3. Assume the activation energy for the creep of Al2O3 is 425kJ/mol. (a) Predict the creep rate, &, for Al2O3 at 1000°C and 1800 psi applied stress. (See Table 6.12 for data at 1300°C and 1800psi.) (b) Calculate the lifetime of an furnace tube at 1000°C and 1800 psi if 1% total strain is permissible. ( = 2.7x10-6/hr for Al2O3 at 1300°C and 1800psi.)

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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ε = ce
{
3. Assume the activation energy for the creep of Al2O3 is 425kJ/mol. (a) Predict the
creep rate, &, for Al2O3 at 1000°C and 1800 psi applied stress. (See Table 6.12 for
data at 1300°C and 1800psi.) (b) Calculate the lifetime of an furnace tube at 1000°C
and 1800 psi if 1% total strain is permissible.
(ε = 2.7x10-6/hr for Al2O3 at 1300°C and 1800psi.)
Transcribed Image Text:ε = ce { 3. Assume the activation energy for the creep of Al2O3 is 425kJ/mol. (a) Predict the creep rate, &, for Al2O3 at 1000°C and 1800 psi applied stress. (See Table 6.12 for data at 1300°C and 1800psi.) (b) Calculate the lifetime of an furnace tube at 1000°C and 1800 psi if 1% total strain is permissible. (ε = 2.7x10-6/hr for Al2O3 at 1300°C and 1800psi.)
TABLE 6.12
Creep-Rate Data for Various Polycrystalline Ceramics
Material
Al2O3
BeO
MgO (slip cast)
MgO (hydrostatic pressed)
MgAl2O4 (2-5 μm)
MgAl2O4 (1-3 mm)
ThO2
ZrO2 (stabilized)
è at 1,300°C, 1,800 psi (12.4 MPa)
[mm/(mm. h) x 106]
1.3
300.0
330.0
33.0
263.0
1.0
1,000.0
30.0
Source: W. D. Kingery, H. K. Bowen, and D. R. Uhlmann, Introduction to
Ceramics, 2nd ed., John Wiley & Sons, Inc., New York, 1976.
Transcribed Image Text:TABLE 6.12 Creep-Rate Data for Various Polycrystalline Ceramics Material Al2O3 BeO MgO (slip cast) MgO (hydrostatic pressed) MgAl2O4 (2-5 μm) MgAl2O4 (1-3 mm) ThO2 ZrO2 (stabilized) è at 1,300°C, 1,800 psi (12.4 MPa) [mm/(mm. h) x 106] 1.3 300.0 330.0 33.0 263.0 1.0 1,000.0 30.0 Source: W. D. Kingery, H. K. Bowen, and D. R. Uhlmann, Introduction to Ceramics, 2nd ed., John Wiley & Sons, Inc., New York, 1976.
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