Thermal Effects of Friction and Wear Performances of PMMA/Graphite Nano-Composite

• Main Authors: Chun-Yi Li, 李春義
• Other Authors: Sy-Wei Lo
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/59021214810873345498

碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 97 === The main purpose of this thesis in order to discuss PMMA/Graphite nano-composites, observe the effects of different amount of graphite and different parameters on the coefficient of friction and wear rate. First by the pin-on-disk wear tribometer with different load, speed, temperature, to progress wear experiment, and observe the macroscopic characteristic of wear. Then use the nano indenter, to carry on the scratch test with the low speed, different load, and research the microscopic characteristic of scratch. From the experiment results, we find the addition of graphite contributes to improve the wear characteristic of acrylic. The highest content of 5% set by this thesis among them has the best improvement effect. When the temperature is higher than 50℃, the coefficient of friction of the test piece under 3% content of graphite becomes rather unsteady. We presume the graphite content to be lower, not enough to improve the heat characteristic of acrylic, and the sliding friction of contact surfaces creates the heat energy, causing the temperature gone up, and making the material soften. On the contrary reduces the characteristic of wear. And under the high temperature of 75 ℃, the test piece of 5% content of graphite, the coefficient of friction is relative stability. It is shown that the graphite content of 5% is good enough to improve the heat characteristic of acrylic. So the nano composite material of the acrylic/graphite needs to adjust the graphite content percentage depending on its usage situation. If using under the situation of low speed and low temperature, only needing to addition a little amount of graphite can improve the wear characteristic; and then must increase its graphite content under the situation of high speed and high temperature.