Selective Laser Sintering of Si_3N_4 and Al_2O_3 Ceramic Powders

摘要

Selective laser sintering (SLS) of Si_3N_4 and Al_2O_3 powders were investigated in this work. Copolymer was synthesized through monomer MMA and BMA. Infrared spectrum was employed to characterize the as-synthesized copolymer. Results show that the main compositions of the copolymer are PMMA and PBMA. The binders were prepared by mixing the copolymer and the inorganic NH_4H_2PO_4 with certain ratio. Binders were used to coat the Si_3N_4 and Al_2O_3 powders by spray drying. The coated powders were sintered successfully by SLS to make cubic part and rotor part.