Laser Sintering Process And Properties Of Glass Beads/Polyethersulfone Resin Composite Powders

Selective laser sintering(SLS)?as a relatively mature additive manufacturing technology,has significant advantages such as fast processing speed,wide application,and ability to make complex shape parts.With the development of selective laser sintering technology,the materials applied to this technology have also attracted people’s attention,but the research of materials has been limited by cost,type and performance.Therefore,from the perspective of cost reduction and non-toxic environmental protection,this paper selects Glass Beads(Glass Beads,GB)/Polyethersulfone resin(Polyethersulfone resin,PES)composite materials as a new type of raw material for selective laser sintering experiments.In this paper,GB/PES composite powder was prepared and subjected to SLS test.The microstructure,mechanical properties,dimensional accuracy,density and process parameters of sintered parts were studied.In order to determine whether the GB/PES composite powder can be subjected to laser sintering experiments,the composite powder can be tested for formability to determine the range of process parameters such as preheating temperature and laser power of GB/PES composite powder laser sintering powder bed.The GB/PES composite powders with different group distribution ratios were prepared,and the tensile,bending and impact test pieces of different group distribution ratios and different process parameters(powder bed preheating temperature and laser power)were sintered.The evolution of microstructure and the change of mechanical properties of sintered parts were studied with the increase of the mass fraction of glass beads.The evolution of microstructure and the change of mechanical properties of sintered parts with the increase of preheating temperature of powder bed With the increase of laser power,the evolution of microstructure and the change of mechanical properties of sintered parts.At the same time,with the increase of the mass fraction of glass beads,the dimensional accuracy and density of sintered parts are changed.With the increase of preheating temperature of powder bed,the dimensional accuracy and density of sintered parts are changed.With the laser power Increase,dimensional accuracy of sintered molded parts and variations in density.And the defects of GB/PES composite powder sintered parts are analyzed,including three kinds of defects caused by laser power(sintering fault,color deepening and difficult to clean the molded parts),two kinds caused by the preheating temperature of the powder bed.Defects(warpage and knot).The optimization of process parameters of GB/PES composite powder sintered parts was studied by orthogonal test method.Using four factors and three levels as the design scheme of orthogonal test,the tensile strength,bending strength,bending specimen density and dimensional accuracy of sintered molded parts were used as evaluation indexes to obtain the best process parameter combination of GB/PES composite powder SLS.The best combination of process parameters is used to process GB/PES composite powder SLS molded parts,and make crafts and mechanical parts.