Manufacturing Technology of Refractory Metal Parts Based on SLS Rapid Prototyping

A rapid prototyping process of selective laser sintering (SLS) which can be used to refractory metal parts manufacturing is introduced in this text.SLS material of polymer-coated Mo powder is prepared by coating polymer and freezing grinding methods.The laser sintering process has been experimentally researched,and optimized parameters have been acquired.The post treatment process of prototyping parts has been developed,which is sintering framework-Mo by high temperature combining with Cu impregnation method.At last,refractory metal parts of Mo/Cu composites are gained.SEM graph shows that Mo and Cu are close jointed together,and these phases distribute interlocked Mechanical and thermal properties of the material have been tested,concluding tensile strength(470 MPa),elastic modulus(267.8 GPa),elongation(15%),linear expansion(5.5×10-6/K).The technology can be applied to manufacturing fire-resisting parts of weaponry and aerospace arms,as well as conductance and cooling elements used to electronics industry.