弹性孔胞体的孔-液挤压效应及其润滑控制机理研究

The used life of the parts couldn’t be predicted well due to the uncertainness of the lubrication conditons in the elastic cells with porous surface, and it will easilly cause the engineering accidents. The academic thoughts of the pore-liquid squeeze effect that controlling the lubrication conditions of the elastic cells with porous surface, which is to be presented based on the uncertainess of the oil-film thickness on the porous surface in the elastic cells. The inner linkness between the pore-liquid squeeze effec and the lubrication controll will be investigated by the study on the surface structure characteristics of the elastic porous cell, its poro-liquid squeeze effect and its oil-film forming conditions, and this is helpful to innovate the new prediction of lubrication conditions and its new control methods. The correlation of the lubrication conditions of elastic porous cell, the material elastic parameters, the pore structure parameters and its pore-liquid squeeze effect will be obtained. The predicted model of the lubrication conditions of elastic porous cell with regarding the pore structure parameters as the independent variable will be developed. The contents as following will be studied: 1)The surface fractal model of the characterization pore structure parameters of elastic porous cell will be built up; 2) The interaction mechanisms between the deformation characteristics of elastic porous cell caused by the load and its pore-liquid squeeze effect will be studied; 3) The picture description curves and its predicted coupling model of the load parameters, the constructure parameters of porous surface and the oil-film thickness will be built up;4)The continuity of lubricating film on the porous surface of elastic porous cell and its working conditions adaptability. The research can provide the theoretical foundations for the structure design of solid-liquid bionic cell and life prediction as well as lubrication control of oil bearing.Moreover, the application range of elastic porous cell with oil porous lubricant can be broaden.

多孔表面弹性体润滑状态的不确定性使零件使用寿命难以预测易引起工程隐患，本项目将基于其表面膜厚的不可预测性，提出以孔-液挤压效应控制其润滑状态的学术思想。拟通过弹性孔胞体表面结构特征、孔-液挤压效应与成膜条件的研究，揭示其孔-液挤压效应与润滑控制之间的内在联系，以创新出其润滑状态预测及控制新方法。研究将揭示弹性孔胞体的材料弹性参数、孔结构参数、孔-液挤压效应与润滑状态之间的相关性，建立以孔结构参数为自变量的润滑状态预测模型。研究涉及：1)建立表征孔胞体孔结构参数的表面分形模型；2)基于载荷下孔胞体结构形变特征与其孔-液挤压效应之关联机理研究；3)建立预测孔胞体润滑状态的载荷参数、孔表结构参数与膜厚之耦合模型及其图解曲线；4)孔胞体多孔表面膜连续性与工况适应性研究。研究可为固-液孔胞体孔结构设计及弹性孔胞含油轴承寿命预测与润滑控制提供理论基础；可拓宽弹性孔胞含油孔质体的工程范畴。

弹性固-液孔胞体是由有序多孔金属基体及其润滑储液组成的固-液双相复合体，有效解决了润滑涂层存在的润滑与耐磨性相互制约的矛盾；项目以弹性孔胞体的孔-液挤压润滑效应及其控制机理研究为主旨，开展了以下工作：.为了探讨弹性固-液孔胞润滑材料的孔胞结构和复合材料性能，基于微观结构测试分析和多尺度理论，建立了其弹性固-液双相复合体表征模型，利用Mori-Tanaka方法预测了其复合弹性模量，并验证了模型的有效性。建立了其弹性孔胞体孔-液挤压润滑预测模型，研究为弹性孔胞体的润滑控制提供理论基础和技术依据。.基于TiB2-FeCrWMoV微孔胞体金属陶瓷材料基体，揭示了其摩擦系数随TiB2含量增加而减小，同时随温度的升高和相对滑动速度的增加显著降低。以Sn-Ag-Cu系低熔合金为固体润滑剂，通过该弹性孔胞金属陶瓷材料与2Cr13钢盘及Al2O3陶瓷盘及Si3N4陶瓷盘配副时高温摩擦磨损试验，揭示了其在高温下的孔-液挤压润滑效应和连续膜成膜润滑机理。.将TiO2硅油纳米胶体采用真空/压力浸渍工艺技术浸渍到弹性孔胞体金属基体中，重构出新TiO2硅油-弹性孔胞体金属陶瓷自润滑材料，通过高温摩擦磨损试验发现存储在弹性孔胞体金属陶瓷中纳米胶体中的TiO2纳米颗粒释放到摩擦表面，避免了摩擦副直接接触且实现了其表面的减摩抗磨特性。.为了揭示弹性孔胞体金属润滑材料的工况适应性及其孔-液挤压润滑机理，制备了Sn-Ag-Cu/弹性孔胞体金属陶瓷的自润滑滚动体，通过高温摩擦磨损试验，分析了孔-液挤压下油膜润滑控制的影响因素及其对局域润滑膜的完整性和连续性的影响规律。.基于同/异弹性模量材料匹配对推力球轴承有油膜时的弹性挤压特性的影响因素规律，研究了材料性能参数匹配对弹性球轴承挤压油膜特性的影响研究。.本研究为实现弹性固-液孔胞体的孔-液挤压润滑可控性，改善其润滑稳定性与可靠性，可拓宽其孔质含油胞体摩擦副的寿命预测和润滑控制，具有重要的理论意义与工程价值。