Abstract: A method for additive manufacturing is provided, including: mixing a hardener with a sand material, so that the hardener is evenly coated on a surface of the sand material, and then spraying a binder through a nozzle, reacting the binder sprayed through the nozzle with the surface of the sand material evenly coated with the hardener to harden a sand mold. Therefore, the problem of nozzle clogging may be overcome, and a solid with a particle size of less than 0.6 ?m may be obtained by the additive manufacturing. In addition, the hardening speed can be adjusted according to the size of the sand mold. Compared with a general sand mold product, the hardening speed may be increased and the storage life of the binder may be prolonged when the sand mold has a large size.

Abstract: A method for additive manufacturing is provided, including: mixing a hardener with a sand material, so that the hardener is evenly coated on a surface of the sand material, and then spraying a binder through a nozzle, reacting the binder sprayed through the nozzle with the surface of the sand material evenly coated with the hardener to harden a sand mold. Therefore, the problem of nozzle clogging may be overcome, and a solid with a particle size of less than 0.6 ?m may be obtained by the additive manufacturing. In addition, the hardening speed can be adjusted according to the size of the sand mold. Compared with a general sand mold product, the hardening speed may be increased and the storage life of the binder may be prolonged when the sand mold has a large size.

Abstract: A solar cell, comprising: a substrate, including p-n doping structure formed within said substrate; material attached to the back of said substrate, where said material includes glass mixture, aluminum material, organic medium and additive. Wherein said glass needs to be formed by combining two or more glasses: the main composition for post-mixed glass should include Al2O3, Bi2O5, B2O3, SiO2, PbO, Tl2O3 and other metal and non-metal oxides. For the material composition, aluminum powder content is 60˜80 mass %, with approximately 90 to 99.99% purity. Additives include C10˜C24 stearic acid, with the content of less than 5 mass %. The C10˜C24 stearic acid may include oleic acid. Organic medium content is roughly 20˜35 mass %. Wherein said organic medium includes 60˜90 mass % ether class organic solvent, 10˜20 mass % cellulosic resin and 1˜5 mass % of leveling agent, rheological agent or thixotropic agent.