The use of sintered metal bearings for high sliding velocities

Junghans, R.; Neukirchner, J.; Schumann, Dirk; Lippman, K.-H.

doi:10.1016/0301-679x(95)00087-k

Cited by 7 publications

(3 citation statements)

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“…Oscillating sliding wear is connected with tribo-chemical reactions like fretting corrosion and crack growth due to fatigue caused by cyclical tribological stress. These failures are relevant in many industrial applications from bearings to turbine blades or heat exchangers for power generation [36] and in the same way in miniaturized mechanical, optical and electronic devices. Studies on nickel dispersion coatings give evidence that strengthening by micron-und submicronscaled particles of Al 2 O 3 , SiC or diamond is more effective than strengthening by Si 3 N 4 or TiO 2 [27,37,38].…”

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Electroplated Nickel Composites with Micron- to Nano-Sized Particles

Wielage

Lampke

Zacher

et al. 2008

KEM

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Abstract. Electroplated nickel coatings provide ductility, excellent corrosion resistance and good wear resistance, which qualifies them to meet complex demands of engineering, microtechnology and microelectronics. The co-deposition of particles is a promising alternative to deposit layers with adequate microstructure and properties avoiding the rise of residual stress. The incorporation of the sufficient quantity of particles, monodisperse distribution and downsizing to nanometre scale affect the amount of strengthening by dispersion hardening. To avoid agglomeration in the electroplating bath as well as in the layer is a challenge which has been met by simple Watts nickel electrolyte with a minimum of organic additives and adequate bath agitation comprising sonication, i.e. the exposure of the bath to high-frequency sound waves.Well-dispersed hard particles (titanium oxide and silicon carbide) were incorporated in nickel films. The focus was set on the correlation between the gained microstructure of the composites with particles from micron to nanometre scale and the electrochemical and mechanical properties. Corrosion was quantified from polarisation curves and volumetric erosion measurements. Wear resistance was evaluated by scratch energy density studies, oscillating sliding wear testing and cavitation wear testing and compared to indentation hardness results.Sonication and particle downsizing result in matrix grain refinement and dispersion hardening. Incorporation of different particles with respect to different material and size proved to meet different demands. Submicron TiO 2 is best for high corrosion resistance, sonicated nickel without particle incorporation is best for high abrasion resistance, nano TiO 2 is best for oscillating sliding wear resistance and submicron SiC is best for cavitation wear resistance.

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Electroplated Nickel Composites with Micron- to Nano-Sized Particles

Wielage

Lampke

Zacher

et al. 2008

KEM

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“…The leaded-bronzes have been extensively used as bearings in industry because of their excellent tribological properties. However, they also show some distinct shortcomings, such as low tensile and creep strength as well as low hardness, resulting in the failure of mechanical parts [2].…”

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Fabrication and Characterisation of Bronze Pads and Comparison with Commercial Bronze Pads

Demir

2016

Acta Phys. Pol. A

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CuSn10 pre-alloyed bronze with iron and graphite powders were mixed, pressed and sintered for the bronze pad fabrication. The powder mix was pressed under pressure in the range of 100-600 MPa and sintered at temperatures between 780-850• C. The optimum compression was at 500 MPa and the optimal sintering temperatures was 730• C. 2 wt.% of graphite addition was sufficient to adjust the friction and wear properties of produced bronze pad samples. Optical microscope and SEM images showed that a homogenous powder mix was achieved. The produced bronze samples and the commercial ones were compared and beneficial properties of them were determined. The wear behaviours of both the produced friction materials and the commercial pads were examined. The coefficient of friction and wear rates were determined. The sintered bronze samples and the commercial bronze pads have exhibited similar wear behaviour, although the commercial one have contained ceramic particles.

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“…vier Milliarden gefertigten Wälz-lagern 0,335 % beträgt. Davon aber entstehen nahezu die Hälfte der Schäden durch tribologische Ursachen wie Passungsrost an Wälzlagersitzen oder Stillstandsmarkierungen auf den Laufflächen [1]. Bei Wärmetauschern kann Schwingungsverschleiß zu erheblichen Schäden führen, besonders bei Einsatz in Kraftwerken.…”

Section: Introductionunclassified

Mikrostruktur‐Untersuchungen zum Schwingungsverschleißverhalten von Nickelkomposit‐ und Ni‐P‐Schichten

Lampke

Leopold

Dietrich

et al. 2006

Materialwissenschaft Werkst

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Schlüsselworte: Gefügecharakterisierung, Schwingungsverschleiß, Martenshärte, Galvanische Nickelnanokomposite, Chemisch Ni-P-Schichten In many industrial applications, oscillating sliding wear leads to serious damage of construction components. To avoid this, different layers of electroplated nickel and nickel composites as well as chemically deposited nickel phosphorus layers are used and/or tested. The performance of these layers under oscillating sliding wear was characterized. Additionally microstructure characterisations took place regarding grain size, particle content and distribution as well as concerning crystallization and development of tetragonal phase nickel phosphide. These results correlate well with the Martens hardness of the layers and contribute to understand the oscillating sliding wear characteristics of the examined layers. Heat treated Ni-P layers achieve twice the hardness of nickel dispersion layers; however, fail under oscillating sliding stress by embrittlement, cracking and debonding. On the other hand dispersion-hardening nano composites with TiO 2 clearly exhibit a more favourable tribological behaviour. A solid content of approx. 3 vol-% leads to dispersion and fine grain hardening effects, which cause good protection against oscillating sliding wear; thereby the Ni-matrix remains ductile. The incorporation of very hard particles (SiC) intensifies the oscillating sliding wear process due to the abrasive effect of the particles.

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The use of sintered metal bearings for high sliding velocities

Cited by 7 publications

References 1 publication

Electroplated Nickel Composites with Micron- to Nano-Sized Particles

Electroplated Nickel Composites with Micron- to Nano-Sized Particles

Fabrication and Characterisation of Bronze Pads and Comparison with Commercial Bronze Pads

Mikrostruktur‐Untersuchungen zum Schwingungsverschleißverhalten von Nickelkomposit‐ und Ni‐P‐Schichten

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