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Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Test vehicle for studying thermal conductivity
of die attach adhesives for high temperature
electronics
Conor Slater, Fabrizio Vecchio, Thomas Maeder, PeterRyser
Ecole Polytechnique Federale de LausanneLaboratoire de Production Microtechnique
27th October 2011
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Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Outline
1 Introduction
2 Test Vehicle
3 System Model
4 Results
5 Conclusions
2/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Outline
1 Introduction
2 Test Vehicle
3 System Model
4 Results
5 Conclusions
3/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
All Electric Aircraft Concept
• Removal of all Aircraft hydraulic and Pneumatic systems
• All are replaced with Electro-Mechanical Actuators(EMAs)
• Engines to supply Propulsion and Electricity only
• Necessity for hightemperature electronics
• High reliability, hightemperature packaging
4/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Outline
1 Introduction
2 Test Vehicle
3 System Model
4 Results
5 Conclusions
5/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Test Rig
6/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Mock Dies
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Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Assembling Test Vehicle
8/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Outline
1 Introduction
2 Test Vehicle
3 System Model
4 Results
5 Conclusions
9/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
System model
• Heat capacity of die
• Thermal conductivity ofdie attach
• Dynamic model describingtemperature decay
• Describes a system thatdecays exponentially
∆T =Q
S(1)
∆T =−L
kAq (2)
−L
kAq − Q
S= 0 (3)
∆T = ∆T0e−kALS t (4)
10/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Outline
1 Introduction
2 Test Vehicle
3 System Model
4 Results
5 Conclusions
11/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Output
• Decay intemperature isexponential
• Shows goodagreement with themodel
• Time constants measured (0.55, 0.72, 0.62, 0.61, and 0.66seconds) for each die
12/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Thermal Conductivity Estimation
τ =kA
LS(5)
k =LSτ
A(6)
• L = 50 µm
• A = 16 mm2
• S = 27.2× 10−3 JK
• Thermal conductivity calculated (0.15, 0.12, 0.14, 0.14and 0.13 W
mK ) for each die
• STYCAST 2741 — 0.33 WmK
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Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Shear Strength
• Shear strength testcan be used inconjunction withthis method
• Here decreasedtime constant hasan increased shearstrength
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Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Visual Inspection
• Shows thatvoids werepresent underthe die
• Leading to areduction inthermalconductivity
15/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Outline
1 Introduction
2 Test Vehicle
3 System Model
4 Results
5 Conclusions
16/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Conclusions
• Thermal conductivity measurement method presented
• Test Vehicle and Test Rig constructed
• Model developed showing good correlation with output
• Thermal conductivity could be estimated
• Shear strength test and inspection under microscopeperformed
17/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Conclusions
• Thermal conductivity measurement method presented
• Test Vehicle and Test Rig constructed
• Model developed showing good correlation with output
• Thermal conductivity could be estimated
• Shear strength test and inspection under microscopeperformed
17/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Conclusions
• Thermal conductivity measurement method presented
• Test Vehicle and Test Rig constructed
• Model developed showing good correlation with output
• Thermal conductivity could be estimated
• Shear strength test and inspection under microscopeperformed
17/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Conclusions
• Thermal conductivity measurement method presented
• Test Vehicle and Test Rig constructed
• Model developed showing good correlation with output
• Thermal conductivity could be estimated
• Shear strength test and inspection under microscopeperformed
17/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Conclusions
• Thermal conductivity measurement method presented
• Test Vehicle and Test Rig constructed
• Model developed showing good correlation with output
• Thermal conductivity could be estimated
• Shear strength test and inspection under microscopeperformed
17/18
Test vehiclefor studying
thermalconductivity
Conor Slater
Introduction
Test Vehicle
System Model
Results
Conclusions
Thank you for your attention
The research in this project has received funding from theEuropean Union Seventh Framework Programme
(FP7/2007-2013) under grant agreementACP8-GA-2009-243119 ”CREAM”.
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