Creation and Tribology of Extremely Low Friction Super Lattice Solid Lubricant Films

1.纳米周期多层固体润滑膜的研制：为了研制低摩擦、长寿命的固体润滑膜，研究了纳米周期多层膜提高硬度的机理，提出了新型固体润滑膜的模型。为了降低摩擦系数和增加硬度，在使用具有低剪切阻力的材料制备纳米周期多层膜之后，在我们的工作中合成的新纳米周期固体润滑剂膜表现出极低的摩擦，而通常的简单膜和混合膜材料不具有这种上级摩擦性能。具体而言，这些规定如下。(1)制备了纳米周期的碳、硼固体多层膜：（C/BN）n多层膜，其周期为几个纳米，耐热性得到了显著提高。已经证实，4 nm周期的多层膜表现出最低的摩擦系数，可忽略的D ...更多信息 在200 ℃的高温磨损试验中，与其它多层膜相比，该多层膜具有良好的耐磨性和上级耐磨性。(2)导电性Au和Ag纳米周期多层膜：由于导电性纳米周期多层固体润滑膜是使用Au和Ag逐层沉积的，因此它们具有极低的摩擦系数和优异的上级耐磨性，即4 nm周期多层膜显示出低摩擦系数，μ= 0.05，并且其耐磨性显著提高。另一方面，纳米周期多层膜的电阻率的变化小于那些简单的层膜后的滑动测试。也就是说，可以制备具有稳定电阻率的上级固体润滑剂膜。(3)纳米周期二硫化钨和二硫化钨多层膜：我们合成的纳米周期二硫化钨和二硫化钨多层膜，即使在58%湿度条件下，其摩擦系数也低至μ= 0.04。此外，在重复磨损试验中评估的它们的耐磨性是简单膜的6倍以上。(4)实现纳米级加工：由于避免了多层膜上各层的缺陷延展性，因此可以在每层中进行纳米级加工。2.纳米复合薄膜：在三维纳米复合材料的基础研究中，制备了含金属的类金刚石薄膜，并通过纳米压痕和微磨损试验研究了其摩擦学性能。含Ti类金刚石薄膜具有良好的上级力学性能。金属的加入改善了合金的边界润滑性能。特别地，含Ti的DLC膜显示出小于0.04的低摩擦系数。该薄膜的上级摩擦学性能具有显著的潜力，有望实现该上级润滑耐用薄膜在汽车滑动部件中的应用，并有望在超低摩擦环境下良好工作。少

1. Development of nano-period multilayer solid lubricant films: To develop the solid lubricant films with a much lower friction and a longer life, the mechanism of improving the hardness of nano-period multilayer films was investigated and the model of novel solid lubricant films was proposed. In order to reduce a friction coefficient and increase a hardness, after the preparation of nano-period multilayer films using materials with low shear resistances, new nano-period solid lubricant films synthesized in our works exhibit extremely low frictions, whereas usual simple film and mixed film materials do not have such superior friction properties. Concretely, those are specified as follows.(1) Nano-period carbon and boron solid multilayer films: (C/BN)n multilayer films with periods of several nanometers were prepared and their heat resistances were expectedly improved. It has been confirmed that the 4-nm-period multilayer film exhibits the lowest friction coefficient., the neglectable d … More estruction and the superior wear resistances investigated in the wear test at a high temperature of 200^oC as compared with other multilayer films. (2) Electro-conducive An and Ag nano-period multilayer films: Since electro-conducive nano-period multilayer solid lubricant films were deposited using Au and Ag by layers, they are provided with a extremely low friction coefficient and superior wear durability, i.e. the 4-nm-period multilayer film indicates a low friction coefficient as μ= 0.05 and its wear durability was significantly improved. On the other hand, the changes of the electrical resistivity of the nano-period multilayer films are less than those of simple layer films after the sliding test. That is to say, it is possible to prepare superior solid lubricant films with steady electrical resistivity. (3) Nano-period tungsten disulfide and molyddenum disulfied multlilayer films: For those of nano-period multilayer films such as MoS_2 and WS_2 synthesized in our studies, their friction coefficient is as low as μ= 0.04 even under a condition of 58% humidity. Moreover, their wear durability evaluated in the repetitive wear tests is over 6 times longer than that of simple films. (4) Realization of nano-scale processing: As a result of deterring from the defect ductlility of layers on multilayer films, it becomes possible to carry out nano-scale processing in each layer.2. Nano-composite thin films: In the basic researches of the three dimensional nanocomposite, metal containing DLC (diamond like carbon) films were deposited and their tribological properties were evaluated in the nanoindentation and microwear tests. The Ti containing DLC film shows superior micromechanical properties. The boundary lubrication properties were improved by the metal addition. In particularly, the Ti containing DLC film shows the low friction coefficient less than 0.04. The superior tribological property of the film has significant potential and it is possible to realize the application of the superior lubricant and durable films in automobile sliding parts which can be expected to work well under a super low friction environment. Less