The invention relates to a method for preparing
rare earth doped lead-free sealing glass with
low melting point, which comprises the following steps: based on raw materials adopted by a Bi2O3-ZnO-B2O3 glass
system, adding proper amount of
rare earth oxide into the raw materials, and mixing, melting, annealing,
grinding and sieving the mixture to obtain the
rare earth doped lead-free sealing glass with the
low melting point. The sealing glass comprises the following main components by weight portion: 65.22 to 85.22 portions of
bismuth oxide, 4.63 to 11.78 portions of
boric acid, 5.76 to 10.76 portions of
zinc oxide, 0.80 to 2.80 portions of
copper oxide, 0.42 to 2.42 portions of
cobalt oxide, 3.32 to 8.47 portions of
barium carbonate, 0.4 to 1.8 portions of aluminum oxide, and 0.1 to 6.0 portions of rare earth oxide. The method solves the problems that the sealing glass with the
low melting point has low sealing temperature, high sealing strength, stable
glass structure and the like under lead-free conditions, and has the advantages of simple process, practicability and reliability; and the prepared rare earth doped lead-free sealing glass with the low
melting point is particularly suitable for sealing and closing of stainless steel materials, electrons and electric appliances.