Experiment FindingsPDF Available

Abstract and Figures

This is a model experiment for Czochralski growth and a challenging test case for multi-physics simulations. The attached PDF file contains a description of the experimental setup and main results. The attached MP4 file contains a video of the growth process (1h 40m real time).
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vKaspars Dadzis vModel experiment v1
10.03.2020
Experimental setup (Czochralski growth of tin)
Hot plate with a
magnetic stirrer (RMF)
Aluminum crucible
(outer diameter of 120 mm)
Rotation
motor
Seed holder
Molten tin
Temperature
sensor
Pulling motor
Stand with pulling
thread
Motor
control
Growing crystal
vKaspars Dadzis vModel experiment v2
10.03.2020
Observation (video)
Real time:
1h 40 min
vKaspars Dadzis vModel experiment v3
10.03.2020
Analysis
Local temperature measurements Infrared image
Oscillations with ∆T=6°C in Al crucible and
with ∆T=100°C in heating element. Inhomogeneous temperature?
dip seed detach
Temperature, °C
Time, min
vKaspars Dadzis vModel experiment v4
10.03.2020
Analysis
T(Al) = 234...240 °C
Pulling = 3 mm/min
Rotation = 0
Two grown crystals
T(Al) = 234...240 °C
Pulling = 3.8 mm/min
Rotation = 0
T(Al) = 230...245 °C
Pulling = 3.8 mm/min
Rotation = 1 rpm
T(Al) = 236...238 °C
Pulling = 3 mm/min
Rotation = 1
RMF = 0
T(Al) = 236...238 °C
Pulling = 1.5 mm/min
Rotation = 1
RMF = 0
T(Al) = 244...245 °C
Pulling = 1.5 mm/min
Rotation = 1 rpm
RMF = 300 rpm
vKaspars Dadzis vModel experiment v5
10.03.2020
Physics landscape
Heat
transfer &
phase
change
Electro-
magnet-
ism
Gas flow Melt flow
Stresses
Melt
Heater
Magnet
Crystal
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