High temperature heat capacity measurement

1
High temperature heat capacity measurement

• Student Rongxiang Hu
  hurongx_at_iit.edu
• Advisor Prof. Nash
  nash_at_iit.edu

2
Heat capacity measurement

• HH0
• SS0
• GH0
• Heat content measurement method
• --------DSC
• --------Calorimeter
• --------flash method

3
Experiment
A alumina tube-furnace shell B insulation
(firebrick) C alumina supporting tube D alumina
tube (cemented onto calorimeter) E reference
section (one thermocouple level) F calorimeter
section or working section (five
thermocouple levels shown) G calorimeter tube H
alumina furnace core I insulation (firebrick) J
alumina beads K lavite support L lavite sleeve
with stainless steel clamp
N alumina extension tube O bakelite clamp P
water cooled jacket R refractory insulation SPt
plate
s
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Experiment
AlaNibXc (298 K) AlaNibXc (T)
?Hheat content
5
Mo heat content comparison
BeO crucible
1 J. Phys. Chem. Ref. Data, 16(1),1987
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Heat content of Al-Ni-Cu compounds
HC11925-17.4T0.006T2
HC14978-22T0.0081T2
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Heat capacity of Al-Ni-Cu compounds
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Heat content of Al-Ni-Cu compounds
HC112-0.026T
HC190-0.12T
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Heat capacity of Al-Ni-Cu compounds
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Heat content of Al-Ni-Ru compounds
HC-7430.58T
HC-26.50.04T
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Heat capacity of Al-Ni-Ru compounds
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Heat content of Al-Ni-Ru compounds
HC-18472.22T-6.010-4T2
HC9880-14.6T0.006T2
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Heat capacity of Al-Ni-Ru compounds
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Heat content comparison
Heat capacity of Ru and Cu (J/mol/K)
Neumann-kopps rule Cp, Al0.5Ni0.2Cu0.30.5C
p,Al0.2Cp,Ni0.3Cp,Cu Cp,
Al0.5Ni0.2Ru0.30.5Cp,Al0.2Cp,Ni0.3Cp,Ru
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Heat capacity of Steel
Heat capacity HC-4600.36T (J/molK)
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DSC of steel
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Conclusion

• High temperature reaction calorimeter can be used
  for the high temperature heat capacity
  measurement, but more data needed to obtain high
  accuracy
• To get heat capacity from the heat content data,
  some theoretical prediction is needed
• Heat capacity of Al0.5Ni0.2Cu0.3 is larger than
  that of Al0.5Ni0.2Ru0.3
• Neumann-Kopp rule is not applicable for the heat
  capacity of some Al-Ni-Cu and Al-Ni-Ru compounds

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Future work

• Heat capacity measurement by DSC
• Determining nice fitting for the heat content
  data obtained by high temperature reaction
  calorimeter
• Enthalpies of formation measurement of Al-Ni-Pt
  compounds