Research on High Performance Surface Modified Layer with Dispersed Fine Particles

为了提高表面改性层的摩擦学性能，研究了分散颗粒、分散沉淀和陶瓷颗粒喷涂三种表面改性方法.在高真空无润滑条件下进行了滚柱和环盘摩擦磨损试验，研究了颗粒弥散复合镀层的摩擦学性能。用有限元法分析了分散颗粒的弹性模量对应力的影响。镀层中的最大Von Mises应力值随颗粒含量的增加而增大，随颗粒弹性模量的减小而减小。计算得到的应力场能够很好地解释实验中得到的磨损行为.采用双辊滚动接触疲劳试验机，在油润滑条件下，研究了喷涂氧化铝陶瓷的滚动接触疲劳性能。用二维有限元法计算了地下剪应力。正交剪切应力和最大剪切应力的最大值出现在 ...更多信息 在喷涂层中。观测到的亚表面裂纹深度一般都比剪应力最大值的深度深.采用环-盘摩擦磨损试验机研究了弥散析出相不锈钢在空气和真空中的油润滑和无润滑条件下的摩擦磨损特性。弥散析出相改善了不锈钢的摩擦磨损性能.在高真空无润滑条件下进行了齿轮试验和双缸试验。而PTFE颗粒弥散分布的Ni-P镀层齿轮，磨损沿齿廓沿着分布基本均匀，动载荷波动较小。双圆柱试验的磨损量远小于齿轮试验的磨损量，但两种试验的平均摩擦系数有很好的相关性，这一结果可为设计最佳的表面改性层厚度和分散粒子提供依据。少

In order to improve the tribological performance of surface modified layer, dispersed particles, dispersed precipitations and ceramics particles spraying were investigated.1. Roller and ring/disk tests were carried out under non-lubricating condition in high vacuum to investigate the tribological performance of particle dispersed composite platings. The influence of elastic modulus of dispersed particles on stresses was investigated with FEM analysis. The maximum values of Von Mises stress in the plated layer increased with increasing particle content and with decreasing elastic modulus of particles. The wear behavior obtained in the experiment could be well explained by the calculated stress field.2. The rolling contact fatigue of a sprayed alumina ceramics was studied with a two-roller test apparatus with oil lubricant. The subsurface shear stresses were calculated with two-dimensional FEM analyses. The maximum values of orthogonal shear stress and maximum shear stress occurred withi … More n the sprayed layer. The depths of observed subsurface cracks were generally deeper than those of the maxima of shear stresses.3. The friction and wear characteristics of stainless steel with dispersed precipitations were investigated with ring-on-disk test apparatuses under oil lubricating condition and non-lubricating condition in air and in vacuum. The friction and wear performances of stainless steel were improved by dispersed precipitations.4. A gear test and a two-cylinder test were carried out under non-lubricating condition in high vacuum. In case of the Ni-P plated gear with dispersed PTFE particles, the wear was almost uniform along the tooth profile and the fluctuation of the dynamic load was small. Though the wear in the two-cylinder test was much smaller than that in the gear test, there is a good correlation of the average friction coefficients between the two tests.These results were useful to design the optimum thickness and dispersed particles of surface modified layer. Less