{"id":7242,"date":"2020-12-25T08:43:11","date_gmt":"2020-12-25T08:43:11","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7242"},"modified":"2020-12-25T08:43:11","modified_gmt":"2020-12-25T08:43:11","slug":"al-sr-master-alloy","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/al-sr-master-alloy\/","title":{"rendered":"Alliage-ma\u00eetre Al-Sr"},"content":{"rendered":"<p>La teneur en strontium varie entre 0,02% et 0,06% ; la limite sup\u00e9rieure s'applique au moulage au sable, tandis que la limite inf\u00e9rieure s'applique au moulage en moule m\u00e9tallique. Le strontium est souvent ajout\u00e9 sous forme d\u2019alliage-ma\u00eetre Al-Sr contenant 3%, ou sous forme d\u2019un m\u00e9lange de sels SrF\u2082 et SrCl\u2082.<\/p>\n<p>Une fois alt\u00e9r\u00e9, il ne peut pas \u00eatre raffin\u00e9 au sel de chlore afin d'\u00e9viter la formation de SrCl\u2082, et le <a href=\"http:\/\/www.alalloycasting.com\/fr\/strontium-modifier\/\">d\u00e9t\u00e9rioration due au strontium<\/a> L'effet est perdu. Seul l'argon peut \u00eatre utilis\u00e9 pour le raffinage.<\/p>\n<p>Le point d'\u00e9bullition du strontium est de 1 380 \u00b0C, ce qui est bien sup\u00e9rieur \u00e0 celui du sodium, et il est difficile \u00e0 br\u00fbler. Le d\u00e9lai d'action pour la d\u00e9gradation du moulage au sable peut atteindre 6 \u00e0 8 heures, c'est pourquoi on l'appelle \u00ab modificateur \u00e0 action prolong\u00e9e \u00bb.<\/p>\n<p>Le strontium pur est extr\u00eamement r\u00e9actif. Au contact de l'air, il s'oxyde fortement pour former une poudre blanche de SrO. Il d\u00e9compose l'hydrog\u00e8ne au contact de l'eau. Il doit \u00eatre conserv\u00e9 dans du k\u00e9ros\u00e8ne ou de l'huile de paraffine. Avant utilisation, il convient de le nettoyer \u00e0 l'ac\u00e9tone, puis de le plonger imm\u00e9diatement dans l'aluminium en fusion. L'inconv\u00e9nient de la d\u00e9gradation du strontium r\u00e9side dans la pr\u00e9sence de SrH dans le strontium : il n'est pas facile d'\u00e9liminer l'hydrog\u00e8ne, ce qui favorise les r\u00e9actions de moulage et entra\u00eene souvent la formation de piq\u00fbres dans les pi\u00e8ces moul\u00e9es.<\/p>\n<p>La d\u00e9gradation de l'alliage-ma\u00eetre Al-Sr est adapt\u00e9e aux situations o\u00f9 la dur\u00e9e de coul\u00e9e est longue.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1492\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/05\/Sr\u53d8\u8d28\u5242.jpg\" alt=\"Modificateur de strontium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/Sr\u53d8\u8d28\u5242.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/Sr\u53d8\u8d28\u5242-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Le traitement de modification \u00e0 l'aide d'un alliage-ma\u00eetre Al-Sr est g\u00e9n\u00e9ralement effectu\u00e9 apr\u00e8s l'affinage. Le point de fusion de l'agent de modification doit de pr\u00e9f\u00e9rence se situer entre la temp\u00e9rature de modification et la temp\u00e9rature de coul\u00e9e. Il se pr\u00e9sente sous forme liquide pendant le traitement de modification, ce qui favorise le d\u00e9roulement de la r\u00e9action, et se transforme en scories tr\u00e8s \u00e9paisses lors de la coul\u00e9e ; celles-ci s'\u00e9liminent facilement et ne peuvent pas se transformer en scories.<\/p>\n<p>Plus la temp\u00e9rature de d\u00e9t\u00e9rioration est \u00e9lev\u00e9e, plus la vitesse de r\u00e9action entre l'aluminium fondu et l'agent de d\u00e9t\u00e9rioration est rapide, et plus le temps de d\u00e9t\u00e9rioration n\u00e9cessaire est court. La dur\u00e9e exacte est d\u00e9termin\u00e9e par des essais.<\/p>","protected":false},"excerpt":{"rendered":"<p>The amount of strontium modified is 0.02%~0.06%, the upper limit is taken for sand casting, and the lower limit is taken for the metal type.&hellip;<\/p>","protected":false},"author":1,"featured_media":7243,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7242","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Al-Sr Master Alloy for Deterioration -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Strontium is often added in the form of AL-Sr master alloy containing 3%, or added in the form of SrF2+SrCl2 mixed salt form is added.\" \/>\n<meta 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