金属粉末激光选区烧结行为的研究

介绍了用CO₂和YAG两种波长激光进行选区激光烧结的方法,并对用两种激光烧结不同金属粉末的行为进行了试验研究.结果表明,不同激光烧结同一种金属粉末,烧结效果不同.用YAG激光烧结钻基金属粉未时,球化效应严重,很难连续烧成形,而用CO₂激光烧结时,情况大为改善.同一种激光烧结不同金属粉末,结果也不同,用CO₂烧结铁粉金属比烧结铅粉更容易连续烧结成形,而用YAG激光烧结铅粉则较容易烧结成形.同时对激光烧结钴基粉末和铅粉产生的球化效应进行了分析,认为激光与材料作用后,粉末材料和熔化状态的润湿性对球化效应起主要作用,选择低熔点金属粉末烧结有利于减少球化效应,提高金属粉末激光烧结成形的精度.

Study on the Behavior of Metal Powder in Selective Laser Sintering

The two methods of using CO2 and YAG laser of different wave length for selective sintering are introduced. The authors researched the behavior of metal powder sintered by the two kinds of laser. The result shows that using different laser to sinter the same metal powder produces different effect When YAG laser is used to sinter the Co based metal powder, the spherical effect is serious and the metal powder is hard to get into shape continuously; when CO2 laser is used to sinter the same powder, the result is greatly improved. Similarly while the same laser is used to sinter the different metal powder, the result is also different. When CO2 laser is used to sinter iron powder, it is easier to lead to continuous shape-forming than to sinter lead powder. But when lead powder is sintered by YAG laser, it can easily form shape. The authors also analyzed the spherical effect produced by laser-sintering Co based powder and lead powder, and concluded that after laser-sintering, the wettability of melted powdered material plays the main role in the spherical effect, therefore selecting the metal powder of low melting point for sintering will help decrease spherical effect and enhance the accuracy of laser-sintering metal powder.