High temperature tribology of ceramics

Woydt, Mathias; Habig, Karl‐Heinz

doi:10.1016/0301-679x(89)90168-0

Cited by 127 publications

(32 citation statements)

References 5 publications

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“…For the unlubricated sliding wear tests performed according to former DIN 50324 (ASTM G-99), a BAM-designed high-temperature tribometer, described in detail elsewhere 22) , was used. Sintered alumina (99.7%, FhG-IKTS) bodies were used as stationary spherical (R 1 = 15 mm and R 2 = 21 mm) specimens with polished surfaces (R a = 0.033 µm, R pk = 0.019 µm), which were pressed during the test against the coated planar surfaces of the rotating specimens.…”

Section: Unlubricated Sliding Wearmentioning

confidence: 99%

Oil Free Machinery and “Zero Wear”- Dream or Reality?

Woydt

2011

Tribology Online

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Original equipment manufacturers (OEMs) and end-users perceive "Zero Wear" differently. The "Zero Wear" approach will be put into a general relation for different applications and illuminated by individual paths, either based on monolithic materials, thin film coatings or alternative base oils, featuring triboactive materials and lubricious oxides for tribological engine components and dry running foil bearings or specific DLC, ta-C and novel Zirconium-based thin film coatings for concentrated contacts above FZG 14 and alternative engine oils (NoSAP & bio-no-tox). The associated tribometric test equipments for these examples will also be detailed.

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Section: Unlubricated Sliding Wearmentioning

confidence: 99%

Oil Free Machinery and “Zero Wear”- Dream or Reality?

Woydt

2011

Tribology Online

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“…Ohne die verschiedenen Ursachen für die an unterschiedlichen Gleitgeschwindigkeiten einsetzenden Anstiege (s. Bild 1) im Verschleißkoeffizienten hier diskutieren zu wollen (siehe [22,23] …”

Section: Verschleißbeträgeunclassified

Ti‐O – Ein Stoffsystem mit erscheinungsreichen tribologischen Eigenschaften

Woydt

2004

Materialwissenschaft Werkst

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Das ungeschmierte tribologische Verhalten von verschiedenen Stoichiometrien und mit unterschiedlichen Verfahren hergestellten Schichten und Werkstoffen im System Ti-O wird vorgestellt. Der Phasenreichtum geht einher mit dem gleichen Erscheinungsreichtum im tribologischen Verhalten. Obwohl aus den Stoffeigenschaften kaum erkennbar, offenbart das System Ti-O eine phasenweise herausragende Verschleißbeständigkeit, allerdings wurden Reibungszahlen von 0,2 kaum unterschritten.Schlü sselworte: Magnéli-Phasen, Gleitverschleiß, Titandioxid, Trockenlauf, TiO 2The unlubricated tribological behavior of several stoichiometries and different coating techniques and materials in the system Ti-O is presented. The appearance in tribological behavior is as much rich as the magnitude of existing phases. Even the materials properties dońt reveal lubricious properties, the system Ti-O disclosed in some cases an outstanding wear resistance, even coefficients of friction below 0,2 were not observed.

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“…Previous studies have shown that the tribological performance depends on the experimental conditions (normal load, sliding velocity, temperature, humidity, sliding distance, etc.) [4,5], on the method of surface finishing [6], and the microstructure (grain size, porosity, second phases, properties of grain boundaries, etc.) [2,7].…”

Section: Introductionmentioning

confidence: 99%

Microtribological Properties of Two-Phase Al2O3 Ceramic Studied by AFM and FFM in Air of Different Relative Humidity

Ziebert¹,

Gahr²

2004

Tribology Letters

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Commercially available, monolithic alumina ceramic was modified using CO 2 -laser irradiation by surface remelting and adding HfO 2 powder. Scanning electron microscopy revealed that the microstructure of the modified ceramic consisted of a fine lamellar eutectic Al 2 O 3 -HfO 2 phase embedded in the Al 2 O 3 matrix. Differences in the microtribological properties of the matrix and the eutectic phase could be measured by friction force microscopy (FFM) during unlubricated sliding contact with a silicon tip at room temperature as a function of relative humidity of the surrounding air and normal load. The dependence of the friction coefficient and the pull-off force on humidity was explained by the formation of lubricating tribochemical surface layers and described by theoretical models.

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High temperature tribology of ceramics

Cited by 127 publications

References 5 publications

Oil Free Machinery and “Zero Wear”- Dream or Reality?

Oil Free Machinery and “Zero Wear”- Dream or Reality?

Ti‐O – Ein Stoffsystem mit erscheinungsreichen tribologischen Eigenschaften

Microtribological Properties of Two-Phase Al2O3 Ceramic Studied by AFM and FFM in Air of Different Relative Humidity

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