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Thermo-Elastohydrodynamics of Coated Polymer Gears

涂层聚合物齿轮的热弹流体动力学

基本信息

批准号：
391059617
负责人：
Professorin Dr.-Ing. Kirsten Bobzin
金额：
--
依托单位：
Institut für Oberflächentechnik (IOT)
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/391059617?language=en
关键词：
Thermo Elastohydrodynamics Coated Polymer Gears

项目摘要

Climate change, the depletion of scarce resources, strict carbon emission allowances and e mobility are challenges that result in a constantly increasing demand for efficient machines and systems. Lightweight designs made from engineering polymers are one very promising approach to tackle these challenges at a minimum of costs through large-scale production possibilities. However, their capabilities in high-performance power-transmitting machine elements such as gears are mainly limited by lower material strength and thermal stability compared to common metal designs of tribological systems. The comprehension of polymer tribosystems and its mechanisms, especially related to heat management, offers great potential to extend the application limits of engineering polymers. Moreover, recent developments in surface coating technology show ways for expanding capabilities of engineering polymers that increase functional density of such machine elements tremendously. Hence, the goal of this confraternal research proposal is to explore the thermo-elastohydrodynamic lubrication (TEHL) of thermoplastics and the potentials of surface coatings in these TEHL contacts in order to improve its tribological performance. Thereby, polyamide (PA6.6) and Polyetheretherketone (PEEK), both pure and reinforced, are used in steel-thermoplastic pairings (main contact setup) and plain thermoplastic pairings (complementary contact setup). Three stages are defined that lead through the project. At first, the tribological performance and load limits of uncoated thermoplastic TEHL contacts are determined. Concurrently, innovative coating systems are designed for the needs - inter alia based on graded zirconium carbide (ZrCg) and chromium-aluminum-nitride ((Cr,Al)N). Second, the previous investigations are conducted in a similar fashion on coated setups to reveal its benefits. Comprehension of the mechanical and thermal mechanisms involved in coated and uncoated thermoplastic TEHL contacts is ensured by comprehensive tribosimulations. Finally, the gained knowledge is transferred from model contacts to gear contacts and assessed for industrial applications.The systematic approach of this project allows determination of the performance and limiting factors in uncoated thermoplastic TEHL contacts as well as the benefits of coating technology in such contacts, which is essential for improving the capability of engineering polymers for power transmitting machine elements.

气候变化、稀缺资源的枯竭、严格的碳排放限额和电子机动性是导致对高效机器和系统的需求不断增加的挑战。由工程聚合物制成的轻量化设计是一种非常有希望的方法，通过大规模生产的可能性，以最低的成本应对这些挑战。然而，与摩擦学系统中常见的金属设计相比，它们在高性能动力传递机械元件(如齿轮)中的能力主要受到材料强度和热稳定性较低的限制。对聚合物摩擦体系及其机理的理解，特别是与热管理相关的机理，为扩大工程聚合物的应用范围提供了巨大的潜力。此外，表面涂层技术的最新发展显示了扩展工程聚合物的能力的方法，从而极大地提高了此类机械元件的功能密度。因此，这项联合研究计划的目标是探索热塑性塑料的热弹流润滑(TEHL)及其表面涂层的潜力，以改善其摩擦学性能。因此，聚酰胺(PA6.6)和聚醚醚酮(PEEK)，无论是纯的还是增强的，都被用于钢-热塑性配对(主接触设置)和普通热塑性配对(补充接触设置)。定义了贯穿整个项目的三个阶段。首先，确定了未涂覆热塑性TEHL触头的摩擦学性能和载荷极限。同时，根据需要设计了创新的涂层系统--特别是基于分级碳化锆(ZrCg)和铬铝氮化物((CrAl)N)的涂层系统。其次，以前的调查是以类似的方式对涂层设置进行的，以揭示其好处。通过全面的摩擦模拟，确保了对涂层和非涂层热塑性TEHL接触所涉及的机械和热机制的理解。最后，将获得的知识从模型触点转移到齿轮触点，并对工业应用进行评估。该项目的系统方法允许确定未涂覆的热塑性TEHL触点的性能和限制因素，以及在此类触点中涂层技术的好处，这对于提高工程聚合物用于动力传输机械元件的能力至关重要。