6 results on '"Peter A. Gold"'
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2. Effects of PVD‐coatings on Fatigue of Roller Bearings
- Author
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Thomas Wolf, Michael Plogmann, and Peter Werner Gold
- Subjects
Materials science ,Composite material - Published
- 2009
3. PVD-Beschichtungen für trockenlaufende Hybridwälzlager
- Author
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Kirsten Bobzin, R. Nickel, Nazlim Bagcivan, Michael Plogmann, A. Krämer, Jörg Loos, and Peter W. Gold
- Subjects
business.product_category ,Coating ,business.industry ,Metallurgy ,engineering ,Die (manufacturing) ,engineering.material ,Condensed Matter Physics ,business ,Surfaces, Coatings and Films - Abstract
PVD-Beschichtungen konnen die Eigenschaften trockenlaufender Hybridwalzlager verbessern. So kann der Verschleis, aber auch das Reibmoment mit ihrer Hilfe herabgesetzt werden. Um dies zu erreichen, wurden PVD-Schichten im Hinblick auf die auftretenden Belastungen weiterentwickelt. Untersuchungen mit Hilfe des standardisierten FE8-Walzlagerprufstands dienten zum Nachweis des Potentials der PVD-Beschichtungen fur den Trockenlauf. Die Ergebnisse dieser Untersuchung wiederum flossen in die Schichtentwicklung ein. PVD coatings for dry running hybrid roller bearings PVD coatings are able to improve the characteristics of dry running hybrid roller bearings. Wear and friction moment can be reduced by coatings. Therefore PVD coatings were adjusted for the appearing loads. Examinations with the help of the standardised FE8 test-rig were used to verify the potential of PVD coatings in dry running applications. The results of the tests were taken into account for further coating development.
- Published
- 2007
4. Bewertung von Schicht-Substrat-Systembelastungen mit Hilfe von Kontaktspannungssimulation
- Author
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Peter Werner Gold, Jörg Loos, and Helge Klaas
- Subjects
Materials science ,Mechanics of Materials ,Research centre ,Mechanical Engineering ,Mechanical engineering ,Inhomogeneous material ,General Materials Science ,Surface loading ,Vapour deposition ,Composite material ,Condensed Matter Physics ,Roller bearing - Abstract
Zur Realisierung von umweltvertraglichen Tribosystemen werden im Sonderforschungsbereich SFB 442 PVD (Physical Vapour Deposition) -Schichtsysteme entwickelt, welche zusammen mit entfeinerten Schmierstoffen deren tribologische Eigenschaften verbessern. Bei Bewertung von Schicht-Substrat-Systemen fur den Einsatz in tribologischen System ist es von besonderer Bedeutung zu erfassen, welchen Beanspruchungen diese Systeme ausgesetzt sind und wie ihre Eigenschaften das Beanspruchungs-Kollektiv beeinflussen. Gegenstand der vorgestellten Untersuchungen ist eine Analyse der Parameter des Schicht-Substrat-Systems mit signifikanten Effekten der Oberflachenbeanspruchung. Dabei werden Unterschiede zu den bekannten Oberflachenbeanspruchungen der Massivwerkstoffe aufgezeigt und mathematische Modelle zur Beschreibung des Schicht-Substrat-Einflusses entwickelt. Ziel dieser Untersuchungen ist es, die im Tribosystem (z. B. Walzlager) auftretenden Belastungen mit denen in den Schicht-Prufverfahren (z. B. Rockwell-Haftklassenuntersuchung, Nanoindentermessung) aufgebrachten Belastungen in einen Zusammenhang zu stellen. Denn nur so ist es moglich, die in den Schicht-Prufverfahren gewonnenen Ergebnisse zur Bewertung eines Schicht-Substrat-Systems heranzuziehen. Entscheidendes Hilfsmittel ist hier die Simulation der mechanischen Oberflachenbeanspruchung mittels FEM (Finite Element Methode). Hiermit ist es moglich, den anisotropen und inhomogenen Werkstoffeigenschaften des Schicht-Substrat-Systems Rechnung zu tragen. Evaluation of Coating Substrate Compounds Strain Using Contact Stress Simulation For the realisation of environmental compatible tribosystem in collaborative research centre SFB 442 new PVD-coatings are developed. These improve combined with additive free lubricants the tribological characteristics of this tribosystem. To evaluate these coated compounds for the application in tribosystems, it is important to understand to which loading these systems are exposed to and how their properties affect their mechanical stress. The subject of the presented investigation is an analysis of which coated substrate systems parameter have significant effect on the system strains. The differences between known mechanical stress theories of bulk materials are pointed out and a mathematical model for the description of stresses are developed. The goal of this investigation is to find correlations between tribological loads (for example roller bearing) and coated substrate testing stresses (for example Rockwell test, Nanoindenter measurement). With these, it is possible to use the results of coated substrate tests to evaluate the coated substrate system. A crucial aid herein is the simulation of surface loading using FEM (Finite Element Method). With this method, it is possible to regard the anisotropic and inhomogeneous material characteristics of a coated substrate system.
