权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Investigation and Verification of Potential Impacts of Third Body Nanostructure on Tribological Properties of Conventional and Unconventional Material Combinations for Automotive Braking and Risk Assessment of Particle Emission

第三体纳米结构对汽车制动传统和非常规材料组合摩擦学性能的潜在影响的调查和验证以及颗粒排放风险评估

基本信息

批准号：
190886045
负责人：
Dr.-Ing. Werner Österle
金额：
--
依托单位：
Fachbereich 5.1: Materialographie, Fraktograpie und Alterung technischer Werkstoffe
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/190886045?language=en
关键词：
Investigation Verification Potential Impacts Third

项目摘要

Our hypothesis is that smooth sliding behaviour and a constant friction level during dry sliding is determined by the formation of a granular layer from third body films which are screening the first bodies, pad and disc in case of a disc brake system. Our method to study friction processes in detail is firstly to investigate the nanostructure of third body films and secondly to understand the function of such films by modelling on the nanometre scale. Modelling will not only help to understand the fundamentals of friction but will also provide the opportunity to check the impact of different microstructures (nanostructures) and stressing conditions on the friction behaviour. The third and fourth steps will be to implement results of an optimization process done by modelling into new brake pad formulations and show that the modified system works. The goal is not only to improve properties, but also to show how environmentally critical pad ingredients can be substituted or eliminated. Besides conventional automotive brakes, based on cast iron discs, light weight brakes based on ceramic discs (unconventional) will be considered as well. Our intention is to prove the hypothesis that optimization of the system with respect to smooth sliding behaviour and minimal wear rate will result in nanostructured surface films and the emission of either single nanoparticles or small agglomerates of nanoparticles. Therefore we have planned to perform on-line particle measurements during dynamometer tests and sampling of emitted particles during certain stages of a test procedure for further nanoscopic and nanoanalytical investigations.Risk assessment of airborne particles released from brakes during dynamometer tests is planned for a second period of the project. Two important prerequisites for this enterprise are currently installed at BAM: i) preparation of a reference material and in vitro test procedure for nanotoxicological studies with living cells, and ii) construction of an exposure system for cell cultures with airborne nanoparticles.

我们的假设是，在干滑动过程中，平滑的滑动行为和恒定的摩擦水平是由第三体膜形成的颗粒层决定的，第三体膜在盘式制动系统的情况下筛选第一体、垫片和盘片。我们详细研究摩擦过程的方法是首先研究第三体薄膜的纳米结构，然后通过纳米尺度的模拟来了解这种薄膜的功能。建模不仅有助于了解摩擦的基本原理，还将提供机会来检查不同的微观结构(纳米结构)和应力条件对摩擦行为的影响。第三和第四步将是实施优化过程的结果，通过对新的刹车片配方进行建模，并显示修改后的系统有效。其目标不仅是改善性能，而且还展示了如何替代或消除对环境至关重要的衬垫成分。除了基于铸铁圆盘的传统汽车刹车外，还将考虑基于陶瓷圆盘(非传统)的轻型刹车。我们的目的是证明这样的假设，即系统在平滑滑动行为和最小磨损率方面的优化将导致纳米结构的表面薄膜和发射单个纳米颗粒或小的纳米颗粒聚集体。因此，我们计划在测功机测试期间进行在线颗粒物测量，并在测试程序的特定阶段对排放的颗粒物进行采样，以进行进一步的纳米观察和纳米分析研究。计划在项目的第二阶段对测功机测试期间从刹车释放的空气悬浮颗粒物进行风险评估。BAM目前安装了这项事业的两个重要先决条件：i)准备用于活细胞纳米毒理学研究的参考材料和体外测试程序，以及ii)建立空气中纳米颗粒细胞培养的暴露系统。