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Influences of TiC Impurities on Dry-sliding Wear of Polycrystalline Ceramic

Journal of Wuhan University of Technology(Materials Science) 2022年第4期37卷 570-575页

作者： BENDAOUDI Seif Eddine BOUNAZEF Mokhtar djeffal ali Laboratory of Industrial Engineering and Sustainable Development Department of Mechanical EngineeringUniversity of RelizaneAlgeria Department of Mechanical Engineering University Djillali LIABES of Sidi Bel AbbesAlgeria

The wear behavior of titanium silicon carbide MAX phase was *** of highly pure TiSiCand containing 8% of TiC,sliding dryly against Corundum counterpart,were tested at various speeds increasing from 5 to 60 m/s and under applied pressure of 0.1-0.8 *** sliding-wear tests were performed on Tribometer,at room temperature of 15℃ with a relative humidity of 10%.The expermental results show that the presence of TiC particles can be beneficial to reducing the wear rate for certain ranges of sliding speed and applied *** sliding-wear performances were expressed as a mathematical model,obtained through a modelling by the method of design of *** influence of TiC impurities on the wear behaviors was also *** is concluded that the wear mechanisms of samples are more affected by the presence of TiC under the effect of applied pressure compared with that of the sliding speed.

关键词： sliding-wear pin-on-disc design of experiments mathematical model polycrystalline ceramic

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Behavioural Modelling of Lips Seal Made with Polytetrafluoroethylene Enriched by Glass Fibers

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Modeling and Numerical Simulation of Material Science 2013年第4期3卷 170-174页

作者： ali djeffal Seif Eddine Bendaoudi Mokhtar Bounazef El Abbas Adda Bedia Materials and Hydrology Laboratory Department of Civil Engineering Djillali Liabes University Sidi Bel Abbes Algeria Materials and Hydrology Laboratory Department of Mechanical Engineering Djillali Liabes University Sidi Bel Abbes Algeria

Polytetrafluoroethylene reinforced with glass fibers is a composite material widely used in industry mainly for the manufacture of seals at the level of the rotary shafts of vehicles and stationary floor machines such as turbines and compressors. However, due to elastic and viscous-plastic properties of this material, it wears quickly under the influence of some external parameters during operation. There are therefore material loss, increased clearance and loss of sealing. This work summarises a series of tests carried out with this material in order to analyse the variation of the friction coefficient due to the roughness of the work piece brought into contact with the PTFE, the linear velocity of contact between them and material yield strength. To do this analysis, we used the method of unconventional design of experiments to model the behaviour of material and consequently make decisions to reduce this wear. The results are shown and deeply analysed in the following text as a polynomial mathematical model, graphs, contours and response surfaces illustrating the holding of this material under the effect of the three parameters mentioned above. The previous PTFE samples enriched with chopped glass fibers are not subjected to axially force this time, contrary to the force applied radially. The advantage of this method is the relative linear velocity at the contact sample-disc and the applied pressure remains constant. Under the action of the weight “P” applied on the sample, it comes into friction with the rotating disc whose roughness changes from experience to another;it is expressed by the values of Ra. Tangential friction force appears at the point of contact and is equilibrated by measured force Fm on the lever. The calculation of the moment relative bench axis caused by 2 forces gives the coefficient of friction. Knowing the values of frictional force Ft by calculation and the weight P, we determine then the friction coefficient.

关键词： Composite Material Friction Wear Glass Fibers Design of Experiments Modelling

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