摘 要

能源问题日益突出，因为摩擦磨损所造成的能源损耗已经占据到了相当一部分比例，为了降低发生在两接触表面的磨损带来的材料损失，耐磨涂层得到了迅速发展，其研究备受关注。聚酰亚胺具有优异的热稳定性和自润滑性，在高速、高压和高温等严苛条件下仍然具有卓越的摩擦学性能，非常适合作为高温条件下的耐磨涂层。作为固体润滑剂，二硫化钼具有优异的润滑性和耐高温性，而石墨烯具有化学结构稳定、较大的比表面积、优异的润滑性、导热性以及机械性能等。这些特殊的性质使得这两种材料被广泛用于聚合物基复合材料来提高其摩擦学性能。

为了提高上述两种固体材料的协同作用，本文采用简单的方法成功的制备出了一种中空富勒烯结构二硫化钼/石墨烯纳米复合材料（HIF-MoS₂/RGO），并将其作为填充材料，制备了一系列聚酰亚胺复合涂层。高温条件下的摩擦实验结果表明，当HIF-MoS₂/RGO含量不断增加的时候，聚酰亚胺复合涂层的磨损率和摩擦系数明显降低。与纯的聚酰亚胺涂层相比较，当HIF-MoS₂/RGO复合材料为0.6 wt%时的填充效用最佳，其摩擦系数降低了25.3%，磨痕宽度明显减小。

关键词： 摩擦磨损 聚酰亚胺 二硫化钼 石墨烯 改性

Study on Preparation and Friction Properties of High Temperature Wear Resistant Polymer Composite Coatings

ABSTRACT

Energy problems have become increasingly prominent, because the energy loss caused by friction and wear has occupied a considerable proportion, in order to reduce the material loss caused by the wear on the two contact surfaces, wear-resistant coatings have been rapidly developed, and its research has received much attention. Polyimide has excellent thermal stability and self-lubricity, and still has excellent tribological properties under severe conditions such as high speed, high pressure and high temperature, and is very suitable as an abrasion resistant coating under high temperature conditions. As a solid lubricant, molybdenum disulfide has excellent lubricity and high temperature resistance, while graphene has a stable chemical structure, a large specific surface area, excellent lubricity, thermal conductivity, and mechanical properties. These special properties make these two materials widely used in polymer matrix composites to improve their tribological properties.

In order to improve the synergistic effect of the above two solid materials, a hollow fullerene structure of molybdenum disulfide/graphene nanocomposite (HIF-MoS₂/RGO) was successfully prepared and used as a filling method. Materials, a series of polyimide composite coatings were prepared. The results of friction tests under high temperature conditions show that when the HIF-MoS₂/RGO content increases continuously, the wear rate and friction coefficient of the polyimide composite coating are significantly reduced. Compared with the pure polyimide coating, when the HIF-MoS₂/RGO composite material is 0.6 wt%, the filling effect is the best, the friction coefficient is reduced by 25.3%, and the wear scar width is significantly reduced.

KEYWORDS: Wear and Friction; Polyimide; Molybdenum disulfide; Graphene; Modify

目录

摘要 I

ABSTRACT I

目录 I

第一章 绪论 1

1.1研究背景 1

1.2聚合物摩擦学研究现状 1

1.3 聚酰亚胺研究现状 1

1.4 纳米填料 1

1.5 原位聚合法 1

1.6 本论文研究目标 1

第二章 实验部分 1

2.1 主要实验原料 1

2.2 样品的制取 1

2.2.1 富勒烯结构MoS₂/RGO纳米复合材料的制取 1

2.2.2 复合涂层制备 1

2.3 摩擦学性能测试 1

2.4 样品表征测试 1

第三章 实验结果及讨论 1

3.1 纳米材料的表征 1

3.2 高温条件下HIF-MoS₂/RGO对PI复合涂层的摩擦学性能影响 1

第四章 结论与展望 1

4.1 结论 1

4.2展望 1

参考文献 1

第一章 绪论

早在2000多年前，亚里士多德就已经提出“摩擦力”的概念，不过受限于时代条件，并未展开相应定量实验。直到15世纪，达芬奇作为第一人提及“摩擦”这一概念，他使用硬木块等材料研究了关于固体间摩擦的实验，并提出相同重量物体间的摩擦力与接触面积无关的重要结论。年，人们开始重视材料摩擦磨损和润滑的相关研究，摩擦学的研究开始兴起。1966年，英国教育科学部发表了JOST报告，建议建立前沿学科“摩擦磨损润滑学”，这份报告意义非凡，在摩擦学的研究历史里都具有里程碑式意义。摩擦学的研究对象是相对运动的物体表面之间行为，探讨在相对运动过程中相对运动物体的表面之间相互作用，以及研究其他相关的各类问题的一门学科，其主要涉及机械工程、物理学、化学、材料学、冶金学及表面学等^[1]。

1.1研究背景