基于磁性功能表面的磁流体润滑及其粘附行为研究

发布时间：2019-01-05 01:27

【摘要】：磁流体是一种具有超顺磁性的液态物质,主要由纳米级磁性颗粒、吸附在颗粒表面的分散剂以及基载液三部分组成。在合适的磁场作用下,磁流体可以被定位、定向和移动。基于此特性,磁流体已被成功地应用于机械旋转动密封及润滑之中。文中涉及的磁性功能表面是一种具有规则排布的微小磁性薄膜阵列表面。由于微小磁性薄膜阵列可在基体表面产生周期性梯度磁场,故本文以磁流体为润滑介质,探索其润滑特性。本文采用微细电解及电沉积技术加工出具有特定参数的磁性功能表面；随后利用电磁场分析软件对该类磁性功能表面进行静磁场分析；并以磁流体为润滑介质,对该功能表面的动/静摩擦学特性及粘附行为进行了试验研究,与无磁试样的试验结果进行了对比,其结论如下： (1)磁性功能表面在高速条件下显示出优异的减摩效果,且随着磁性薄膜厚度和面积率的增加,减摩效果越明显,而在低速条件下,磁性功能表面则表现出增摩效果；对比高速重载下的磨损情况,磁性功能表面能有效降低磨损,且随着磁性薄膜厚度和面积率的增高,其减磨效果得到适度加强。 (2)静摩擦试验分析表明,磁性功能表面与无磁试样表面相比,在轻载条件下能显著降低静摩擦系数,且随着磁性薄膜厚度和面积率的增大,静摩擦系数随之逐渐减小；而在重载条件下,磁性功能表面对静摩擦系数变化的影响不显著。 (3)在粘附特性方面,磁性功能表面能显著提高试样间的粘附力,随着磁性薄膜厚度和面积率的增高,粘附力也随之逐渐增大。
[Abstract]:Magnetic fluid is a kind of superparamagnetic liquid material, which consists of three parts: nanometer magnetic particles, dispersant adsorbed on the surface of particles and base liquid. Under the appropriate magnetic field, the magnetic fluid can be located, orientated and moved. Based on this characteristic, magnetic fluid has been successfully applied to mechanical rotating dynamic seal and lubrication. The magnetic functional surface in this paper is a small magnetic thin film array surface with regular arrangement. Because the micromagnetic thin film array can produce periodic gradient magnetic field on the substrate surface, the lubrication characteristics of the micromagnetic film array are investigated by using the magnetic fluid as the lubricating medium in this paper. In this paper, micro-electrolysis and electrodeposition techniques are used to fabricate the magnetic functional surfaces with specific parameters, and then the magnetostatic magnetic field analysis of the magnetic functional surfaces is carried out by using the electromagnetic field analysis software. The dynamic / static tribological characteristics and adhesion behavior of the functional surface were investigated by using magnetic fluid as lubrication medium, and the results were compared with those of the non-magnetic specimen. The results are as follows: (1) the magnetic functional surface exhibits excellent antifriction effect at high speed, and the antifriction effect increases with the increase of the thickness and area ratio of the magnetic film, but at low speed, the antifriction effect of the magnetic functional surface increases with the increase of the thickness and area rate of the magnetic film. On the other hand, the magnetic functional surface has the effect of increasing friction. Compared with the wear under high speed and heavy load, the magnetic functional surface can effectively reduce the wear, and with the increase of the thickness and area rate of the magnetic film, the wear reduction effect is moderately enhanced. (2) static friction test shows that the static friction coefficient of the magnetic functional surface decreases significantly under light load compared with that of the non-magnetic sample surface, and the static friction coefficient decreases gradually with the increase of the thickness and area ratio of the magnetic film. But under the heavy load condition, the influence of the magnetic functional table on the static friction coefficient is not significant. (3) in the aspect of adhesion properties, the adhesion force of the magnetic functional surface can be increased significantly. With the increase of the thickness and the area ratio of the magnetic film, the adhesion force increases gradually.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB43

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