{"id":114441,"date":"2022-02-07T00:38:38","date_gmt":"2022-02-06T23:38:38","guid":{"rendered":"https:\/\/material-properties.org\/molybdene-et-tungstene-comparaison-proprietes\/"},"modified":"2022-03-23T07:23:04","modified_gmt":"2022-03-23T06:23:04","slug":"molybdene-et-tungstene-comparaison-proprietes","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/molybdene-et-tungstene-comparaison-proprietes\/","title":{"rendered":"Molybd\u00e8ne et Tungst\u00e8ne – Comparaison – Propri\u00e9t\u00e9s"},"content":{"rendered":"

Cet article contient une comparaison des principales propri\u00e9t\u00e9s thermiques et atomiques du molybd\u00e8ne et du tungst\u00e8ne, deux \u00e9l\u00e9ments chimiques comparables du tableau p\u00e9riodique.\u00a0Il contient \u00e9galement des descriptions de base et des applications des deux \u00e9l\u00e9ments.\u00a0Molybd\u00e8ne vs Tungst\u00e8ne.<\/em><\/p>\n

\"molybd\u00e8ne<\/p>\n

\n
<\/span>Comparer le molybd\u00e8ne avec un autre \u00e9l\u00e9ment<\/div>
\n
<\/div>\n

\"Chrome<\/a><\/p>\n

\"Tungst\u00e8ne<\/a><\/p>\n<\/div><\/div>\n<\/div><\/div>\n

\n
<\/span>Comparer le tungst\u00e8ne avec un autre \u00e9l\u00e9ment<\/div>
\n
<\/div>\n

\"Titane<\/a><\/p>\n

\"Chrome<\/a><\/p>\n

\"Cobalt<\/a><\/p>\n

\"Zirconium<\/a><\/p>\n

\"Molybd\u00e8ne<\/a><\/p>\n

\"Platine<\/a><\/p>\n

\"Rh\u00e9nium<\/a><\/p>\n

\"Or<\/a><\/p>\n

\"Iridium<\/a><\/p>\n<\/div><\/div>\n<\/div><\/div>\n

<\/div>\n
\n

Molybd\u00e8ne et tungst\u00e8ne – \u00c0 propos des \u00e9l\u00e9ments<\/h2>\n<\/div><\/div>\n
\n
\"\"<\/div>
\n

Molybd\u00e8ne<\/h3>\n

Le molybd\u00e8ne, un m\u00e9tal argent\u00e9 avec une teinte grise, a le sixi\u00e8me point de fusion le plus \u00e9lev\u00e9 de tous les \u00e9l\u00e9ments.\u00a0Il forme facilement des carbures durs et stables dans les alliages et, pour cette raison, la majeure partie de la production mondiale de l’\u00e9l\u00e9ment (environ 80 %) est utilis\u00e9e dans les alliages d’acier, y compris les alliages \u00e0 haute r\u00e9sistance et les superalliages.
\n<\/p><\/div>

<\/div><\/div>\n<\/div><\/div>\n
\n
\"\"<\/div>
\n

Tungst\u00e8ne<\/h3>\n

Le tungst\u00e8ne est un m\u00e9tal rare pr\u00e9sent naturellement sur Terre presque exclusivement dans des compos\u00e9s chimiques.\u00a0Le tungst\u00e8ne est un mat\u00e9riau intrins\u00e8quement cassant et dur, ce qui le rend difficile \u00e0 travailler.<\/p>\n<\/div>

<\/div><\/div>\n<\/div><\/div>\n
<\/div>\n
\n

\"Molybd\u00e8ne<\/p>\n<\/div><\/div>\n

\n

\"Tungst\u00e8ne<\/p>\n

<\/p><\/div><\/div>\n

Source : www.luciteria.com<\/p>\n

<\/div>\n
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Molybd\u00e8ne et Tungst\u00e8ne – Applications<\/h2>\n<\/div><\/div>\n
\n
\n
\n

Molybd\u00e8ne<\/a><\/h3>\n

Environ 86 % du molybd\u00e8ne produit est utilis\u00e9 en m\u00e9tallurgie, le reste \u00e9tant utilis\u00e9 dans des applications chimiques.\u00a0L’utilisation mondiale estim\u00e9e est l’acier de construction 35\u00a0%, l’acier inoxydable 25\u00a0%, les produits chimiques 14\u00a0%, les aciers \u00e0 outils et rapides 9\u00a0%, la fonte 6\u00a0%, le m\u00e9tal \u00e9l\u00e9mentaire de molybd\u00e8ne 6\u00a0% et les superalliages 5\u00a0%.\u00a0Le molybd\u00e8ne (environ 0,50 \u00e0 8,00 %) lorsqu’il est ajout\u00e9 \u00e0 un acier \u00e0 outils le rend plus r\u00e9sistant aux hautes temp\u00e9ratures.\u00a0Le molybd\u00e8ne augmente la trempabilit\u00e9 et la r\u00e9sistance, en particulier \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es en raison du point de fusion \u00e9lev\u00e9 du molybd\u00e8ne.\u00a0Le molybd\u00e8ne est unique dans la mesure o\u00f9 il augmente les r\u00e9sistances \u00e0 la traction et au fluage \u00e0 haute temp\u00e9rature de l’acier.\u00a0Les anodes en molybd\u00e8ne remplacent le tungst\u00e8ne dans certaines sources de rayons X basse tension pour des utilisations sp\u00e9cialis\u00e9es telles que la mammographie.\u00a0L’isotope radioactif molybd\u00e8ne-99 est utilis\u00e9 pour g\u00e9n\u00e9rer du techn\u00e9tium-99m, utilis\u00e9 pour l’imagerie m\u00e9dicale.<\/p>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n

