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Evolution microstructurale et propriétés mécanique d'un assemblage WC-Co/Ag-Cu-Zn/ WC-W-Ni (Fe) et WC-Co / Acier 20NC6 réalisé par Soudo-brasage.

Auteur : Bilal CHENITI
Année : (En cours)
Domaine : Métallurgie
Type : Thèse de doctorat
Etablissement : Université des sciences et de la technologie Houari Boumediène (USTHB)
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : multi-matériaux, interfaces, infiltration, rechargement dur, projection thermique., soudo-brasage, Carbure de tengstène

Résumé :

The non-conventional sintering loose powder process employed to realize the active part of the drilling tools in PDC (Polycrystalline Diamond Compact) is the suitable technique used due to the complex geometry of the tool. In this study, we are focusing on the welding of the PDC cutter with the infiltrated matrix and the steel part, which require optimization of the parameters related to the powder mixture, the shielding gas used and the current density imposed. The predominant mechanism of densification is the capillary attraction between loose powder and the binder metal employed. This present thesis outstandingly consists in both the microstructural evolution and mechanical behavior of two distinct types of a loose powder mixture of the Metallic Matrix Composites (MMC): the P1 (WC-W-3Fe) and the P2 (WC-Ni-2Fe) after a consolidation by the non-conventional process of infiltration via a metallic binder BN (Cu- 6Sn-9Ni). Nevertheless, the two types of consolidated already infiltrated have been assembled with a PDC substrate cutter (WC-Co cermet). Moreover, the assembly techniques used are brazing and welding in a controlled atmosphere by using the same filler alloy to compare the two processes in terms of formed phases, mechanical properties adhesion and porosity joints. On the other hand and in order to complete this study, we brazed and welded WC-Co to SEA 1020 steel used for some drilling operations