METHOD FOR BONDING ALPHA ALUMINA AND BETA ALUMINA

摘要

The present invention relates to a method for bonding alpha-alumina (alumina-α, α-Al2O3) and beta-alumina (alumina-β or β-Al2O3). The method can enhance the bonding strength of the alpha-alumina which is used as an insulation ring in a sodium-sulfur battery and the beta-alumina which is used as an insulator. According to the present invention, the method includes the steps of: (A) executing an acid treatment operation to wash surfaces of the alpha-alumina; (B) executing another acid treatment operation to form pores on surfaces of the beta-alumina; (C) arranging a glass bonding material, which is prepared by adding an RO-based additive to barium-borosilicate-based glass, between the alpha-alumina and the beta-alumina having the surfaces treated in advance and bonding the alpha-alumina and the beta-alumina in an oxidizing atmosphere.