Study of the wear behaviour of diamond-like coatings at elevated temperatures

The wear behaviour of a-C:H coatings in ambient air up to maximum temperatures of 300 degrees C is reported. A simultaneous tribological and thermal load was imposed using a low-amplitude oscillatory sliding test in combination with a heatable specimen holder. The investigation showed that the tribological behaviour of the a-C:H coatings changed considerably at elevated temperatures: the coefficient of friction decreased and the wear scars became larger and deeper, indicating a more severe wear process at elevated temperatures. Under the present test conditions tribological behaviour started to change around 100 degrees C. On previously annealed samples, however, the wear properties at room temperature remained stable up to annealing temperatures of 300 degrees C. The temperature dependent wear behaviour of diamond-like carbon has been linked to the surface properties of these materials which become modified at relatively low temperatures where bulk properties are known to remain unchanged. (C) 1998 Elsevier Science S.A.status: publishe

Study of the wear behaviour of diamond-like coatings at elevated temperatures

The wear behaviour of a-C:H coatings in ambient air up to maximum temperatures of 300 degrees C is reported. A simultaneous tribological and thermal load was imposed using a low-amplitude oscillatory sliding test in combination with a heatable specimen holder. The investigation showed that the tribological behaviour of the a-C:H coatings changed considerably at elevated temperatures: the coefficient of friction decreased and the wear scars became larger and deeper, indicating a more severe wear process at elevated temperatures. Under the present test conditions tribological behaviour started to change around 100 degrees C. On previously annealed samples, however, the wear properties at room temperature remained stable up to annealing temperatures of 300 degrees C. The temperature dependent wear behaviour of diamond-like carbon has been linked to the surface properties of these materials which become modified at relatively low temperatures where bulk properties are known to remain unchanged. (C) 1998 Elsevier Science S.A.status: publishe

Catalysis of Thiol–Thioester Exchange by Water-Soluble Alkyldiselenols Applied to the Synthesis of Peptide Thioesters and SEA-Mediated Ligation

International audienc

Anchorage of Synthetic Peptides onto Liposomes via Hydrazone and α-Oxo Hydrazone Bonds. Preliminary Functional Investigations

International audienc

L’expérimentation animale reste indispensable (OPINION)

Trop fréquemment, l’expérimentation animale est présentée comme une pratique archaïque. Elle a bien changé. Et 100 % des patients traités le sont grâce aux concepts et techniques développés grâce à elle