Dissertation > Excellent graduate degree dissertation topics show

Study on Lubrication Performance of Magnetic Fluid with Magnetic Surface Texture

Author: ShenCong
Tutor: WangXiaoLei
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical Design and Theory
Keywords: Magnetic fluid Magnetic surface texture Lubricating Friction Wear and tear Microfabrication
CLC: TH117.2
Type: Master's thesis
Year: 2010
Downloads: 66
Quote: 1
Read: Download Dissertation

Abstract

The magnetic liquid is a novel magnetic functional materials, both with a general soft magnetic properties of the magnet, and having a flow of the liquid. Lubrication is an important application area of ??the magnetic fluid. When using a magnetic liquid lubrication, by the outer magnetic field can be lubricating fluid retained in the friction area, improve the lubricating effect. And through rational design of the magnetic field, the lubricating fluid seal and the effect of increasing the bearing capacity of the lubricating film can play. Based on the above advantages, the paper focuses on the lubricating properties of the magnetic fluid and magnetic field design, explore and study. First study the magnetic liquid outer magnetic field under static bearing capacity and lubrication properties, verify its advantages as a lubricant. Then lubricated for the magnetic fluid is proposed a novel magnetic surface texture design. Most of the existing surface texture concern of the geometric parameters of the impact, and the texture in addition to containing a traditional geometric surface texture also the introduction of the role of the magnetic field. Realized on the metal surface preparation of magnetic surface texture of this study by microfabrication techniques. Then, the texture of the sample on the magnetic surface of the magnetic fluid lubrication conditions tribological properties were evaluated. By contrast no texture under the same conditions and the general texture tribological properties of the sample, the analysis of the effect and mechanism of magnetic surface texture for magnetic fluid lubrication. Finally, from the selection of the magnetic fluid and magnetic surface texture of the angle of the geometric parameters of the magnetic fluid lubrication magnetic surface texture design optimization studies, analysis the magnetic liquid saturation magnetization and the magnetic surface area ratio of the texture of the tribological properties the impact. Study the following conclusions: first, the role of the external magnetic field, the magnetic fluid has a certain carrying capacity. In the same under the action of an external magnetic field, a high saturation magnetization of the magnetic fluid, the static bearing capacity. The outer magnetic field, with appropriate saturation magnetization of the magnetic fluid can be significantly reduced friction and reduced wear. Second, the use of the photolithographic mask electrolytic combination electrodeposition method can prepare a magnetic surface of the metal surface texture. Using a magnetic liquid lubricant, magnetic surface texture conducive to adequate lubrication is formed in the low speed under the condition, thereby effectively reducing friction and wear. Magnetic surface texture will be generated in the high-speed conditions, to increase the effect of friction. Third, the texture area ratio of the saturation magnetization and the magnetic surface of the magnetic fluid will affect the tribological properties of the sample. Considering each of the speed - the experimental results under load conditions, the saturation magnetization of 16kA / m of the magnetic liquid is the preferred lubricating liquid, and the optimum range of the texture area ratio is 5% to 10%.

Related Dissertations

CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanics (mechanical design of the basic theory ) > Mechanical friction, wear and lubrication > Lubricating
© 2012 www.DissertationTopic.Net Mobile