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  • Holzer, Achill  (5)
  • 1
    Online Resource
    Online Resource
    About the change of flow factors during the run-in process of lubricated contacts
    Emerald ; 2022
    In:  Industrial Lubrication and Tribology Vol. 74, No. 3 ( 2022-03-29), p. 316-323
    Details
    In: Industrial Lubrication and Tribology, Emerald, Vol. 74, No. 3 ( 2022-03-29), p. 316-323
    Abstract: This paper aims to increase the knowledge of the run-in process of lubricated contacts in hydraulical pumps. When performing EHL simulations of tribological contacts, the surface influence needs to be taken into account. This experimental measurement wants to investigate the amount of change of the flow factors in the first hour of run of tribological contacts. Design/methodology/approach An experimental test bench is used to run-in several samples. After several minutes of running, samples are removed and the surface structure is captured using a digital microscope. With the measured data, flow factors are calculated. Findings The findings were clear that flow factors are highly direction-dependent, especially shear flow factors in radial directions experience almost no change. Overall, influence of the surface structure of up to 30% compared to a flat surface can be registered. Originality/value This paper helps to choose application-oriented values for the simulation of tribological contacts.
    Type of Medium: Online Resource
    ISSN: 0036-8792 , 0036-8792
    URL: Article
    DOI: 10.1108/ILT-06-2021-0216
    Language: English
    Publisher: Emerald
    Publication Date: 2022
    detail.hit.zdb_id: 2025330-8
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Experimentelle Untersuchungen zum Einlaufverhalten bleifreier Sondermessinglegierungen
    Narr Francke Attempto Verlag GmbH + Co. KG ; 2022
    In:  Tribologie und Schmierungstechnik Vol. 69, No. 1 ( 2022-03-08), p. 16-32
    Details
    In: Tribologie und Schmierungstechnik, Narr Francke Attempto Verlag GmbH + Co. KG, Vol. 69, No. 1 ( 2022-03-08), p. 16-32
    Abstract: n tribological systems with high loads, leaded special brasses are preferably used because of their excellent wear properties. Axial piston pumps and motors are a good example of such systems. In order to be able to dispense with lead-containing materials in the future, alternative materials are being tested. The result of this development are three new lead-free special brass materials presented in this article. For these, the effect Abstract of surface roughness (fine/coarse) and the manufacturing process (fine grinding + vibratory grinding/ lapping + vibratory grinding) on the running-in behavior was investigated. The specifications for this are based on experience with the lead-containing reference material CuZn40Al2Mn2Si.
    Type of Medium: Online Resource
    ISSN: 0724-3472
    URL: Article
    DOI: 10.24053/TuS-2022-0003
    RVK:
    ZG 1100
    Language: Unknown
    Publisher: Narr Francke Attempto Verlag GmbH + Co. KG
    Publication Date: 2022
    detail.hit.zdb_id: 246052-X
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  • 3
    Online Resource
    Online Resource
    Tribological Performances of Diamond‐Like Carbon Coatings for Hydraulic Applications
    Wiley ; 2023
    In:  Chemical Engineering & Technology Vol. 46, No. 1 ( 2023-01), p. 118-127
    Details
    In: Chemical Engineering & Technology, Wiley, Vol. 46, No. 1 ( 2023-01), p. 118-127
    Abstract: The tribological performance of contacts within hydraulic pumps over a wide range of conditions is essential for the sustainability of mobile hydraulic systems. To reduce the energy consumption of hydraulic systems, mechanical losses and wear rates need to be reduced. Additionally, materials containing lead must also be replaced due to their environmental impact. In this study, the performance of different lead‐free combinations of hydrogenated diamond‐like carbon (hydr. DLC) coatings were investigated. For this purpose, the tribological behavior of hydr. DLC (Balinit DLC), ceramic‐doped hydr. DLC (Balinit C), and ceramic bond‐coated hydr. DLC (Balinit DLC Star) coatings on a nitride steel substrate were compared in tribometer tests.
    Type of Medium: Online Resource
    ISSN: 0930-7516 , 1521-4125
    URL: Issue
    URL: Article
    DOI: 10.1002/ceat.v46.1
    DOI: 10.1002/ceat.202200459
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1477681-9
    detail.hit.zdb_id: 56471-0
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  • 4
    Online Resource
    Online Resource
    Extreme High‐Speed Laser Material Application‐Coated Carbide‐Reinforced Control Plates and Conventional Lead‐Based Plates in Axial Piston Machines
    Wiley ; 2023
    In:  Chemical Engineering & Technology Vol. 46, No. 1 ( 2023-01), p. 110-117
    Details
    In: Chemical Engineering & Technology, Wiley, Vol. 46, No. 1 ( 2023-01), p. 110-117
    Abstract: Hydraulic drive train technology is widely used in both mobile and stationary systems, when high forces or torques are applied. In hydraulic components, high load levels must be supported due to increasing pressure levels of the fluid. Conventionally, leaded brass is used right against steel, where the lead not only aids the manufacturing process but also provides good tribological properties, such as low friction over a wide range of speeds and pressures. Currently promising lead‐free coatings using high‐speed laser material deposition (EHLA) will be implemented in a state‐of‐the‐art axial piston pump.
    Type of Medium: Online Resource
    ISSN: 0930-7516 , 1521-4125
    URL: Issue
    URL: Article
    DOI: 10.1002/ceat.v46.1
    DOI: 10.1002/ceat.202200402
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1477681-9
    detail.hit.zdb_id: 56471-0
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  • 5
    Online Resource
    Online Resource
    Investigation of the coating of hydrodynamic plain bearing contact surfaces by means of Extreme High-Speed Laser Material Deposition (EHLA)
    IOP Publishing ; 2021
    In:  IOP Conference Series: Materials Science and Engineering Vol. 1097, No. 1 ( 2021-02-01), p. 012016-
    Details
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 1097, No. 1 ( 2021-02-01), p. 012016-
    Abstract: In the field of drive technology, plain bearings are used in almost all drives. During operation these bearings have a very low load resistance and almost no wear. However, increased mixed friction can occur during starts, stops, low speeds and/or high loads. As a result of the increasing demands on the drive systems, such as in the automotive sector with the automatic start-stop system to reduce exhaust gases or in the area of the angular force, a greater mixed friction occurs, which increases wear. Extreme High-Speed Laser Material Deposition (EHLA) is a coating process that allows the application of cor-rosion and wear protection coatings in a resource-saving and productive manner. Furthermore, alterna-tive materials and material combinations can be created. In the framework of this study two different Metal Matrix Composites (MMC) are tribologically investigated and characterized in the area of mixed friction against three friction contacts each.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    URL: Article
    DOI: 10.1088/1757-899X/1097/1/012016
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2506501-4
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