Electroless plating of spherical Ni-Co-P alloy on synthetic diamond surface
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摘要: 采用化学镀的方法在金刚石的表面镀覆镍钴磷合金,从而增强其与基体结合的能力,并使用扫描电子显微镜和X射线衍射仪研究不同沉积工艺对镀层性能的影响。结果表明:最佳配方为加入11.8 g/L的氯化钴,8.7 g/L的硫酸镍,18 g/L的次亚磷酸钠,50 g/L的柠檬酸钠,60 g/L的硫酸铵和0.1 g/L添加剂,在76 ℃条件下,用浓氨水调节镀液pH值至9.0,连续施镀2 h,在此配方和工艺下,可得到结合紧密的球状突起镀层;不低于400 ℃的热处理可使镀层中析出更多的稳定相Ni、Ni3P、CoP和Co2P。Abstract: To enhance the bonding strength between diamond and matrix, Ni-Co-P alloy is deposited onto the diamond surface by using electroless plating. The influence of different depositing parameters on the performance of the coated layer is studied by scanning electron microscope and X-ray diffraction. Results show that the best formula is cobalt chloride 11.8 g/L, nickel sulfate 8.7 g/L, sodium hypophosphite 18 g/L, sodium citrate 50 g/L, ammonium sulfate 60 g/L and addition agent 0.1 g/L and that the best parameters are solvent temperature 76 ℃, pH value 9.0 and coating for 2 h. At such formula and parameters the spherical protrusions are formed and strongly bonded to the diamonds. It is also found that if the coatings are heated at 400 ℃ or higher, there will precipitate stable phases such as Ni, Ni3P, CoP and Co2P.
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Key words:
- coating mass /
- depositing rate /
- heat treatment
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