{"id":115,"date":"2011-07-13T14:06:02","date_gmt":"2011-07-13T14:06:02","guid":{"rendered":"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/2011\/07\/13\/japon-recherches-pour-rendre-operationnels-des-aimants-smfen-de-hautes-performances\/"},"modified":"2012-07-12T12:34:27","modified_gmt":"2012-07-12T12:34:27","slug":"japon-recherches-pour-rendre-operationnels-des-aimants-smfen-de-hautes-performances","status":"publish","type":"post","link":"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2011\/07\/13\/japon-recherches-pour-rendre-operationnels-des-aimants-smfen-de-hautes-performances\/","title":{"rendered":"Japon: recherches pour rendre op\u00e9rationnels des aimants SmFeN de hautes performances"},"content":{"rendered":"<p>&#160; <a href=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/6a00d83451b18369e2015433af3869970c-pi.jpg\"><img decoding=\"async\" alt=\"Aimant permanent SmFeN\" class=\"asset  asset-image at-xid-6a00d83451b18369e2015433af3869970c\" src=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/6a00d83451b18369e2015433af3869970c-250wi.jpg\" style=\"width: 230px;margin: 0px 5px 5px 0px\" \/><\/a> Le Japon veut absolument d\u00e9nouer sa d\u00e9pendance vis \u00e0 vis des terres-rares chinoises les plus convoit\u00e9es. Parmi celles-ci figure le <span style=\"color: #0000bf\"><strong>Dysprosium<\/strong><\/span> <a href=\"http:\/\/www.leblogenergie.com\/2010\/12\/le-r%C3%A9gime-chinois-poursuit-lorganisation-de-la-p%C3%A9nurie-en-terres-rares.html\" target=\"_self\">utilis\u00e9 dans les aimants N\u00e9odyme Fer Bore<\/a> pour am\u00e9liorer leurs performances. Ce m\u00e9tal est le talon d\u2019Achille de cette technologie, unique solution \u00e0 ce jour pour r\u00e9aliser les aimants de hautes performances n\u00e9cessaires aux moteurs de v\u00e9hicules \u00e9lectriques ou aux g\u00e9n\u00e9ratrices d&#039;\u00e9oliennes. La Chine est pratiquement aujourd&#039;hui le seul producteur de Dysprosium dans le monde et elle l&#039;exporte avec parcimonie.<\/p>\n<p>&#160;Le Japon dispose des trois types d&#039;actions classiques pour r\u00e9soudre un probl\u00e8me de disponibilit\u00e9 de cette ressource strat\u00e9gique:<\/p>\n<p>&#8211; trouver d&#039;autres approvisionnements autres que chinois, il s&#039;y emploie activement;<\/p>\n<p>&#8211; recycler les aimants permanents pour r\u00e9cup\u00e9rer les terres-rares, les proc\u00e9d\u00e9s existent mais la ressource est rare;<\/p>\n<p>-trouver des produits de substitution.<\/p>\n<p>&#160;C&#039;est sur ce troisi\u00e8me type d&#039;action radical que travaille l&#039;AIST japonais en essayant de d\u00e9finir les conditions de <span style=\"color: #0000bf\"><strong>frittage \u00e0 basse temp\u00e9rature<\/strong><\/span> de la poudre de <span style=\"color: #0000bf;font-size: 11pt\"><strong>Sm<sub>2<\/sub>Fe<sub>17<\/sub>N<sub>3<\/sub><\/strong><\/span> produite par Daido Steel. En effet au dessus d&#039;une temp\u00e9rature de frittage de 500\u00b0C la poudre perd ses propri\u00e9t\u00e9s d&#039;aimantation.<\/p>\n<p>&#160;Pour r\u00e9soudre ce probl\u00e8me de diffusion des couches de surfaces des grains qui assurent le frittage, l&#039;AIST semble avoir r\u00e9solu le probl\u00e8me en appliquant \u00e0 la fois de tr\u00e8s fortes pressions et des courants puls\u00e9s qui \u00e9chauffent la mati\u00e8re \u00e0 l&#039;interface de contact entre grains, sans d\u00e9grader les propri\u00e9t\u00e9s d&#039;aimantation \u00e0 c\u0153ur. Cette technologie de <span style=\"color: #0000bf\"><strong>frittage flash<\/strong><\/span> qui porte les grains vers les 400\u00b0C seulement, permet de rapprocher les performances des aimants ainsi obtenus de celles des produits standards les plus performants du moment (FIG., deux aimants de 15mm de diam\u00e8tres et de 6 mm d&#039;\u00e9paisseur soul\u00e8vent 30 billes d&#039;acier de 4g).<\/p>\n<p>LIRE <a href=\"http:\/\/techon.nikkeibp.co.jp\/english\/NEWS_EN\/20110710\/193231\/\" target=\"_blank\">un papier du Nikkei<\/a> sur le sujet.<\/p>\n<p>Le 13 Juillet 2011<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#160; Le Japon veut absolument d\u00e9nouer sa d\u00e9pendance vis \u00e0 vis des terres-rares chinoises les plus convoit\u00e9es. Parmi celles-ci figure le Dysprosium utilis\u00e9 dans les aimants N\u00e9odyme Fer Bore pour am\u00e9liorer leurs performances. Ce m\u00e9tal est le talon d\u2019Achille de cette technologie, unique solution \u00e0 ce jour pour r\u00e9aliser les aimants de hautes performances n\u00e9cessaires [&hellip;]<\/p>\n","protected":false},"author":341,"featured_media":22916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,4,7],"tags":[],"class_list":["post-115","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-eolien","category-vehicules-electriques"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Japon: recherches pour rendre op\u00e9rationnels des aimants SmFeN de hautes performances - leblogenergie.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2011\/07\/13\/japon-recherches-pour-rendre-operationnels-des-aimants-smfen-de-hautes-performances\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Japon: recherches pour rendre op\u00e9rationnels des aimants SmFeN de hautes performances - leblogenergie.com\" \/>\n<meta name=\"twitter:description\" content=\"&#160; Le Japon veut absolument d\u00e9nouer sa d\u00e9pendance vis \u00e0 vis des terres-rares chinoises les plus convoit\u00e9es. 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