激光烧结制备藕状316不锈钢多孔材料的微孔结构特征  

Micropore Structures of Lotus-type Porous 316 Stainless Steel Prepared by Laser Sintering

作　　者：沈以赴[1] 吴鹏[1] 顾冬冬[1] 李玉芳[1] 

机构地区：[1]南京航空航天大学材料科学与工程系,江苏南京210016

出　　处：《航空学报》2007年第5期1236-1241,共6页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金(10276017);航空科学基金(04H52061);南京航空航天大学科研创新基金(S04032061)

摘　　要：对含预合金316不锈钢和造孔剂(组分包括硼酸和氟硼酸钾)的混合粉末,进行了激光烧结制备藕状多孔材料的实验研究。利用扫描电镜分析了激光烧结试样的微观孔隙特征,并测定其孔隙率。结果表明,在较低的扫描速率下可获得孔径分布均匀、孔隙贯通性良好的藕状多孔结构;当扫描速率逐步提高时,孔隙生长方向沿扫描方向的倾斜趋势有所增强,而若扫描速率高于0.12m/s,试样内部藕状多孔结构出现紊乱,有序性降低。随扫描速率逐渐提高,试样孔隙率呈下降趋势。Laser sintering of a mixed powder which consisted of 316 stainless steel, HaBOa and KBF4 was carried out to prepare lotus-type porous materials. The porosity of samples was measured and the characteristics of pores were investigated by scanning electron microscopy （SEM）. The results show that a porous lotus-type structure with fine connectivity and distribution uniformity of pores can be fabricated at a lower scan speed. With increasing the scan speed, the pores＇ tendency to incline towards the scan direction becomes more pronounced. When the scan speed is larger than 0.12 m/s, the lotus-type porous structure becomes irregular. With increasing the scan speed, the porosity of samples becomes lower.

关 键 词：特种加工工艺 激光烧结 藕状多孔结构 316不锈钢 孔隙率 

分 类 号：V252[一般工业技术—材料科学与工程]