PRODUCTION OF FINE YTTRIUM OXIDE POWDER

摘要

PURPOSE:To improve sinterability with a uniform grain diameter by adding urea to an aqueous solution of YCl2 or Y(NO3)3, hydrothermally reacting the resultant mixture solution and calcining the obtained fine (basic) Y2(CO3)3 powder. CONSTITUTION:Urea in an amount of about 1.2 times based on that of neutralization is added to an aqueous solution of YCl2 or Y(NO3)3 and the resultant mixture solution is then filled in an autoclave lined with Zr (alloy), hydrothermally reacted at 100-300 deg.C under =90atm pressure, subsequently washed and dehydrated to afford fine (basic) Y2(CO3)3 powder, which is then dried and subsequently calcined at 700-1000 deg.C to provide fine Y2O3 powder having about 30nm grain diameter.