Hydrogen Isotope Research Center - Toyama Univ.

Data Base for Tritium Solid Breeding Materials (Li₂O, Li₂TiO₃, Li₂ZrO₃ and Li₄SiO₄) of Fusion Reactor Blankets --- Yoshiaki FUTAMURA

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6. Database for Li₂ZrO₃

6.2 Mechanical properties

6.2.1 Young' modulus (GPa)

No.	Data and remark	Fig.	Refs.
1	E=203.5(1–p)(1–1.286p)2[1–2.40×10-4(T–293)]     T=293K, p : porosity	-	75
2	73(GPa), from ν=205.2(1–p)(1–1.28p)2, p : porosity	-	50
Notes1	Young's Modulus values for Li2ZrO3, Li2O and Li4SiO4.	6.2	50

6.2.2 Poisson's ratio

No.	Data and remark	Fig.	Refs.
1	ν=0.2	-	76
2	ν=0.267, (80%TD, Li/Zr=1.9) ν=0.342(1–1.09p), (p : porosity, Li/Zr=1.9)	-	50

6.2.3 Tensile strength (MPa) --- No data

6.2.4 Compressive strength (MPa)

No.	Data and remark	Fig.	Refs.
1	Ultimate compressive strength σc=396 MPa, dg (grain diameter in μm)=0.8 μm, 80%TD	-	75, 73
2	Ultimate compressive strength σc=230±31 MPa, dg = 2 μm, 80%TD	-	75, 73
Notes1	Compressive strengths for Li2ZrO3, Li2O and Li4SiO4.	6.3	17

6.2.5 Bending strength (MPa)

No.	Data and remark	Fig.	Refs.
1	Ultimate bending strength σb=65±15 MPa, 25°C, dg=2 μm, 80%TD	-	73
2	Ultimate bending strength σb=60±20 MPa, 400°C, dg=2 μm, 80%TD	-	73
3	Ultimate bending strength σb=63±1 MPa, 600°C, dg=2 μm, 80%TD	-	73

6.2.6 Rupture strength (MPa)

No.	Data and remark	Fig.	Refs.
1	65 MPa, from 1.21(1–2.32p), p: porosity, 80%TD, Li/Ti=1.9	-	50

6.2.7 Crush strength --- No data

6.2.8 Thermal creep rate (1/s)

No.	Data and remark	Fig.	Refs.
1	2×10-6 (26 MPa) : at 900°C	-	77, 12
2	8×10-6 (745 MPa) : at 900°C	-	77, 12
3	4×10-5 (144 MPa) : at 900°C	-	77, 12

6.2.9 Vickers hardness (MPa)

No.	Data and remark	Fig.	Refs.
1	504.6(1–2.36p) MPa, p : porosity	-	50
2	263.4 MPa, 80%TD	-	50

6.2.10 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 6.2.10.	-	6

Appendix 6.2.10 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

6.2.11 Thermal cyclic loading properties

No.	Data and remark	Fig.	Refs.
1	Effects of thermal cyclic loading. No fractured : Pellet (83%TD) 330→530°C, 30 MPa, 1000 cycles.	-	78
2	Effects of thermal cyclic loading Fractured significantly : Pebble (80%TD, 1mm in size, 40 μm grain size) 330→530°C, 30 MPa, 1000 cycles.	-	78