磁场环境中不同磁属性金属材料摩擦表面行为研究
发布时间：2019-05-24 07:25
【摘要】：面对日益严峻的资源、能源问题,人们对机电设备的使用寿命以及安全稳定性提出了更高的要求,服役环境对这些设备中运动部件摩擦磨损性能影响,受到越来越多科研人员的关注。随着磁技术的进步,越来越多机电设备中的摩擦副工作于磁场环境中,研究磁场对材料摩擦磨损性能的影响变得十分必要。试验在通电线圈施加磁场的条件下,以销-环配副方式,在自行改进的摩擦磨损试验机上分别研究磁场环境对铁磁性材料45钢自配副、抗磁性材料H62黄铜自配副以及45钢与H62黄铜互配副干滑动摩擦磨损性能的影响。摩擦磨损试验后利用扫描电子显微镜、X射线衍射仪、三维形貌仪以及透射电子显微镜等对磨损表面和磨屑进行表征。主要结论如下:对于铁磁性材料45钢,磁场增大摩擦系数,减小磨损率。磁场促进摩擦面和磨屑的氧化以及磨屑的细化,改变磨屑参与摩擦过程的方式,间接地提高摩擦过程中氧化磨损的比例。此外,磁场促进磨屑在摩擦接触面间形成隔离层,避免摩擦面的直接接触,从而改变铁磁性材料的摩擦磨损性能。对于抗磁性材料H62黄铜以及45钢环-H62黄铜销互配副,磁场增大摩擦系数以及磨损率。磁场对抗磁性材料H62黄铜摩擦面和磨屑的氧化以及磨屑的粒度大小没有明显影响,且磁场对抗磁性材料有一种斥力的作用,促进抗磁性磨屑脱离摩擦面,使得摩擦面的接触更加直接,从而增大抗磁性材料的摩擦磨损。对于铁磁性材料45钢,有磁场时,磨损率减小,摩擦接触面间磨屑增多;利用压缩空气去除磨屑时,材料磨损率增大。干摩擦过程中,摩擦接触面间存在的适量磨屑是整个摩擦系统自我调节的结果,改变摩擦副摩擦接触面间的磨屑数量会直接影响到材料的摩擦接触状态,从而影响材料的摩擦磨损性能。磁场对材料摩擦磨损性能的影响与材料的磁属性有关,磁场有利于提高铁磁性材料的耐磨性而降低抗磁性材料的耐磨性。
[Abstract]:In the face of increasingly serious problems of resources and energy, people put forward higher requirements for the service life and safety and stability of mechanical and electrical equipment. The service environment has an impact on the friction and wear performance of moving parts in these equipment. More and more researchers pay attention to it. With the development of magnetic technology, more and more friction pairs in mechanical and electrical equipment work in magnetic field environment, so it is necessary to study the influence of magnetic field on the friction and wear properties of materials. Under the condition of applying magnetic field to the electrified coil, the self-matching pair of ferromagnetic material 45 steel in magnetic field environment was studied on a self-improved friction and wear testing machine by means of pin-ring matching. Effect of anti-magnetic material H62 brass self-matching pair and dry sliding friction and wear properties of 45 steel and H62 brass pair on dry sliding friction and wear properties of anti-magnetic material H62 brass self-matching pair and 45 steel and H62 brass matching pair. After friction and wear test, scanning electron microscope, X-ray diffractometer, three-dimensional topography instrument and transmission electron microscope were used to characterize the worn surface and debris. The main conclusions are as follows: for ferromagnetic material 45 steel, the magnetic field increases the friction coefficient and reduces the wear rate. The magnetic field promotes the oxidation of friction surface and debris and the refinement of debris, changes the way in which the debris participates in the friction process, and indirectly increases the proportion of oxidation wear in the friction process. In addition, the magnetic field promotes the formation of isolation layer between the friction contact surfaces and avoids the direct contact of the friction surface, thus changing the friction and wear properties of ferromagnetic materials. For the antimagnetic material H62 brass and 45 steel ring-H62 brass pin pair, the magnetic field increases the friction coefficient and wear rate. The magnetic field has no obvious effect on the friction surface and debris oxidation of H62 brass and the particle size of the debris, and the magnetic field has a repulsive effect on the magnetic material, which promotes the anti-magnetic debris to detach from the friction surface. The contact of the friction surface is more direct, thus increasing the friction and wear of the diamagnetism material. For ferromagnetic material 45 steel, the wear rate decreases and the wear debris between friction contact surfaces increases when there is a magnetic field, and the material wear rate increases when compressed air is used to remove the debris. In the process of dry friction, the proper amount of debris between the friction contact surfaces is the result of the self-adjustment of the whole friction system. Changing the number of debris between the friction contact surfaces of the friction pair will directly affect the friction contact state of the material. Thus, the friction and wear properties of the material are affected. The effect of magnetic field on the friction and wear properties of materials is related to the magnetic properties of materials. Magnetic field is beneficial to improve the wear resistance of ferromagnetic materials and reduce the wear resistance of diammagnetic materials.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG115.58
[Abstract]:In the face of increasingly serious problems of resources and energy, people put forward higher requirements for the service life and safety and stability of mechanical and electrical equipment. The service environment has an impact on the friction and wear performance of moving parts in these equipment. More and more researchers pay attention to it. With the development of magnetic technology, more and more friction pairs in mechanical and electrical equipment work in magnetic field environment, so it is necessary to study the influence of magnetic field on the friction and wear properties of materials. Under the condition of applying magnetic field to the electrified coil, the self-matching pair of ferromagnetic material 45 steel in magnetic field environment was studied on a self-improved friction and wear testing machine by means of pin-ring matching. Effect of anti-magnetic material H62 brass self-matching pair and dry sliding friction and wear properties of 45 steel and H62 brass pair on dry sliding friction and wear properties of anti-magnetic material H62 brass self-matching pair and 45 steel and H62 brass matching pair. After friction and wear test, scanning electron microscope, X-ray diffractometer, three-dimensional topography instrument and transmission electron microscope were used to characterize the worn surface and debris. The main conclusions are as follows: for ferromagnetic material 45 steel, the magnetic field increases the friction coefficient and reduces the wear rate. The magnetic field promotes the oxidation of friction surface and debris and the refinement of debris, changes the way in which the debris participates in the friction process, and indirectly increases the proportion of oxidation wear in the friction process. In addition, the magnetic field promotes the formation of isolation layer between the friction contact surfaces and avoids the direct contact of the friction surface, thus changing the friction and wear properties of ferromagnetic materials. For the antimagnetic material H62 brass and 45 steel ring-H62 brass pin pair, the magnetic field increases the friction coefficient and wear rate. The magnetic field has no obvious effect on the friction surface and debris oxidation of H62 brass and the particle size of the debris, and the magnetic field has a repulsive effect on the magnetic material, which promotes the anti-magnetic debris to detach from the friction surface. The contact of the friction surface is more direct, thus increasing the friction and wear of the diamagnetism material. For ferromagnetic material 45 steel, the wear rate decreases and the wear debris between friction contact surfaces increases when there is a magnetic field, and the material wear rate increases when compressed air is used to remove the debris. In the process of dry friction, the proper amount of debris between the friction contact surfaces is the result of the self-adjustment of the whole friction system. Changing the number of debris between the friction contact surfaces of the friction pair will directly affect the friction contact state of the material. Thus, the friction and wear properties of the material are affected. The effect of magnetic field on the friction and wear properties of materials is related to the magnetic properties of materials. Magnetic field is beneficial to improve the wear resistance of ferromagnetic materials and reduce the wear resistance of diammagnetic materials.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG115.58
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