复合电铸Ni-La_2O_3纳米复合材料的组织结构和性能

Microstructure and Properties of Ni-La_2O_3 Nanocomposites Prepared by Composite Electroforming

采用复合电铸工艺制备了不同La2 O3纳米颗粒含量的Ni-La2 O3纳米复合材料 ,用扫描电子显微镜和X射线衍射仪观察分析了纳米复合材料的表面形貌及组织结构 ,与电沉积纯镍作对比研究了纳米复合材料的显微硬度和耐磨损性能。结果表明 ,由于La2 O3纳米颗粒的存在 ,导致Ni -La2 O3纳米复合材料的组织结构发生了改变 ,它比纯镍沉积层具有更高的显微硬度及耐磨性 ,且La2 O3纳米颗粒质量分数越大 ,纳米复合材料的显微硬度越高 ,耐磨性越好。

Ni-La 2O 3 nanocomposites with various La 2O 3 nanoparticles content were prepared by using the composite electroforming process. The microstructure and surface morphology of the nanocomposites had been examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. Microhardness and wear resistance of the Ni-La 2O 3 nanocomposites were also evaluated in contrast with pure nickel deposit. The results show that the presence of La 2O 3 nanoparticles has significant effect on the microstructure of the Ni-La 2O 3 nanocomposites. As a result, the microhardness and wear resistance of the Ni-La 2O 3 nanocomposites are higher than those of the pure nickel deposit. Meanwhile, the nanocomposite exhibits higher microhardness and better wear resistance when the La 2O 3 nanoparticles content is increased.