Investigation of Mechanical and Tribological Properties of Materials in Micro and Nano Scale with Na

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Investigation of Mechanical and Tribological
Properties of Materials in Micro and Nano Scale
with Nano-Indenter and SPM

• Surface Science
• Nano-Tribology Lab

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MTS Nano Indenter XP
Source www.MTS.com
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Digital Instruments NanoScope IIIa SPM
Source www.DI.com
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Adhesion Failure of Ink on Plastic Films

• Adhesion a measure of the strength of bonds
  between the ink and plastic substrate through the
  interface.

• Adhesion Strength Test The Nano Indenter (MTS)
  with a conical-shaped diamond tip (90?, radius
  1mm) is used to scrape the surfaces of the
  samples under an increasing normal force The
  critical forces, at which the interface failed
  and the ink was peeled off the plastic film,
  reflects the adhesive strength.

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Different configurations of adhesion failure
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SPM analysis of adhesion failure
(a) 2-D color-scaled topographic image of a
scratch made under an increasing force from
2.9mN to 3.1mN at the surface of an ink
sample. (b) Profile along the bottom of the
ditch. (c) 3-D view of the topographic
image. (d) Lateral force image taken
simultaneously with the topographic image.
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Hard-coated Polycarbonate Systems
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SPM images of Mar and rough trough
Sample A after scratch at 10mN and 20mN Scan
Size 80?m ? 80?m, Z-range 400nm
Sample A after scratch at 30mN Scan Size 80?m ?
80?m, Z-range 1000nm
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SPM images of cracking and delamination
Sample A after scratch at 40mN and 50mN Scan
Size 80?m ? 80?m, Z-range 4000nm
Sample A after scratch at 60mN Scan Size 80?m ?
80?m, Z-range 4000nm
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Mold-In-Color Plastic Panels
Hardness of the plastic deviate little on
different locations of the panel.
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SPM phase images of sample A
Before washing Scan Size 5?m ? 5?m, Z-range 45?
After washing with IPA Scan Size 5?m ? 5?m,
Z-range 45?
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SPM phase images of sample B
Before washing Scan Size 5?m ? 5?m, Z-range 45?
After being rubbed with cotton Scan Size 5?m ?
5?m, Z-range 45?
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Organic/Inorganic Coatings for Hardware
Brass
Brass substrate
0.25mm ZrNCoating
0.25mm Cr
8mm Ni
Brass
ZrN/Cr/Ni/Brass (traditional coatings)
Hard Coating
Soft Coating
Brass
Organic/Inorganic coatings deposited on brass
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Damage patterns in the real applications
M-1 (500 mm ? 400 mm)
M-3 (500 mm ? 400 mm)
M-2 (500 mm ? 400 mm)
M-1 (z 500 nm/div)
M-2 (z 500 nm/div)
M-3 (z 500 nm/div)
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Fatigue in rubber rings
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EASTERN MICHIGAN UNIVERSITY
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NANO TRIBLOGY LABORATORY