni Bordatchev, NRC-AST-London, 2016
Straight V-groves on a waved surface
(1 mm period)
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16 mm × 16 mm
Al 6061
Sa ≤ 20 nm
pitch: 1.0 mm
depth: 0.5 mm
included angle: 90°
R 18 mm
R 18 mm
R 18 mm
Evgueni Bordatchev, NRC-AST-London, 2016
Curved grooves on a flat surface
(1 mm period)
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1.0 mm period
0.5 mm depth
90° included angle
optical surface
quality (Ra < 10 nm)
Evgueni Bordatchev, NRC-AST-London, 2016
Curved grooves on a flat surface
(200 um period)
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0.2 mm period
0.1 mm depth
90° included angle
optical surface
quality (Ra < 10 nm)
Evgueni Bordatchev, NRC-AST-London, 2016
Nano/micro- texturing/structuring
(period 1 µm, depth 2 µm)
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reddish greenish bluish
color changes due to the diffraction grating color separation
Evgueni Bordatchev, NRC-AST-London, 2016
Nano/micro- texturing/structuring
(period 1000 - 200 nm, depth 1000 - 200 nm)
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Evgueni Bordatchev, NRC-AST-London, 2016
Texturing of Al alloy
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14 mm x 14 mm
Evgueni Bordatchev, NRC-AST-London, 2016
Texturing of PMMA plastics
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14 mm x 14 mm
Evgueni Bordatchev, NRC-AST-London, 2016
Texturing of grey-scale images
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10 mm x 10 mm
Evgueni Bordatchev, NRC-AST-London, 2016
Texturing using retroreflective structures
in plastics and in metal
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Evgueni Bordatchev, NRC-AST-London, 2016 23
LASER POLISHING
Evgueni Bordatchev, NRC-AST-London, 2016
Laser polishing of flat surfaces
(H13, best achieved result)
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Sa = 1.4 µm
(original surface)
Sa = 0.2 µm
(rough laser polishing)
Sa = 0.072 µm
(fine laser polishing)
Evgueni Bordatchev, NRC-AST-London, 2016
PS Laser micro-polishing of Inconel 718
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pencil lead
( Ø0.5 mm)
ps LµPed area (4.5 mm x 4.5 mm)
Sa:
Sq:
Sz:
St:
Sa:
Sq:
Sz:
St:
Initial: Sa = 434.8 nm
Polished: Sa = 126.8 nm
Improvement: 70.8%
Evgueni Bordatchev, NRC-AST-London, 2016
PS Laser micro-polishing of H13 tool steel
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Initial: Sa = 0.53 µm Polished: Sa = 0.17 µm
Improvement: 68%
LµPed area µ-milled area
250 µm
LµPed area µ-milled area
Sa = 0.17 µm Sa = 0.53 µm
Evgueni Bordatchev, NRC-AST-London, 2016
Soft tool steel after CNC machining:
LPed surface quality measurements
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Sa = 129.4 nm
improvement: 66.3%
10 min/cm2
Sa = 141.2 nm
improvement: 63.2%
10 min/cm2
initial surface:
Sa = 383.4 nm
after CNC machining
Evgueni Bordatchev, NRC-AST-London, 2016
Soft tool steel after CNC machining
LPed surface quality measurements (cont’d)
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Initial Surface
LPed Surface
Visual comparison of Initial and LPed Surfaces (areas)
Evgueni Bordatchev, NRC-AST-London, 2016
Soft tool steel after CNC machining:
LPed surface quality measurements (cont’d)
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Visual
comparison of
Initial and LPed
Surfaces
(profiles)
Evgueni Bordatchev, NRC-AST-London, 2016
Soft tool steel after CNC machining:
Hardness and Gloss
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Two layer LP
hardness: 257 HV
improvement: 46.9%
gloss (20 deg): 341.9 GU
improvement: 879.7%
gloss (60 deg): 363.2 GU
improvement: 295.6%
Initial surface
hardness: 175 HV
gloss (20 deg): 34.9 GU
gloss (60 deg): 91.8 GU
Two layer LP
hardness: 315 HV
improvement: 79.7%
Two layer LP
hardness: 344 HV
improvement: 96.8% One layer LP
hardness: 253 HV
improvement: 44.8%
Evgueni Bordatchev, NRC-AST-London, 2016
Laser Polishing of stamping dies
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Initial Surface
Laser Polished Surface
Evgueni Bordatchev, NRC-AST-London, 2016
Texturing through Laser Polishing:
New applications: security features, artistic view?
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Evgueni Bordatchev, NRC-AST-London, 2016
Laser Polishing of Al alloys
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visual appearance of reflection
Evgueni Bordatchev, NRC-AST-London, 2016
Laser polishing of 3D surfaces (H13)
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Sa micro-hardness
Original: 1.010 um 300 VH (30.9 HRC)
LPed (flat): 0.248 um 515 VH (50.9 HRC)
Improvement: 75.5% 76%
LPed (center): 0.318 um
Improvement: 68.5%
Evgueni Bordatchev, NRC-AST-London, 2016
Capabilities in Micromachining and Laser Polishing
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Contact information:
Dr. Evgueni Bordatchev
NRC-AST-London
Automotive and Surface Transportation
1-519-430-7107