Hydrogen Isotope Research Center - Toyama Univ.
Data Base for Tritium Solid Breeding Materials (Li2O, Li2TiO3, Li2ZrO3 and Li4SiO4) of Fusion Reactor Blankets --- Yoshiaki FUTAMURA
7. Database for Li4SiO4 (αLi4SiO4)
7.2 Mechanical properties
7.2.1 Young's modulus (GPa)
| No. | Data and remark | Fig. | Refs. |
| 1 | E=110(1–p)3[1–2.5×10-4(T–293)]
0.02≦p(porosity)≦0.32, 293K |
- | 85, 87 |
| 2 | Porosity Dependence of Young's Modulus values for Li4SiO4, Li2O and Li2ZrO3. | 7.1 | 6, 17, 50 |
7.2.2 Poisson's ratio
| No. | Data and remark | Fig. | Refs. |
| 1 | ν=0.24, p=0.1, T=293K | - | 87 |
7.2.3 Tensile strength (MPa)
| No. | Data and remark | Fig. | Refs. |
| 1 | Tensile failure strength, MPa
σft=150 dg-0.5exp(–4.3p)·(1850/T) 4≦dg≦50 μm, 0.02≦p≦0.32, T = 293K |
- | 16 |
7.2.4 Compressive strength (MPa)
| No. | Data and remark | Fig. | Refs. |
| 1 | σc=975 dg-0.44(1–p)1.5, (dg = grain diameter in μm)
15≦dg≦100 μm, 0.06≦p≦0.28, T=293K |
- | 27 |
7.2.5 Bending strength (MPa)
| No. | Data and remark | Fig. | Refs. |
| 1 | Ultimate bending strength, MPa
σb=275 dg-0.5exp(–4.3p) 4≦dg≦50 μm, 0.02≦p≦0.32, T=293K |
- | 86 |
7.2.6 Rupture strength (MPa) --- No data
7.2.7 Crush strength --- No data
7.2.8 Thermal creep rate (1/s)
| No. | Data and remark | Fig. | Refs. |
| 1 | εc=1.4×10-2exp(–2.5×103/T)σ
10≦σ≦40 MPa, 0.08≦p≦0.22, 1000≦T≦1220K |
- | 87 |
7.2.9 Vickers hardness --- No data
7.2.10 Thermal shock resistance
| No. | Data and remark | Fig. | Refs. |
| 1 | Crack generation due to the thermal strain is determined by using the
following thermal shock parameters.
R'=σf·κ·(1–ν)/Eα σf : tensile strength κ : thermal conductivity υ : Poisson's ratio E : Young's modulus α : thermal expansion coefficient Thermal shock resistance is actually estimated by the value of κ/Eα. The value of κ/Eα at 600°C for ceramic breeder materials are shown in the following Appendix 7.2.10. |
- | 6 |
Appendix 7.2.10 Material properties related to the generation of thermal crack in ceramic breeder materials.6)
| Material | κ (600°C)
(W/m-K) |
α (600°C)
(10-3K) |
E (R.T.)
(GPa) |
κ/Eα
(10-6m2/s) |
| Li2O | 3.5 | 3.3 | 70 | 1.5 |
| Li2ZrO3 | 1.4 | 1.1 | 70 | 1.8 |
| Li4SiO4 | 1.9 | 3.6 | 50 | 1.1 |
7.2.11 Thermal cyclic loading properties
| No. | Data and remark | Fig. | Refs. |
| 1 | Pebble (93%TD, 1 mm in size, 40 μm grain size)
400°C~800°C, 20 °C/s, 50 cycles →Fractured significantly |
- | 78 |
| 2 | Pebble (80%TD, 0.4~0.6 mm in size, 40 μm grain size)
400°C~800°C, 20 °C/s, 50 cycles →Good performance |
- | 78 |
