Material Characterization

Material Characterizarion for Power Electronics

G E T thermal and mechanical properties for Finite-Element-Simulations (FEM)

O B T A I N best material design and combinations for a specific application

F I N D optimal manufacturing parameters

U N D E R S T A N D process-lifetime-reliability-interactions for a product

I M P R O V E lifetime and reliability of your packaging concepts

Research and applications

Temperature dependent characterization of mechanical properties including creep-, fatigue-, fracture- and failure-investigations.

Material property mapping by spatially resolved nanoindentation. Application examples: Properties of intermetallic phases,  die-attaches, bond wires and phase boundaries.

Thermal analysis of materials: Specific heat of semiconductors, die-attaches, solder pastes (evaporation of fluxes, melting temperature, solidification behavior), sintering pastes (drying / sintering time, temperature and atmosphere), substrates, TIMs.

Assembly of test specimens

S O L D E R I N G: All kind of solders (lead-free, lead, gold, etc.)

S I L V E R - S I N T E R I N G: Representative specimens for tensile tests and nanoindentation (same thickness and porosity as die-attaches or base-plate attaches)

C H I P - C O N T A C T I N G: Wire ultrasonic bonding and resistance welding

Packaging for Power Electronics

Nanoindentation

Bild mit Verlinkung

Produktblatt vorhanden?

  • Local mechanical characterization
    (up to 500 °C)
  • Get material properties of Bulk / Interface / Adhesion for FEM-Simulation
  • Optimize material model parameters thorugh experiments simulations
  • Diverse materials from soft (e.g. PDMS) to hard (e.g. Al2O3)
  • Aged material analysis

genauerer Beschreibungstext

Tensile and compression testing

Micro scale thick silver-sintered dog bone immediately before hot tensile test

Global mechanical material parameters:

  • Temperature dependent
  • Young’s modulus, tensile-, compressive-, yield-, creep- and fatigue strength
  • Different strain rates for time-dependent material behavior
  • Stress-strain curves for nonlinear FEM
  • Special data for different material models, e.g. Ramberg-Osgood

Material Characterization of packaging materials for finite element simulations

Silver sintered dogbone - tensile test

Sintering paramters:
30 MPa, 250 °C, 120 s

Size: 50 mm x 5 mm x 50 µm

Test speed: 1 mm / second

 
Results of the tensile test:
Maximum strain at 20 °C: 0,40 %
Maximum strain at 250 °C: 2,25 %
Micro scale thick silver-sintered dog bone immediately before hot tensile test
© Fraunhofer IISB
Micro scale thick silver-sintered dog bone immediately before hot tensile test
Mechanical behavior of silver-sintered dog bone in tensile test at different test temperatures and sintering pressures
© Fraunhofer IISB
Mechanical behavior of silver-sintered dog bone in tensile test at different test temperatures and sintering pressures

3D-Focussed-Ion-Beam

FIB

Employee working on High-Rate Xe-Plasma Focussed Ion Beam Plant

3D-Focussed-Ion-Beam-Tomography of sintered silver used to visualize its void morphology

Interconnections made from sintered silver showing superior electrical, thermal and mechanical performance in power electronics applications. While its chemical composition is predominantly responsible for the conductivity properties, the void amount and morphology inside the material is crucial for its mechanical behavior.

A 3d-Focussed-Ion-Beam-Tomography gives insights about these morphological properties. Individual pores in the shown model are color-labeled by using a watershed-separation algorithm. This allows for advanced analysis of statistical quantities like the distribution function of pore volume, pore area, pore shape, eigenvectors, degree of cross-linking and many further. Knowing these quantities enables a deeper understanding of the sintering process – assembly performance interactions.

 

Simultaneous thermal analysis STA

PLATZHALTERBILD

Produktblatt vorhanden?

Thermal material parameters:

  • Characteristic temperatures (Sintering, melting, formation of intermetallics, decomposition, oxidation, glass transition)
  • Temperature dependent specific heat capacity measurements
  • Analyse of peak areas in dependence of mass change
  • Kinetics of reactions (e.g. oxidation, sintering)
  • Evaluation of mass change steps (leakage of organics, debinding)

 

  Tensile Testing Nanoindentation STA
Specimen Rectangular cross
section from sheets
to bulk materials
Sample size up to
50 x 50 mm²
Liquid or solid objects
Temperature RT to 300°C RT to 500°C RT to 1500 °C
Atmosphere N2, Air N2,Air, Ar N2, Air, Ar, O2