PTFE粒子对Ni-Cu-P-PTFE镀层性能的影响（英文）

Effect of PTFE Addition on the Properties of Electroless Ni-Cu-P-PTFE Deposits

采用化学镀的方法,调整化学镀工艺参数,在低碳钢表面获得了PTFE含量不同的Ni-Cu-P-PTFE镀层,研究了PTFE粒子对Ni-Cu-P-PTFE镀层表面形貌、相、显微硬度、结合强度以及摩擦等性能的影响。结果表明,Ni-Cu-P-PTFE镀层的沉积速度随着PTFE浓度的增加而升高。进一步的实验结果表明,由于PTFE颗粒自身的疏松结构和软质特性,PTFE颗粒在镀层中的共沉积会引起Ni-Cu-P-PTFE镀层的显微硬度下降。同时Ni-Cu-P-PTFE镀层的结合强度会随着PTFE浓度的增加而减小。此外,PTFE的添加会使Ni-Cu-P-PTFE镀层的摩擦系数降低,这些结果与PTFE粒子在Ni-Cu-P-PTFE镀层中的含量成反比,而与镀液中PTFE粒子的浓度没有良好的对应关系。

The effect of PTFE addition on electroless Ni-Cu-P-PTFE deposit was investigated, such as surface morphology, phasecomposition and microhardness, as well as adhesion strength and friction properties. The electroless Ni-Cu-P-PTFE deposits withdifferent PTFE contents were prepared on mild steel （1015） substrate surface by adjusting different process parameters. The surfacemorphologies and microhardnesses of the deposits were investigated by SEM and MH-6 Vickers, respectively. Adhesion strengthand friction coefficient were measured by using MFT-4000 multifunctional surface material performance instrument. The resultsshow that the deposition rate of the Ni-Cu-P-PTFE deposit increases with the increase of PTFE concentration. Further experimentsindicate that the PTFE particles co-deposited in the composite deposit will reduce the microhardhess due to their softness propertiesand loose structure. With the increasing of PTFE concentration, the adhesion strength decreases. Moreover, the addition of PTFEparticles reduces the friction coefficient, and the friction coefficient is in inverse proportion to the content of PTFE particles in thedeposits, but not to the concentration of PTFE in the bath.