ZrO2纳米颗粒在Ni-ZrO2复合镀层中的分散性对镀层结构及性能的影响

研究了ZrO2纳米颗粒以单分散态和团聚态在Ni-ZrO2复合镀层中存在时,对Ni-ZrO2复合镀层结构与性能的影响.采用复合电沉积方法,分别在加有和未加有分散剂的条件下,制得了Ni-ZrO2复合镀层.扫描电镜(SEM)和X射线衍射(XRD)分析表明,利用分散剂MZS可以得到ZrO2纳米颗粒在Ni基质上均匀单分散的Ni-ZrO2纳米复合镀层.而未使用分散剂的复合镀层,ZrO2纳米颗粒在镀层中发生团聚,分散性差.ZrO2纳米颗粒在Ni-ZrO2复合镀层中的分散态不同,也将影响镀层中Ni的结晶择优取向.ZrO2纳米颗粒单分散的纳米复合镀层较ZrO2纳米颗粒团聚态的复合镀层的硬度大大提高.

Effect of Dispersibility of ZrO2 Nanoparticles in the Ni-ZrO2 Composite Coatings on Microstructures and Properties of Composite Coatings

The effects of ZrO_2 nanoparticles in the Ni-ZrO_2 composite coatings existed in monodispersed or agglomerated on microstructures and properties of composite coatings were studied. The Ni-ZrO_2 composite coatings were prepared with and without dispersant(MZS) under DC electrodeposition condition. The morphology of the coating was examined by SEM and the texture of the matrix nickel were detected by XRD. It is found that zirconia nanoparticles are monodispered into matrix nickel with dispersant, but zirconia nanoparticles are agglomerated without dispersant. The dispersibility of ZrO_2 nanoparticles in the Ni-ZrO_2 composite coatings can affect the preferred orientation of the matrix metal remarkably. The result show that the hardness of Ni-ZrO_2 composite coatings can be improved because of good dispersibility of ZrO_2 nanoparticles in the composite coatings