Embed Size (px)
Citation preview
June 5, 1998 TAMPL 1
Experimental Examination of the Solidification of a Sugar-Wax Mixture
Thermal Analysis of Materials Processing LaboratoryTufts UniversityMedford, MA June 5, 1998
Brendon LewisHeather Stern
Alice Su
June 5, 1998 TAMPL 2
Experimental data - the temperature graph
- microscope pictures
Observations - Things we noted during the experiment
Conclusion - What we learned - More research that can be done
Process - the mold - the thermocouple - the mixture
June 5, 1998 TAMPL 3
•What happens when a wax-sugar mixture is left to solidify at room temperature
• Cooling curves for each thermocouple -Does the location of the thermocouple affect temperature readings?
• Microstructure of the solidified mixture
We want to know:
June 5, 1998 TAMPL 4
Experimental Setup - Creating the Mold:
The mold: - Created using rapid prototyping- Placed two thermocouples to read temperatures in
different parts of the mold
thermocouples
June 5, 1998 TAMPL 5
Experimental Setup - Creating the Mixture
The sugar-wax mixture:- Wax added into beaker containing the sugar solution when sugar solution turned amber
The sugar mixture: -dissolve sugar in water
-sugar heated to around 300oC or until amber color
The wax mixture:- beeswax pellets
June 5, 1998 TAMPL 6
Results :
The temperature time graph we obtained:
•Shows a continuous decrease in temperature•The temperature near the wall of the mold was lower than the temperature in the center
Cooling Curves of Different Regions of the Mold
020406080100120140160180
1
19
37
55
73
91
109
127
145
163
181
199
217
Time (s)
Te
mp
era
ture
(C
)Ambient
Center
Edge
June 5, 1998 TAMPL 7
Results :
The solid obtained after breaking the mold:
A distinct sugar and wax region can be seen
June 5, 1998 TAMPL 8
Results :
Different parts of the cone :
Wax
Sugar
Sugar and Wax
June 5, 1998 TAMPL 9
Results:
Sugar Region
Wax Region
Sugar-wax interface
June 5, 1998 TAMPL 10
Results :
The microstructure of mixture upon solidification:
Regions of sugar crystal in wax Regions of wax in sugar crystal
June 5, 1998 TAMPL 11
Conclusions:
Mold: - Wax decreases in volume as temperature decreases- Difficult to remove cone from mold
June 5, 1998 TAMPL 12
Conclusions:
Mold: - Wax decreases in volume as temperature decreases- Difficult to remove cone from mold
Temperature:- Continuous cooling curve- Temperature readings near the outer edge were lower
June 5, 1998 TAMPL 13
Conclusions:
Mold: - Wax decreases in volume as temperature decreases- Difficult to remove cone from mold
Temperature:- Continuous cooling curve- Temperature readings near the outer edge were lower
Microstructure:- Sugar appears smooth surfaced - Wax has uneven surface
June 5, 1998 TAMPL 14
Further Research Possibilities:
• Try adding wax at different times during heating of sugar solution• Explore different sugar-wax concentrations• Try different cooling rates• Experiment with different shapes
