Search results for "métal"

Cavaillon (84), Ancienne cathédrale Notre-Dame-et-Saint-Véran. Suivi archéologique de sondages géotechniques

2023

Pour les besoins de l’étude géotechnique, six sondages ont été creusés dans et autour de l’ancienne cathédrale de Cavaillon en février 2020. Ils avaient pour objectif de comprendre les désordres structurels observés sur l’édifice en mettant à jour les fondations des différentes constructions (chapelles, chevet, nef et annexe). Compte-tenu du contexte archéologique, le Service Régional de l’Archéologie de PACA a prescrit leur suivi archéologique. L’objectif était de documenter les niveaux d’occupation mis au jour sans détruire les vestiges remarquables, en particulier les maçonneries et les sépultures. Parmi les sondages, les trois situés au nord de l’ancienne cathédrale, le long de la rue D…

Clermont-Ferrand (63), Place des Carmes Déchaux: Rapport Final d’Opération d’Archéologie Préventive

2022

Development of high entropy tungsten-based alloys by powder metallurgy processes

2022

Although metallurgy is a very old research domain, many innovations are still being considered, such as the emergence of high-entropy alloys. These alloys, composed of at least three elements, are characterized by a chemical composition without a majority element and most of the time equimolar. Research in this field is very recent since the first studies concerning these alloys are from the early 2000s. The original chemical compositions of these alloys open the way to many possibilities to obtain unusual properties.In conjunction with these developments, powder metallurgy processes are expanding quickly because of the advantages they offer over more traditional techniques (foundry and for…

Consolidation and densification mechanisms of copper powder during Spark plasma sintering (SPS)

2015

Spark plasma sintering is a manufacturing process that leads to dense materials with fine microstructures. SPS combines heating and uniaxial load as well as the Hot Pressing (HP) process but the material is heated using a pulsed current. The phenomena occurring during SPS are not fully understood and are still an open point: -Which densification and consolidation mechanisms are involved during SPS? -Why is sintering by SPS more efficient than sintering by traditional ways such as HP? –Does electrical current modify the sintering mechanisms? The aim of this work is to answer these questions in the case of spherical copper powder (from 10 to 50 µm). Comparisons between SPS and HP were perform…

Une production locale d’épées à poignée métallique dans l’est de la France à la fin de l’âge du Bronze ?

2018

International audience; Une première étude croisée des formes et des techniques de fabrication des épées à poignée métallique de la fin du Bronze final au niveau européen a permis de dégager l’hypothèse d’une possible fabrication indépendante de ce type d’arme dans l’est de la France. Cette proposition repose tout particulièrement sur l’étude de deux groupes typologiques contemporains : le type Mörigen et la variante Hostomice du type Tachlovice. Ce travail vise à illustrer le potentiel des études technologiques sur ces épées qui, en complément de la typologie, permettront d’obtenir de précieux renseignement sur les artisans métallurgistes ou encore sur les centres de production et les rése…

Noise identification and sampling frequency determination for precise Pb isotopic measurements by quadrupole-based Inductively Coupled Plasma Mass Sp…

2000

Analytical precision of the isotope ratios measured by quadrupole-based ICP-MS is drastically controlled by the low- frequency noises which originate from nebulisation and vaporisation processes, and from sample introduction systems. The unde- sirable influence of these latter can be however reduced by choosing efficiently the operating parameters. In the present study , the choice of the stabilisation time necessary in peak jump mode, and the one of the number of sweeps are discussed in the light of noise power spectra obtained with various speeds of the peristaltic pump used as sample introduction system. Obviously, the settings proposed are probably efficient only on our own ICP-MS, but …

La production monétaire: évaluation des indices de métallurgie monétaire

2015

International audience

La fin des temps néolithiques

2004

The chapter presents the state of knowledge on the end of the Neolithic era in the department of Vaucluse. It evokes the known sites and their distribution, the chronology of the period ranging between the end of the Middle Neolithic and the Early Bronze Age and the archaeological cultures present. Several paragraphs sets of themes take stock of research concerning ceramics, tools, metal, ornament, habitat, economy, burials and art.

Jallerange (25), Groseliers, Sous les Meix, Nautrey, Le Parc de la Ferme. Du cimetière protohistorique à la villa antique : occupations de la vallée …

2011

La métallurgie du fer au Pays Basque durant l'Antiquité. Etat des connaissances dans la vallée de Baigorri (Pyrénées-Atlantiques)

2003

A study of the ancient metallurgy of iron was committed in the Basque Country, in the Baigorri valley, a rich sector whose resources were exploited before Antiquity and sometimes until the century XXth. The prospecting and the investigations undertaken revealed the existence of two mining and metallurgical districts. Their chronology is attested between the end of the Iron age and the century IVth p.C. The mines, the coal-scuttles and the métallurgie sites of the two centres of production were identified, while four workshops of reduction were the subject of a particular archaeological study. These results were confronted with the environmental data resulting from the palynological and geoc…