Career Paths for Materials Science and Engineering Graduates Dr. Laura J. Turbini Chemistry Lab...
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Transcript of Career Paths for Materials Science and Engineering Graduates Dr. Laura J. Turbini Chemistry Lab...
Career Paths for Materials Science and Engineering Graduates
Dr. Laura J. Turbini
Chemistry Lab Manager and
Principal Scientist
Research in Motion
Materials AdvantageUniversity of Toronto
2
My Checkered CareerAB, Chemistry
MS and PhD, Inorganic Chemistry
High School Teacher
Industry Researcher and Manager
Technical Editor
University Professor
Research Centre Director
Lab Manager
Principal Scientist
Octobeer 14, 2010
Materials Advantage, University of Toronto
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Engineer
Octobeer 14, 2010
Materials Advantage, University of Toronto
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MS/PhD
Octobeer 14, 2010
Materials Advantage, University of Toronto
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Jobs
Octobeer 14, 2010
Materials Advantage, University of Toronto
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Business Man/Woman
Octobeer 14, 2010
Materials Advantage, University of Toronto
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Marketing and Sales
Octobeer 14, 2010
Materials Advantage, University of Toronto
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Design Engineer
Octobeer 14, 2010
Project Management
Octobeer 14, 2010 Materials AdvantageUniversity of Toronto
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Materials Advantage, University of Toronto
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Industry Management
Octobeer 14, 2010
Materials Advantage, University of Toronto
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Executive
Octobeer 14, 2010
Materials Advantage, University of Toronto
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Professor
Octobeer 14, 2010
Materials in Microelectronics
Octobeer 14, 2010 Materials Advantage, University of Toronto
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Head on Pillow
Octobeer 14, 2010 Materials AdvantageUniversity of Toronto
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April 17, 2007 SMTA Toronto Workshop 2007 15
Dendritic Growth
• Copper dendrite growing from cathode.
• Forms only when copper-complexing reagent present
April 17, 2007 SMTA Toronto Workshop 2007 16
Depletion of Anode:Open Circuit
Tin Dendrites
Octobeer 14, 2010 Materials AdvantageUniversity of Toronto
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April 17, 2007 SMTA Toronto Workshop 2007 18
Important Electrical Parameters• Electric Field
• E = V/d
• Ohms Law • V = IR
• Resistance • R = (d/A)
• Conductivity = 1/
+ -__
OH-
H+
Br-
Pb+2
Cu+2
Cl-
Sn+n
d
l
A = d x l
Anode Cathode
OH-
Br-
H+
Pb+
Cu+2
Cl-
Sn+4
March 10, 2008 TMS Annual Meeting 19
A Closer Look at CAF• Conductive Anodic Filaments are copper-containing corrosion by-
products that emanate from the anode of a circuit and “grow” subsurface toward the cathode, frequently along the fibre-epoxy interface.
CAF+ Anode - Cathode
March 10, 2008 TMS Annual Meeting 20
Conductor Configurations
Hole-to-hole Hole-to-trace
Trace-to-trace
+ _ +
Trace-to-hole
+_
March 10, 2008 TMS Annual Meeting 21
Catastrophic CAF Failure
PTH
CAF“Burn-out”
AnodeCathode
27
Corrosion of Copper in Chloride Media
Formation of CuCl
Cu + Cl- CuCl + 1e-
Generation of oxygen and hydrogen
ions
2H2O O2 + 4H+ + 4e-
CAF Formation
12 CuCl + 3O2 + 6H2O 4Cu2(OH)3Cl + 4Cu2+ + 8Cl-
Pourbaix Diagram of Cu-Cl-H2O system
A. Caputo, L.J. Turbini, and D.D. Perovic, Journal of Electronic Materials, vol. 39, pp. 92-96, 2010
2323
SEM Analysis of PCB cross-section
Copper
Glass Fibres
Filled Epoxy
Core
Prepreg
Prepreg
HDI
HDI
Epoxy and fillers characterization
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Silica is used to reduce the coefficient of thermal expansion (CTE)Aluminum and magnesium hydroxides are used as flame retardants
Epoxy and fillers characterization
25
P Si
O
Time to Delamination
26
Mg
H150
Delamination between epoxy/glass fibers and epoxy/epoxy
27
Temperature to decomposition (Td)
Derivative wt% change/˚C vs. T Overlap curves with all materialsMaterials with Al(OH)3
Materials without Al(OH)3
The presence of Al(OH)3 causes an increase in the rate of weight loss as this compounds starts decomposing at 200˚C 27
Materials Advantage, University of Toronto
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Questions?
Octobeer 14, 2010