Karlsruhe, Germany
Karlsruhe, Germany

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Berlet P.,IAVF Antriebstechnik GmbH | Dienwiebel M.,Fraunhofer Institute for Mechanics of Materials | Dienwiebel M.,Karlsruhe Institute of Technology | Scherge M.,Fraunhofer Institute for Mechanics of Materials | Scherge M.,TU Ilmenau
Wear | Year: 2010

Friction and wear can be influenced not only by materials, lubricants and running-in, but also by the final manufacturing step employed to prepare the samples. A suitable surface finish for a metallic tribological system can be achieved by cutting procedures such as lapping, honing or grinding. In addition to topography changes, the finishing process also modifies the chemical composition as well as the crystalline structure of the near-surface material. In this contribution the impact of finishing on friction and wear during running-in and the subsequent operation is evaluated for the grinding process. Different grinding parameters and coolant compositions were applied to generate samples for continuous and high-resolution pin-on-disk friction and wear tests. The experiments showed a significant correlation between grinding force, friction coefficient and wear rate. © 2010 Elsevier B.V. All rights reserved.

Gergye T.,Széchenyi István University | Dreyer M.R.,Széchenyi István University | Kehrwald B.,IAVF Antriebstechnik GmbH | Optatzy W.,IAVF Antriebstechnik GmbH
Lecture Notes in Electrical Engineering | Year: 2013

The aim of this study is the analysis of wear behaviour of a timing chain in real engine operation in terms of the influence of variable operating parameters. Further experiments were carried out with used motor oil. During the wear measurements could be seen, that the variation of the oil temperature showed a minor effect on the wear behaviour. However the use of aged oil showed a significant change of the wear behaviour. This means, that in the design of chain drive systems and oil change intervals this correlation has to be considered for maintaining the targeted engine life. Fundamental experiments on a tribometer using different types of carbon black oil will help to describe this phenomena more accurately. © 2013 Springer-Verlag Berlin Heidelberg.

Berlet P.,IAVF Antriebstechnik GmbH | Dienwiebel M.,Fraunhofer Institute For Werkstorimechanik | Kehrwald B.,IAVF Antriebstechnik GmbH | Scherge M.,Fraunhofer Institute For Werkstorimechanik
Tribologie und Schmierungstechnik | Year: 2010

Friction and wear can be affected not only by materials, lubricants and the running-in, but also by final cutting processes such as grinding, honing or lapping. Except for changes of topography the cutting procedure leads also to changes of the chemical composition as well as of the crystalline structure of the near-surface material. By suitable choice of the tool, process parameters and coolant critical defect structures are avoided and a surface conditioning can be achieved. During running-in such an optimal regime enables high friction power input, mechano-chemical intermixing of the near-surface material as well as the generation of nano-crystalline structures. This results in low friction and wear during running-in and subsequent operation.

Beriet P.,IAVF Antriebstechnik GmbH | Knapp A.,IAVF Antriebstechnik GmbH | Brink A.,Fraunhofer Institute for Mechanics of Materials | Scherge M.,Fraunhofer Institute for Mechanics of Materials | And 6 more authors.
Tribologie und Schmierungstechnik | Year: 2015

Within the BMBF-program "Werkstoffinnovationen für Industrie und Gesellschaft - WING" pursued the cluster-project "NanoFerro - Motorblöcke für Hochlastanwendungen" the aim to apply a functional coating of nanocrystalline iron in cylinder liners of aluminum crankcases with an electrolytic deposition method as well as to analyze their functional properties. Key aspects were the development of optimal terms of deposition by pulse-plating as well as a substantial characterization of the electro-plated thin iron layer with regard to material scientific aspects. Furthermore tribological analyses were carried out in a ring/cylinder tribo-tester, in a single-cylinder engine and in a complete engine.

This thesis will explain the theoretical procedural principle of ion implantation as an alternative to conventional thin layer activation for therefore not suitable materials. The workability is shown using the example of a radiolabeled plain bearing bush with PTFEbased sliding layer. The wear measurement using the concentration measuring method on a bearing test bench followed.

Berlet P.,IAVF Antriebstechnik GmbH | Dilbat M.,IAVF Antriebstechnik GmbH | Pohlmann K.,IAVF Antriebstechnik GmbH | Kuse S.,IAVF Antriebstechnik GmbH
Tribologie und Schmierungstechnik | Year: 2014

The mechanical losses of combustion engines caused by friction and the auxiliaries are the largest category of single losses. This thesis will explain the possibilities and limits to decrease fuel consumption of combustion engines by friction reduction furthermore.

Pohlmann K.,IAVF Antriebstechnik GmbH
17th International Colloquium Tribology 2010 - Solving Friction and Wear Problems | Year: 2010

We studied the formation of tribological induced films and surface layers under lubricated conditions using a fully formulated engine oil with and without dedicated antiwear (AW) additives in a pin on disk tribometer. Experiments were performed by using different run times. Coefficient of friction and wear were measured simultaneously and continuously using the highly resolving continuous wear measurement technique (RNT). The micro topography of the sliding surfaces was analysed after the experiments by means of white light interferometry and atomic force microscopy, the chemical composition and the micro structure by using auger electron spectroscopy and focussed ion beam analysis, respectively. The experimental results show that films are formed initially on the nascent metal surface and in the evolution get mixed into the near surface volume. These mechanisms strongly affect the tribological behaviour with respect to the coefficient of friction and wear rates. Furthermore, a distinct behaviour for different energetic situations is found for formulations with and without AW additives.

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