利用激光烧结技术制备316不锈钢/MCrAlY复合多孔金属材料。利用扫描电镜及轮廓仪表征了激光烧结试样的形貌, 研究了在激光作用下聚苯乙烯空心球造孔剂的造孔机制。同时对烧结试样的力学性能及高温抗氧化性能进行了测试。结果表明： 成形孔洞平均分布在20 μm左右, 孔隙率为61%, 孔洞与孔洞之间有序的排布, 孔壁之间连接较好, 贯通性良好, 聚苯乙烯空心球造孔剂起到了重要的作用。烧结试样压缩强度达到4.78 MPa; 在900℃下氧化50 h增重仅为3.49 mg/cm^2。
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℃.
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