Analysis of the crystal phases of Na+-beta-aluminas synthesized by infiltration of alkali molten salts

作者：Lee Dae Han; Lee Sung Tae; Lee Ki Moon; Lim Sung Ki^*

来源：Journal of Industrial and Engineering Chemistry, 2012, 18(5): 1801-1806.

DOI：10.1016/j.jiec.2012.04.006

• Na+-beta-alumina
• Molten alkali salts infiltration
• Solid electrolyte

Na+-beta-aluminas in ternary Na2O-Al2O3-Li2O systems were synthesized by infiltration of alkali molten salts into porous alpha-Al2O3 pre-form. The effects of calcination temperature, infiltration time, and starting materials on phase formation were investigated. Pre-forms were fabricated by pressureless powder packing (PLPP), slip casting, and cold isostatic pressing (CIP) with fused and calcined alpha-Al2O3 powder. They were heated and infiltrated by alkali molten salts at [Na2O]:[Al2O3] = 1:5 (Li2O = 0.4 w/o). Each infiltrated specimen was calcined at 1100-1300 degrees C to form Na+-beta-aluminas, whose crystalline formations, phase fractions, and alkali ion contents were analyzed. The pre-form prepared by PLPP with 1 mu m-calcined alpha-Al2O3 powder showed the highest Na-beta%26quot;-Al2O3 phase fraction (59.5%), without residual alpha-Al2O3 phase.

• 出版日期2012-9-25