High temperature anti oxidation porous metal by laser sintering

The 316 stainless steel/MCrAlY porous metal composites were prepared by laser sintering. The microstructures of the laser sintered samples were characterized by SEM and contourgraph. The mechanism of the pore formation by the polystyrene hollow was researched. Meanwhile, the mechanical properties and high temperature oxidation resistance were tested. The results show that the diameter of pores in the sample is about 20 μm with a mean porosity of 61% and good connectivity. The porous are orderly arranged, and a good connection between the pore wall is obtained using polystyrene hollow by laser sintering. Additionally, the porous composites has a good compressive strength of 4.78 MPa; the mass gain of porous composite oxidation is only 3.49 mg/cm² in 50 h at 900℃.