Bremen, Germany
Bremen, Germany

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Schulz J.,WISURA GmbH | Decker B.,WISURA GmbH | Rehbein W.,Rhein Chemie Rheinau GmbH | Feinle P.,Steinbeis Transferzentrum an der Hochschule Mannheim Kompetenzzentrum Tribologie | Rigo J.,Steinbeis Transferzentrum an der Hochschule Mannheim Kompetenzzentrum Tribologie
Tribologie und Schmierungstechnik | Year: 2013

In 2009 Schulz and Holweger have introduced a new model regarding interaction of additives on metal surfaces [Schu 10]. 2011 some special additives were investigated regarding their interactions with metal surfaces. Main point of these investigations was the relevance of the old or the new model for these interactions [Schu 11]. In practice lubricants work well only by reason of a well adjusted combination of additives. Test results should (from this point of view) be discussed only in this context. In the present paper additives and their interactions will be investigated and discussed only in this sense.


Schulz J.,WISURA GmbH | Feinle P.,Kompetenzzentrum Tribologie an der Hochschule Mannheim | Hirdt A.,Kompetenzzentrum Tribologie an der Hochschule Mannheim | Rigo J.,Kompetenzzentrum Tribologie an der Hochschule Mannheim | And 2 more authors.
Tribologie und Schmierungstechnik | Year: 2012

An important aspect of tribology and lubrication in metalworliing are the questions regarding phenomena's and their predictability. Using well known paradigm of interactions - additives with metal surface-it's nearly impossible or at least difficult to get real answers. One reason is the low knowledge of metal surfaces. Test results of tri-bo-machines or of the field should be treated careful and only connected with the whole tribo-system. In the present work should be introduced the results which were won in the Brugger machine with test bodies w ith different surfaces. On the basis of preparations with model character and products which are used in practice successfully in the metal working the results should be discussed.


Schulz J.,WISURA GmbH | Huesmann-Cordes A.G.,IWT - Foundation Institute of Materials Engineering | Gebert K.,IWT - Foundation Institute of Materials Engineering | Meyer D.,IWT - Foundation Institute of Materials Engineering | Brinksmeier E.,IWT - Foundation Institute of Materials Engineering
Tribologie und Schmierungstechnik | Year: 2014

In 2009 Schulz and Holweger have introduced a new model which describes the interactions of additives with metal surfaces [[]Schu 10]. In 2011 a range of additives was investigated and the results enabled the discussion of the additive interactions with metal surfaces with regard to the common and new model [[]Schu 12]. This contribution focuses on anti wear additives, which have not yet been examined in this context. First of all, it has to be clarified whether all anti wear additives follow the same (re)action principle. Another possibility is that there are obvious differences in the (re)action of anti wear additives with the metal surfaces depending on the nature of the metal surface.


Huesmann-Cordes A.G.,IWT - Foundation Institute of Materials Engineering | Meyer D.,IWT - Foundation Institute of Materials Engineering | Brinksmeier E.,IWT - Foundation Institute of Materials Engineering | Schulz J.,Wisura GmbH
Procedia CIRP | Year: 2014

The ability of metalworking fluids (MWF) to cool and lubricate the contact zone between tool and workpiece is strongly dependent on the surface-active substances such as extreme pressure additives (EP) and passive extreme pressure additive (PEP) as well as the chemical surface properties of steel. Low alloyed steels and stainless steels were examined with a wear resistance test by applying MWF with defined varied concentrations of additives featuring different properties e.g. regarding activity and molecular structure. The wear resistance was assessed and correlated with the chemical properties of the metals. Synergistic and antagonistic effects were obtained and will be discussed. The results gained from the experiments, clearly indicate, why the amount of the additives is less decisive for wear resistance than the relative ratio of polar and unpolar EP/PEP-additives. The optimal result furthermore depends on the chemical properties of the considered surfaces. © 2014 The Authors. Published by Elsevier B.V.


Since decades in the lubricant industry a figure exists which explains the temperature areas in which lubricant additives are effective. This figure is not very helpful in the development of lubricants. Also the source is not to be find out any more. The following originated. It will be checked whether the values in the picture correspond with the reality. There will be given an explanation to the interaction of additives with metal surfaces.


Koch T.,WISURA GmbH | Brinksmeier E.,IWT - Foundation Institute of Materials Engineering | Meyer D.,IWT - Foundation Institute of Materials Engineering
Tribologie und Schmierungstechnik | Year: 2012

In the past decades the scientific understanding of MWF effectiveness could not keep up with the rapid developments in the industrial application of MWFs. As a consequence of this lack of knowledge, today's MWFs consist of several dozens of chemical components with partly harmful properties and thus hazardous potential for the operator and the environment. Since every year enormous quantities of MWFs are used and disposed (e.g., 640,000 tons/yr. in Germany), their role in European industries and their effects on the environment have to be rethought from a scientific point of view. Since May 2011 the ERC funded CoolArt project at Prof. Brinksmeier's working group at the Foundation Institute of Materials Science (IWT, Bremen) takes the challenge to identify further potential in MWF composition and application on a scientifically based way. The distinguishing feature of the CoolArt-approach will be its cross-disciplinary and comprehensive nature, which strongly requires a multi-disciplinary research team from chemistry, physics, microbiology, mechanical engineering, and materials science. The visions and the innovative approaches of the project are pres-ented in this paper.

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