Using the data in Table 12.5, do the following:
(a) Determine the flexural strength for nonporous MgO, assuming a value of 3.75 for n in Equation 12.10.
(b) Compute the volume fraction porosity at which the flexural strength for MgO is 74 MPa (10,700 psi).
Table 12.5 Tabulation of Flexural Strength (Modulus of Rupture) and Modulus of Elasticity for Ten Common Ceramic Materials
| Flexural Strength |
| Modulus of Elasticity |
|
Material | MPa | ksi | GPa | 106 psi |
Silicon nitride (Si3N4) | 250–1000 | 35–145 | 304 | 44 |
Zirconiaa (ZrO2) | 800–1500 | 115–215 | 205 | 30 |
Silicon carbide (SiC) | 100–820 | 15–120 | 345 | 50 |
Aluminum oxide (Al2O3) | 275–700 | 40–100 | 393 | 57 |
Glass-ceramic (Pyroceram) | 247 | 36 | 120 | 17 |
Mullite (3Al2O3–2SiO2) | 185 | 27 | 145 | 21 |
Spinel (MgAl2O4) | 110–245 | 16–35.5 | 260 | 38 |
Magnesium oxide (MgO) | 105b | 15b | 225 | 33 |
Fused silica (SiO2) | 110 | 16 | 73 | 11 |
Soda-lime glass | 69 | 10 | 69 | 10 |
aPartially stabilized with 3 mol% Y2O3.
bSintered and containing approximately 5% porosity.
(12.10)
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