【摘要】 采用爆炸喷涂在3种不同氧燃比的条件下制备铁基非晶涂层,采用X射线衍射(XRD)仪、扫描电镜、纳米压痕仪等研究涂层的微观结构和纳米压痕行为。结果表明:氧燃比为1:1、1.2:1和1.5:1的3种涂层的非晶含量分别为88.71%、86.18%和81.36%。压痕深度在不同载荷下均表现出相似的变化速率,意味着涂层微观结构的高度均匀性。在相似打点位置,氧燃比为1:1和1.2:1的涂层具有较高的硬度,显示出较小的最大压痕深度。在平行于涂层与基体界面方向,纳米硬度几乎无变化,而在垂直于界面方向,随涂层厚度增加,纳米硬度从16.75 GPa降低至10.25 GPa。更多还原

【Abstract】 The iron-based amorphous coatings were prepared by detonation spray under three kinds of oxygen fuel ratios. The microstructure and nanoindentation behavior were examined by XRD, SEM and nanoindenter. The results show that the amorphous phase contents of coatings under 1:1, 1.2:1 and 1.5:1 are calculated to be 88.71%, 86.18% and 81.36%, respectively. The variation speeds of indentation depth are similar under different load, indicating the homogenous coating structure. In similar position, the coatings under oxygen fuel ratios of 1:1 and 1.2:1 have higher hardness, exhibiting smaller maximum indentation depth. In the longitudinal direction, the variation of nanohardness is very small. In the transverse direction, the nanohardness value decreases from 16.75 GPa to 10.25 GPa with increasing the distance from the coating to the substrate.更多还原