电沉积超薄金刚石切割刀片背面结瘤缺陷的形成机理

Investigation on formation mechanism of nodulation on back of electrodeposited ultra-thin diamond cutting blade

用扫描电子显微镜(SEM)、原子力显微镜(AFM)和能谱仪(EDS)对切割刀片背面结瘤的形貌、电沉积前铝合金基体处理过程中的表面形貌及成分演变等进行观察和分析,得出刀片背面结瘤缺陷的形成机理.结果表明:铝合金基体前处理过程中,其表面析出物周围的铝合金逐渐溶解,析出物脱落,2次浸锌后的铝基体表面留下0~6μm的孔洞;镍-金刚石复合电沉积过程中的镍在孔洞处沉积,去除部分铝合金基体后,在刀片背面形成0~6μm的凸起,即镍瘤.

Scanning electron microscopy (SEM), atomic force microscopy (AFM) and energy dispersive spectrometer (EDS) were used to observe and analyze the morphology of nodulation on the back of the blade and the surface morphology and composition evolution during the treatment of the aluminum alloy matrix before electrodeposition, and the formation mechanism of nodulation on the back of the blade was investigated. The results show that during the pretreatment, the aluminum alloy around the precipitates on the surface of aluminum alloy matrix dissolve gradually, and the precipitates fall off. After twice zinc dipping, the aluminum matrix surface generates 0 to 6 μm holes. The nickel deposit in the holes during the electrodeposition of nickel-diamond composite. After removing part of the aluminum alloy matrix, the 0 to 6 μm bumps are formed on the back of the deposit layer, i.e. nickel nodules.