超分散稳定纳米CuS的非水原位构筑及摩擦学性能

对超分散纳米粒子在润滑介质中的合成、分散和分散稳定，以及摩擦学性能进行了研究．首先设计并合成了油溶性铜盐和异氰酸酯类超分散剂；在添加油溶性铜盐和超分散剂的液体石蜡介质中，采用原位构筑方法获得了纳米CuS分散系，用冷冻蚀刻电镜对分散系进行了表征，通过离心实验对其分散稳定性进行了考察．其次利用环块摩擦试验机测定了纳米CuS分散系的摩擦学性能，并与空白油样进行了对比试验．结果表明：纳米CuS为粒径35nm左右的椭球形微粒，大小均匀，在介质中呈单粒子分散；纳米分散系经72h普通离心试验和56h非连续超离心试验均未发生相分离，表现出异乎寻常的分散稳定性；摩擦磨损试验显示超分散稳定纳米CuS的存在，可显著提高液体石蜡的承载能力和抗磨减摩性能；当纳米CuS质量分数为0．1％时，抗磨减摩性能最佳．

Nonaqueous In-Situ Synthesis and Tribological Properties of CuS Nanoparticles with Ultra-Dispersity-Stability

In-situ synthesis,dispersivity and dispersion stability and tribological properties of ultra-dispersity-stability CuS nanoparticles were studied.The oil-soluble copper salts and hyper-dispersion stabilizer were successfully synthesized.The CuS nanoparticles(n-CuS) were synthesized in-situ in liquid paraffin containing oil-soluble copper salt and hyper-dispersion stabilizer.The diameter,diameter distribution and conglomeration behavior of n-CuS in dispersion were observed by freeze-etching replication transmission electron microscopy technique.The tests of centrifuge and high speed centrifuge were used for evaluating the dispersion stability of n-CuS.The tribological properties of the lubricants with and without n-CuS were investigated by block-on-ring tribo-test, respectively.The results show that n-CuS are ellipsoid-shaped with size of about 35 nm.Nano-dispersion has a single-particle-dispersion properties,and don't come into delamination through 72 h centrifuge test and 56 h intermittent high speed centrifuge test.The friction-reduction and antiwear ability of liquid paraffin are effectively enhanced when n-CuS are added,and the best when the content of n-CuS of 0.1%.