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Articles by M. Tata
Total Records ( 3 ) for M. Tata
  D. Miroud , M. Tata and S. Lebaili
  In this study, two layers of loose powders’ mixtures (WC-15% Ni and W-14% Ni) are consolidated by the infiltration of a nickel bronze alloy (Cu-6% Sn-9% Ni-5% Mn) to form a double-layer composite. We varied the granulometry of the powders in four classes. We are particularly interested in the densification at the level of the formed interfaces in situ on the basis of interactions between the binder and the mixtures of powders as well as in the effect of certain elements on the formed composite cohesion. Hardness profiles are established in the direction of the infiltration and microhardness tests on the phases resulting from solidification will consolidate the various microstructural observations.
  M. Tata , D. Miroud , S. Lebaili and T. Cutard
  This study refers to the characterization of alloys WC-W-Ni, obtained from a process of sintering, by using fine powders infiltrated by an alloy Cu-Mn binder. This process is used to produce a carbide cemented high-speed cutting tools and drilling tools because of their high hardness, refractoriness and wear resistance. The study required, the determination of the sintering conditions of the infiltration. The operation of infiltration consists of heating the binder until the melting point 950°C to let it infiltrate by gravity, the mixture of metal powders respectively, W, WC, W+Ni, WC+Ni and WC+W, thus allowing the powder grains to drown in the binder while being densified during cooling. The characterization of powders is used to determine theirs physical properties, chemical composition, powder classes and specific surface. The present study investigates the possibilities of Cu-Mn alloys used as binder alloys in infiltration of WC-based and W-based powders. After infiltration, a microstructural and mechanical characterization of the sintered samples and infiltrant were conducted in order to include/understand the phenomena implied during the densification and infiltration.
  D. Miroud , M. Tata and S. Lebaili
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