MEASURING NANOTECHNOLOGY M IC RO M A TE R IA LS Recent Developments in Nanoscale Mechanical Property Testing High Temperature Testing and Impact Testing Dr Krish Narain, Dr Ben Beake and Dr Jim Smith, Micro Materials Ltd. Wrexham, UK. Bringing nanomechanical measurements into the real-world
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Dr Krish Narain, Dr Ben Beake and Dr Jim Smith, Micro Materials Ltd. Wrexham, UK.
Bringing nanomechanical measurements into the real-world. Recent Developments in Nanoscale Mechanical Property Testing High Temperature Testing and Impact Testing. Dr Krish Narain, Dr Ben Beake and Dr Jim Smith, Micro Materials Ltd. Wrexham, UK. NanoTesting techniques Nanoindentation - PowerPoint PPT Presentation
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MEASURING NANOTECHNOLOGY
MICROMATERIALS
Recent Developments in Nanoscale Mechanical Property Testing
High Temperature Testing and Impact Testing
Dr Krish Narain, Dr Ben Beake and Dr Jim Smith, Micro Materials Ltd. Wrexham, UK.
Bringing nanomechanicalmeasurements into the real-world
Advantage of the impulse technique:The energy imparted to the sample surface can be calculated at any given time point, since the force is known (static load applied throughout the test), and the displacement is also recorded.
Test conditions for all samples:-1 mN applied load8 repeat impact tests of 30 min each (on different areas of the samples)
Pendulum impulse - DLC
differentiate samples by... • time to failure• type of failure
105 W sample exhibited cohesive failure in only 12.5 % of tests
Illustrative behaviour on sample deposited at 105 W RF power
MEASURING NANOTECHNOLOGY
MICROMATERIALS Pendulum impulse - DLC
115 W sample exhibited cohesive failure in 37.5 % of tests
Illustrative behaviour on sample deposited at 115 W RF power
MEASURING NANOTECHNOLOGY
MICROMATERIALS Pendulum impulse - DLC
125 W sample exhibited cohesive failure in 62.5 % of tests
Illustrative behaviour on sample deposited at 125 W RF power
MEASURING NANOTECHNOLOGY
MICROMATERIALS Pendulum impulse - DLC
Calculation of energy required for failure(neglecting damping, rebound energy)
• Energy per impact = pendulum swing x Force
• Total energy = number of impacts x energy per impact
MEASURING NANOTECHNOLOGY
MICROMATERIALS Pendulum impulse - DLC
(1) Impact-induced coating failure is a statistical process (2) tests are sensitive to small changes in deposition conditions
Diamond-like carbon coatings deposited at higher power have...• shorter time-to-failure• lower energy-to-failure• high probability of cohesive failure• incomplete removal (final depth is lower than thickness)
How does the impact performance of DLC compare to other brittle materials?
Summary
MEASURING NANOTECHNOLOGY
MICROMATERIALS Pendulum impulse - DLC
Fatigue performance of these DLC coatings is worse than FS and Si!
(DLC is in highly stressed state)
much higher load necessary for failure
MEASURING NANOTECHNOLOGY
MICROMATERIALS
To summarise….
1. Nanoindentation techniques are essential in the optimisation of the mechanical properties of thin films and coatings
2. The NanoTest has large range of testing techniques, and thereforeoffers a complete testing capability
3. These techniques are possible due to the unique pendulum design
4. The high temperature option and impact module allow testing undercontact conditions that can closely simulate those in service
5. The versatility and wide range of options have resulted in the systemfinding applications in….
Bringing nanomechanicalmeasurements into the real-world
MEASURING NANOTECHNOLOGY
MICROMATERIALS
• Automotive• Bearings• Biomedical Devices• Ceramics• Composites• Contact Lenses• Cutting Tools• Hard Coatings• Laminates• Magnetic Disks• Microelectronics• Nanocomposites• Optical Coatings
• Optical Disks• Packaging Materials• Paints• Paper Coatings• Pharmaceuticals• Photographic Film• Polymers• Powders• Printing Plates• Semiconductors• Thin Film Adhesion• Turbine Blades• Ultra-thin films