\n
\n
\n

Tungst\u00e8ne<\/a><\/h3>\n

Le tungst\u00e8ne est un m\u00e9tal largement utilis\u00e9.\u00a0Environ la moiti\u00e9 du tungst\u00e8ne est consomm\u00e9e pour la production de mat\u00e9riaux durs – \u00e0 savoir le carbure de tungst\u00e8ne – le reste \u00e9tant principalement utilis\u00e9 dans les alliages et les aciers.\u00a0L’exploitation mini\u00e8re et le traitement des min\u00e9raux exigent des machines et des composants r\u00e9sistants \u00e0 l’usure, car les \u00e9nergies et les masses des corps en interaction sont importantes.\u00a0Pour cela, les mat\u00e9riaux les plus r\u00e9sistants \u00e0 l’usure doivent \u00eatre utilis\u00e9s.\u00a0Par exemple, le carbure de tungst\u00e8ne est largement utilis\u00e9 dans l’exploitation mini\u00e8re dans les tr\u00e9pans de forage \u00e0 marteau sup\u00e9rieur, les marteaux de fond de trou, les couteaux \u00e0 rouleaux, les burins de charrue \u00e0 longue paroi, les pics de cisaillement \u00e0 longue paroi, les al\u00e9soirs de forage ascendant et les tunneliers.\u00a0Les 40 % restants sont g\u00e9n\u00e9ralement utilis\u00e9s pour fabriquer divers alliages et aciers sp\u00e9ciaux, des \u00e9lectrodes, des filaments, des fils, ainsi que divers composants pour des applications \u00e9lectriques, \u00e9lectroniques, de chauffage, d’\u00e9clairage et de soudage.<\/p>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n

\n

Molybd\u00e8ne et tungst\u00e8ne – Comparaison dans le tableau<\/h2>\n<\/div><\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00c9l\u00e9ment<\/td>\nMolybd\u00e8ne<\/b><\/td>\nTungst\u00e8ne<\/b><\/td>\n<\/tr>\n
Densit\u00e9<\/td>\n10,28 g\/cm3<\/strong><\/td>\n19,25 g\/cm3<\/strong><\/td>\n<\/tr>\n
R\u00e9sistance \u00e0 la traction ultime<\/td>\n324 MPa<\/strong><\/td>\n980 MPa<\/strong><\/td>\n<\/tr>\n
Limite d’\u00e9lasticit\u00e9<\/td>\nN \/ A<\/strong><\/td>\n750 MPa<\/strong><\/td>\n<\/tr>\n
Module de Young<\/td>\n329 GPa<\/strong><\/td>\n411 GPa<\/strong><\/td>\n<\/tr>\n
\u00c9chelle de Mohs<\/td>\n5,5<\/strong><\/td>\n7,5<\/strong><\/td>\n<\/tr>\n
Duret\u00e9 Brinell<\/td>\n1500 MPa<\/strong><\/td>\n3000 MPa<\/strong><\/td>\n<\/tr>\n
Duret\u00e9 Vickers<\/td>\n1530 MPa<\/strong><\/td>\n3500 MPa<\/strong><\/td>\n<\/tr>\n
Point de fusion<\/td>\n2623\u00b0C<\/strong><\/td>\n3410\u00b0C<\/strong><\/td>\n<\/tr>\n
Point d’\u00e9bullition<\/td>\n4639\u00b0C<\/strong><\/td>\n59300\u00b0C<\/strong><\/td>\n<\/tr>\n
Conductivit\u00e9 thermique<\/td>\n138 W\/mK<\/strong><\/td>\n170 W\/mK<\/strong><\/td>\n<\/tr>\n
Coefficient de dilatation thermique<\/td>\n4,8 \u00b5m\/mK<\/strong><\/td>\n4,5 \u00b5m\/mK<\/strong><\/td>\n<\/tr>\n
Chaleur sp\u00e9cifique<\/td>\n0,25 J\/g\u00b7K<\/span><\/strong><\/td>\n0,13 J\/g\u00b7K<\/strong><\/td>\n<\/tr>\n
Temp\u00e9rature de fusion<\/td>\n32 kJ\/mole<\/strong><\/td>\n35,4 kJ\/mole<\/strong><\/td>\n<\/tr>\n
Chaleur de vaporisation<\/td>\n598 kJ\/mol<\/span><\/strong><\/td>\n824 kJ\/mol<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Cet article contient une comparaison des principales propri\u00e9t\u00e9s thermiques et atomiques du molybd\u00e8ne et du tungst\u00e8ne, deux \u00e9l\u00e9ments chimiques comparables du tableau p\u00e9riodique.\u00a0Il contient \u00e9galement des descriptions de base et des applications des deux \u00e9l\u00e9ments.\u00a0Molybd\u00e8ne vs Tungst\u00e8ne. Source : www.luciteria.com<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"yoast_head":"\nMolybd\u00e8ne et Tungst\u00e8ne - Comparaison - Propri\u00e9t\u00e9s - Material Properties<\/title>\n<meta name=\"description\" content=\"Cet article contient une comparaison des principales propri\u00e9t\u00e9s thermiques et atomiques du molybd\u00e8ne et du tungst\u00e8ne, deux \u00e9l\u00e9ments chimiques comparables du tableau p\u00e9riodique. 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