LITHIUM ALUMINATE (LiAlO2)

Lithium aluminate (LiAlO2) is a candidate tritium breeding material for a D-T fusion power plant blanket.

DATA AND CORRELATIONS

The thermal and physical properties of lithium aluminate are from refs [1, 2]. Correlations of the thermal and structural properties as functions of temperature are as follows:

(1)

(2)

(3)

(4)

with p the porosity and all temperatures in degrees K. These equations are valid in the temperature range of 300-1100 K. The coefficient b in Eq 2 is assumed to be the same as that for lithium oxide.

Figures 1-2 show the variation of properties with temperature and Figs 3-4 show the effect of porosity on the thermal conductivity and elastic modulus.

           TABLE 1 Thermal and Structural Properties of lithium aluminate
  T K    [[rho]]    E GPa       [[nu]]  k W/m-K     c J/kg-K    [[sigma]]y  [[alpha]]   
         kg/m3                                                  MPa         (10-6)      
                                                                            m/m-K       
  300    2600.0     209.735             9.143       967.569                 11.043      
  350               207.845             8.088       1040.726                11.273      
  400               205.955             7.254       1095.260                11.504      
  450               204.065             6.583       1138.966                11.734      
  500               202.175             6.035       1175.950                11.965      
  550               200.285             5.584       1208.541                12.195      
  600               198.395             5.211       1238.140                12.426      
  650               196.505             4.903       1265.631                12.656      
  700               194.615             4.649       1291.595                12.887      
  750               192.725             4.442       1316.425                13.117      
  800               190.835             4.277       1340.395                13.348      
  850               188.945             4.150       1363.702                13.578      
  900               187.055             4.056       1386.488                13.809      
  950               185.165             3.994       1408.860                14.039      
 1000               183.275             3.961       1430.900                14.270      
 1050               181.385             3.957       1452.668                14.500      
 1100               179.495             3.979       1474.214                14.731      
 1150               177.605             4.028       1495.574                14.961      
 1200               175.715             4.103       1516.780                15.192      


k (W/m-K)         c (J/kg-K)

Temperature (K)

Figure 1: Thermal conductivity and specific heat of lithium aluminate.





E (GPa)          [[alpha]] (10-6 m/m-K)

Temperature (K)

Figure 2: Elastic modulus and thermal expansion of lithium aluminate.





k (W/m-K)

Temperature (K)

Figure 3 : The effect of porosity on the thermal conductivity of lithium aluminate.





E (GPa)

Temperature (K)

Figure 4 : The effect of porosity on the elastic modulus of lithium aluminate.





References

  1. M. Akiyama. Design Technology of Fusion Reactors, pg 459 - 474.

  2. Modelling, Analysis and Experiments for Fusion Nuclear Technology, FNT Progress Report : Modelling and Finesse. January 1987, Chapter 2.2.