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Influence of Transfer Film Formation Mechanisms on the Friction and Wear of Polymer Matrix Composites

转移膜形成机制对聚合物基复合材料摩擦磨损的影响

基本信息

批准号：
389811744
负责人：
Dr.-Ing. Bernd Wetzel
金额：
--
依托单位：
Leibniz-Institut für Verbundwerkstoffe (IVW)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/389811744?language=en
关键词：
Influence Transfer Film Formation Mechanisms

项目摘要

Previous studies performed during the last two years revealed the capability of silica nanoparticles towards forming a wear-resistant film at a specific pv-load range which overcomes the unacceptable macroscopic wear of the conventional composite without nanofiller. Furthermore, it was observed that a certain roughness of the counterbody and minimum pv-load is essential for obtaining well adhering transfer films of the desired structure and properties. These well adhering transfer films are made of almost exclusively nanofillers.Our hypothesis is that filler size and counterbody roughness should be of the similar magnitude in order to obtain optimum conditions for in situ generating protecting films. If this consideration is right, an optimum surface topography applies for each filler size. Furthermore, by applying higher loads in the running-in regime, it is possible to generate protecting films that can be used in lower loads afterwards. Finally, due to the fact that almost no matrix material is in transfer film, the formation mechanisms of this well adhering transfer film might be transferable to other polymers. The main goal of the new proposal is to prove these hypotheses by experimental and numerical approaches while also fundamentally investigating transfer film properties such as film thickness and distribution.For the experimental approach, silica particles in the size range 50, 250, and 1000 nm will be synthesized and used in polymer composites, while appropriate surface structuring will be performed by laser treatment. Multimodal particle size distribution will be considered as well, e.g. the combination of 50 nm and 250 nm sized particles in one specific composite. Target is to derive influences of particle size and surface topography on the formation mechanisms of the resultant transfer films. In the second series of tests, the influence of the load history test under both increasing and decreasing pv-loads are conducted. The objective is to utilize the results to create well adhering transfer films in the running-in regime, and for lower loads in the steady-state regime afterwards. Finally, by replacing the epoxy matrix for a thermoplastic matrix, the transferability of the so far identified transfer film formation mechanisms is investigated. The results will have a major impact on customizing well defined tribological properties according to demands.Tribofilm formation modelling will be performed by the movable cellular automata method. The automata size will be varied in the same range as the silica particle size (50 to 1000 nm, multimodal). Loads and the roughness of the counterpart surface will be adjusted accordingly.

过去两年的研究表明，二氧化硅纳米颗粒能够在特定的光伏负载范围内形成耐磨膜，克服了传统复合材料在没有纳米填料的情况下不可接受的宏观磨损。此外，观察到一定的对应体粗糙度和最小的光伏负载是获得所需结构和性能的良好附着力转移膜的关键。这些附着力良好的转移膜几乎都是由纳米薄膜构成的，我们的假设是，为了获得原位生成保护膜的最佳条件，填充物的尺寸和对应体的粗糙度应该是相似的。如果这一考虑是正确的，则适用于每种填料尺寸的最佳表面形貌。此外，通过在磨合状态中施加较高的负载，可以产生可在随后的较低负载中使用的保护膜。最后，由于转移膜中几乎没有基质物质，这种附着性良好的转移膜的形成机理可能也可以转移到其他聚合物上。新方案的主要目标是通过实验和数值方法证明这些假设，同时从根本上研究转移膜的性质，如膜厚度和分布。对于实验方法，将合成尺寸在50、250和1000 nm的二氧化硅颗粒并用于聚合物复合材料，而适当的表面结构将通过激光处理进行。还将考虑多峰颗粒尺寸分布，例如将50 nm和250 nm大小的颗粒组合在一个特定的复合材料中。目的是得到颗粒大小和表面形貌对所得转移膜的形成机理的影响。在第二组试验中，进行了增加和减少PV荷载下的荷载历史试验的影响。目的是利用这些结果在磨合状态下形成附着力良好的转移膜，并在之后的稳态状态下产生较低的载荷。最后，通过用环氧基取代热塑性基团，研究了目前已知的转移膜形成机理的可转移性。结果将对根据需求定制定义良好的摩擦学特性产生重大影响。摩擦膜的形成将使用可移动元胞自动机方法进行模拟。自动机的大小将在与二氧化硅颗粒大小相同的范围内变化(50到1000 nm，多峰)。载荷和对应表面的粗糙度将相应调整。