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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5. Database for Li₂TiO₃(β)

5.2 Mechanical properties

5.2.1 Young's modulus (GPa)

No.	Data and remark	Fig.	Refs.
1	266.8(1–p)(1–1.2p)2, (GPa)     0.1≦p (porosity)≦0.3, 300 K, 1~2 μm grains	-	50
2	123.3 (GPa) : Li/Ti = 1.9, 80%TD (p= 0.2)	-	50

5.2.2 Poisson's ratio

No.	Data and remark	Fig.	Refs.
1	0.3(1–p) : 0.1≦p (porosity)≦0.3, 300K	-	50

5.2.3 Tensile strength --- No data

5.2.4 Compressive strength --- No data

5.2.5 Bending strength

No.	Data and remark	Fig.	Refs.
1	60 MPa, 300K, 85%TD, 10 μm grain size	-	61

5.2.6 Rupture strength (MPa)

No.	Data and remark	Fig.	Refs.
1	170(1–2.27p), (MPa) : 0.1≦p (porosity)≦0.3     300K, 1~2 μm grains, Li/Ti=1.9, 80%TD (p=0.2)	-	61
2	92 MPa, Li/Ti=1.9, 80%TD (p=0.2)	-	50

5.2.7 Crush strength

No.	Data and remark	Fig.	Refs.
1	Pebble crush strength, (N) 30N, 4~10μm grains, 85% dense, 1.2mm pebble (Weibull) 40N, 40~140μm grains, 78% dense, 1.2mm pebble (Weibull) 40N, ~20μm grains, 67% dense, 1.6mm pebble (Mean)	-	-

5.2.8 Thermal creep rate (1/s)

No.	Data and remark	Fig.	Refs.
1	12.5×10-6 h-1, 84.2%TD (φ=10mm, h=15mm pellet), 50 MPa, 600°C	-	92
Notes1	Thermal creep rate of Li2TiO3 (φ=10mm, h=15mm, 84.2%TD pellet) at 50 Pa, 600°C.	5.4	92

5.2.9 Vickers hardness (MPa)

No.	Data and remark	Fig.	Refs.
1	363(1–2.36p), 0.1≦p (porosity)≦0.3, 300K	-	50
2	192 MPa, 80%TD, p=0.2, 300K	-	6, 50

5.2.10 Thermal shock resistance

No.	Data and remark	Fig.	Refs.
	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.	-	6

5.2.11 Thermal cyclic loading properties

No.	Data and remark	Fig.	Refs.
1	Effects of thermal cyclic loading on strength of Li2TiO3 sphere in 12 mm size. Compressive strength, N Numbers of thermal cycle Sample 0 3 6 9 12 15 77.6%TD 4~10μm grain size 40.9 44.9 43.1 42.7 42.3 42.7 81.3%TD 40~140μm grain size 35.6 4.4 9.8 33.4 32.5 31.1	-	27, 63
Notes1	Thermal cycle; 273K→1273K at 200 K/hr	-	-
Notes2	Li2TiO3 pellets behavior is expected to be similar to that of Li2ZrO3 pellets and the behavior is excellent under ~3000 cycles.	-	-