磷元素对铜基金属粉末选区激光烧结作用机理  

Mechanism of P element in selective laser sintering of copper-based metal powder

作　　者：顾冬冬[1] 沈以赴[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《中国有色金属学报》2006年第6期999-1005,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(10276017);航空科学基金资助项目(04H52061);南京航空航天大学科研创新基金资助项目(S0403061)

摘　　要：对不同CuP含量的多组分铜基金属粉末(Cu-CuSn-CuP)进行了选区激光烧结实验。利用X射线衍射和扫描电镜研究了添加元素P对烧结致密度及显微组织的影响。研究表明:P元素能在烧结过程中充当脱氧剂而与Cu反应生成CuPO3;但当P过量时,则会因熔体过热倾向明显而加剧氧化;适量增加P元素能改善烧结件层间结合性;而P元素过量则会因生成过多磷渣而降低润湿性及致密度;P元素亦能充当稀释剂而降低熔体粘度及表面张力,从而改善烧结致密度及组织均匀性;但若P元素过量时,则会因熔体粘度过低而导致球化现象。实验结果证实,该组铜基金属粉末体系中CuP的最佳含量为15%。The selective laser sintering experiment of the multi-component copper-based metal powder systems （Cu-CuSn-CuP） with different CuP contents was carried out. The effects of the P addition on the densification and the resultant microstructural features of the laser sintered powder were investigated by X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. The results show that P can act as deoxidizer to react with Cu and form CuPO3. However, excessive P addition results in a larger degree of superheat of the melt, hence aggravating the oxidation. The bonding coherence between the sintered layers increases with the increase of the content of phosphorus. However, at a large amount of P, the solid-liquid wettability and the resultant densification decrease due to the excessive formation of P slag. Element P can also act as a fluxing agent to decrease the surface tension and viscosity of the melt, thereby improve the sintered densification and the microstructural homogeneity. Whereas, with excessive P addition, an extremely low melt viscosity causes bailing phenomena. The results show that the optimal mass fraction of the CuP in the powder system is 15%.

关 键 词：铜基金属粉末 添加剂 选区激光烧结 液相烧结 

分 类 号：TG146[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料]