电泳共沉积超细金刚石/玻璃复合涂层的研究

Study on electrophoretic co-deposition of ultrafine diamond/glass composite coatings

通过电泳共沉积技术制备超细金刚石/玻璃复合涂层,主要探讨了电泳沉积工艺及固化烧结条件对涂层的影响。超细金刚石粉体在乙醇溶液中荷负电,为阳极沉积。通过电流变化和形貌观察研究涂层沉积质量,结果表明:电压为30～50 V时,可以形成均匀平整的复合涂层。添加质量分数为0.05%～0.10%的金属阳离子能实现阴极沉积,避免了阳极腐蚀,有利于基板的选择。复合涂层最优固化烧结温度为450°C,反应时间为3 h,烧结后的涂层光滑致密且实现了金刚石在黏结相中的均匀分布。

Ultrafine diamond/glass composite coatings were prepared by electrophoretic co-deposition.Electrophoretic deposition parameters and solidification sintering conditions were mainly discussed.Diamond particles were negatively charged in ethanol and moved towards the anode in the applied electric field.Current changes and surface morphologies observation results indicated that uniform and even coatings were obtained with applied voltages of 30~50 V.By adding metal cation with the mass fraction of 0.05%~0.10%,cathode deposition could be realized,which was beneficial to the choice of substrate by avoiding the anode corrosion.The optimized sintering temperature and reaction time of the composite coating were around 450 °C and 3 h,respectively.The sintered coating was very smooth and compact with diamond particles homogeneously dispersed in the bond.