SOLID SOLUTION EFFECTS ON THE MgAl_2O_4-MgGa_2O_4 SYSTEM

摘要

This study focuses on the effect of solid solution on thermal diffusivity. A common refractory material, MgAl_2eO_4 is investigated. Solid solution effects on thermal diffusivity in the MgO-Al_2O3-Ga_2O3 system are studied. Various additions of MgGa_2O_3 to MgAl_2O_4 were prepared and the laser flash technique was used to determine thermal diffusivity at temperatures between 200℃ and 1300℃. It has been determined that solid solution in the MgAl_2O_4-MgC_2O_4 system significantly decreases thermal conductivity up to 1000℃. At 200℃ thermal conductivity decreased 25% with just 10 mol% addition of MgGa_2O_4 to the system. At 800℃ the thermal conductivity decreased 10% with 10 mol% addition. Steady state calculations showed an 11% decrease in heat flux with 10 mol% MgGa_2O_4 considered across a 12 inch brick wall.