本文报道了在氮气气氛下 ,利用激光熔覆Al50 Si15Cu2 0 Fe15准晶粉末制备Al Si Cu Fe准晶态合金涂层。通过选取适当的激光熔覆参数 ,成功的制备了Al Si Cu Fe准晶态合金涂层。X射线衍射 (XRD)分析显示涂层中含有 1/ 1立方类似相α- (Al,...本文报道了在氮气气氛下 ,利用激光熔覆Al50 Si15Cu2 0 Fe15准晶粉末制备Al Si Cu Fe准晶态合金涂层。通过选取适当的激光熔覆参数 ,成功的制备了Al Si Cu Fe准晶态合金涂层。X射线衍射 (XRD)分析显示涂层中含有 1/ 1立方类似相α- (Al,Si)CuFe、β -Al(Si)Fe(Cu)相、λ -Al13 Fe4相和Al0 .7Fe3 Si0 .3 相。制备的涂层显微硬度达Hv914 ,α相和 β相中高的Si元素含量和类似相λ -Al13 Fe4的高含量是影响Al Si Cu Fe合金涂层硬度的主要因素。光学显微镜下显示Al Si Cu Fe合金涂层枝晶细密且取向比较一致 ,一次枝晶臂间距约为 2 5 μm ,且有明显的二次枝晶存在 ,二次枝晶臂间距约为 8μm。摩擦学试验显示 ,随着滑动速度的增加 ,涂层与对偶球之间的摩擦系数逐渐降低 ,且趋于稳定。展开更多
Al-Cu-Fe+Sn quasicrystalline(QC) composite coatings with different volume fractions of Sn, i.e.(12%,) (20%) (and 30%,) were prepared by laser cladding technique. The effects of soft phase Sn and processing parameters ...Al-Cu-Fe+Sn quasicrystalline(QC) composite coatings with different volume fractions of Sn, i.e.(12%,) (20%) (and 30%,) were prepared by laser cladding technique. The effects of soft phase Sn and processing parameters on the microstructure, microhardness and frictional behavior of the coatings were investigated. The results show that after laser cladding, i-phase existing in the powder is decomposed and element Sn reacts with Cu, forming β-CuSn. The volume fraction of Sn addition has less obvious effect on the microstructure, microhardness and friction performance than that of plasma sprayed coatings. The best performance in terms of microhardness and friction are (obtained) for the coating containing 20% Sn additions prepared with the laser power of 950 W and scanning velocity of 3 mm/s.展开更多
基金Project(50075042) supported by the National Natural Science Foundation of China Project(2003034143) supported bythe Postdoctoral Foundation of China
文摘Al-Cu-Fe+Sn quasicrystalline(QC) composite coatings with different volume fractions of Sn, i.e.(12%,) (20%) (and 30%,) were prepared by laser cladding technique. The effects of soft phase Sn and processing parameters on the microstructure, microhardness and frictional behavior of the coatings were investigated. The results show that after laser cladding, i-phase existing in the powder is decomposed and element Sn reacts with Cu, forming β-CuSn. The volume fraction of Sn addition has less obvious effect on the microstructure, microhardness and friction performance than that of plasma sprayed coatings. The best performance in terms of microhardness and friction are (obtained) for the coating containing 20% Sn additions prepared with the laser power of 950 W and scanning velocity of 3 mm/s.