- Published
- 2004
5. Leistungsfähige PVD-Wälzlagerbeschichtungen
- Author
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Jörg Loos, Peter Werner Gold, and Marius Kuhn
- Subjects
Reaction layer ,Materials science ,Mechanics of Materials ,Mechanical Engineering ,Mechanical engineering ,General Materials Science ,Take over ,Composite material ,Condensed Matter Physics ,Deposition process ,Range analysis ,Roller bearing - Abstract
Anhand von Axial-Zylinderrollenlagern wurde systematisch untersucht, inwieweit PVD-Schichten in der Lage sind, die Funktionen von EP/AW-Schmierstoffadditiven zu ubernehmen. Die Walzlager wurden im starken Mischreibungsgebiet gepruft, um die Leistungsfahigkeit der Schichten moglichst schnell differenzieren zu konnen. Verschiedene Schichtsysteme wurden auf ihre Fahigkeit hin untersucht, einen unbeschichteten Gegenkorper zu schutzen. Dazu wurden bei Walzlagern lediglich die Lagerscheiben beschichtet, die Rollen blieben unbeschichtet. Dabei zeigten vier Me-C:H-Schichsysteme beste Verschleisschutzeigenschaften und kaum Oberflachenschadigungen. Der Ubertrag von Schichtmaterial auf die unbeschichtete 100Cr6 Walzkorperoberflache konnte fur den hervorragenden Verschleisschutz verantwortlich gemacht werden. Dazu wurden genauere Untersuchungen mit der ESMA Analyse (electron beam micro range analysis) bei ZrCg-Schichten durchgefuhrt. Es konnte eine Triboschicht mit hohen Zirkon- und Sauerstoffanteilen nachgewiesen werden. Efficient PVD-coatings for roller bearings On the basis of cylindrical roller thrust bearings it was systematically examined to what extent PVD-coatings are able to take over the function of EP/AW-additives. The bearings were tested under heavy-duty conditions in order to distinguish very fast the efficiency of different coating-substrate-systems. Several coatings were tested for their ability to protect an un-coated counterpart. So just the washers of the roller bearings were coated, the rollers stayed un-coated. Four Me-C:H-coatings showed the best performance and fulfilled the required criterion for roller bearings in the boundary friction: low loss of mass and hardly surface deviation. Material carryover from the carbonaceous coating to the 100Cr6 steel surface was developed by the Me-C:H-coatings during the tests. This mechanism was able to protect the un-coated rollers. Closer investigations were done with an ESMA analysis (electron beam micro range analysis) on ZrCg-coatings. It could be seen, that a reaction layer was formed on the rollers. This layer contained remarkable masses of zirconium and oxygen.
- Published
- 2003
6. Viscosity–pressure–temperature behaviour of mineral and synthetic oils
- Author
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H. Dicke, A. Schmidt, Jörg Loos, C. Assmann, and Peter Werner Gold
- Subjects
Viscosity ,Mineral ,Materials science ,Atmospheric pressure ,Mechanical Engineering ,General Chemical Engineering ,Relative viscosity ,Viscometer ,Modulus ,Viscosity index ,Lubricant ,Composite material ,Surfaces, Coatings and Films - Abstract
A new high-pressure viscometer that can measure viscosity at pressures up to 0.8 GPa has been developed in the authors' laboratory. The ‘modulus equation’ has been used to compare the behaviour of mineral and synthetic lubricants. Among the oils investigated there was one ester that biodegraded rapidly both before and after ageing in a long-term test-rig operation. To facilitate a comparison or application of the results to other oils, an analysis of the correlation between the viscosity—pressure coefficient and the kinematic viscosity measured at atmospheric pressure has been provided. A prediction of lubricant film thickness based on high-pressure viscosity data is compared with film thickness measurements in a roller bearing.
- Published
- 2001
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