http://dspace.univ-setif.dz:8888/jspui/handle/123456789/256 2026-05-25T17:10:08Z 2026-05-25T17:10:08Z Mouhoubi, S. Osmani, H. Bali, T. Abdeslam, S. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/324 2015-03-25T11:43:58Z 2012-01-01T00:00:00Z

Titre: Élaboration et étude des propriétés des composites Polyester- Alfa traitée et non traitée Auteur(s): Mouhoubi, S.; Osmani, H.; Bali, T.; Abdeslam, S. Résumé: In the present work we have study the chemical treatment effect on the composites proprieties. Our composites have prepared in the No metallic materials laboratory (LMNM- Sétif). Those are building with the contact molded method under a sandwich form. We have introduced untreated and treated Alfa fiber mat in the resin polyester matrix. The chemical treatment that we have used is alkali treatment with 5% of NaOH during 6 hours. This results show that the chemical treatment have an important effect on the composites mechanical and physical behavior and also on the interface between vegetable fiber and polymeric matrix.

2012-01-01T00:00:00Z Boudchicha, M.R. Achour, S. Bonnet, J.P. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/322 2015-03-25T11:43:41Z 2012-01-01T00:00:00Z

Titre: Comportement thermique des mélanges kaolin-dolomie Auteur(s): Boudchicha, M.R.; Achour, S.; Bonnet, J.P. Résumé: L’Algérie est un pays qui regorge de minéraux naturels à bon marché et qui ne sont pas utilisés jusqu'à maintenant à leur juste valeur, surtout dans le domaine de la céramique. Notre travail a pour objectif la préparation de céramiques à partir de mixtures de kaolin et de dolomie, deux matières premières d’origine locales très abondantes. La première se trouve à Guelma dans les montagnes de Djbel Dbagh et la deuxième dans la région de Batna. Cette étude s’intéresse aux comportements thermiques des mixtures kaolin-dolomie. L’analyse quantitative du processus de recristallisation du mélange kaolin-dolomie a été abordée et les énergies d’activations de la recristallisation des mixtures K10D, K14D et K18D ont été mesurées par analyse thermique différentielle et correspondent respectivement aux valeurs : 440, 503 et 521 KJ.mol -1 . Pour les trois compositions choisies (10, 14 et 18% en masse de dolomie calcinée), on obtient après traitement thermique des céramiques denses à base essentiellement de cordiérite et d’anorthite.

2012-01-01T00:00:00Z Chorfa, A. Belkhir, N. Hamidouche, M. Petit, F. http://dspace.univ-setif.dz:8888/jspui/handle/123456789/320 2015-03-25T11:44:47Z 2012-01-01T00:00:00Z

Titre: Study of the glass deformation regime transition using indentation and scratch test Auteur(s): Chorfa, A.; Belkhir, N.; Hamidouche, M.; Petit, F. Résumé: The scratch tests are often used to study the friction and the wear phenomena thus to identify locally the materials mechanical proprieties. In this context, our study aimsto contribute to the understanding of the glass deformation regime transition using the scratch and the indentation. The characterization of the scratching resistance and the comprehension of the scratching damage on the basic of structural considerations and mechanicalanalysis were done. Tests of progressive linear scratching and instrumented indentation, were performed on two glasses nuances using different indenters and environments. The obtained results show a similarity of the scratch behavior of the two glass types by comparison of their deformation. However, the obtained rupture critical load of the borosilicate and the soda lime glasses were about 4.16 N and 5.34 N respectively. In addition, the humid environment has a notable effect on the deformation regime in scratching.

2012-01-01T00:00:00Z Issaoui, Mansour Bouaziz, Jamel Fourati, Mohieddine http://dspace.univ-setif.dz:8888/jspui/handle/123456789/318 2015-03-25T11:44:15Z 2012-01-01T00:00:00Z

Titre: Grafting of kaolin with trifunctional silanes Auteur(s): Issaoui, Mansour; Bouaziz, Jamel; Fourati, Mohieddine Résumé: Silane-grafted-kaolin was synthesized by using octadecyltrichlorosilane, octyltrichlorosilane and phenyltrichlorosilane. These different silanes used have a prominent effect on the mechanism of the condensation reactions with the clay. The NMR spectroscopy indicated that there are various bonding possibilities of the trichlorosilanes molecules with the kaolin surface. The increase in the relative intensity of Q 3 and the appearance of Q 2 , T 3 , T 2 and T 1 signals clearly indicates the grafting of silane molecules to kaolin surface silanol groups. The samesuccessful graft of silanes was demonstrated by the appearance of characteristic absorption bands in the range of 2800-3000 cm -1 in the FTIR spectra, assigned to the C-H stretching and bending vibration.

2012-01-01T00:00:00Z