{"id":2724,"date":"2020-07-10T02:57:41","date_gmt":"2020-07-10T02:57:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2724"},"modified":"2020-10-14T07:28:22","modified_gmt":"2020-10-14T07:28:22","slug":"flux-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/flux-degassing\/","title":{"rendered":"D\u00e9gazage par flux"},"content":{"rendered":"

Le d\u00e9gazage au flux est un proc\u00e9d\u00e9 de coul\u00e9e destin\u00e9 \u00e0 \u00e9liminer l'hydrog\u00e8ne dissous dans la masse fondue.<\/p>\n

L'aluminium liquide dissout activement l'hydrog\u00e8ne, qui se forme par r\u00e9action chimique avec la vapeur d'eau :<\/p>\n

2Al + 3H\u2082O = Al\u2082O\u2083 + 6H<\/p>\n

La solubilit\u00e9 de l'hydrog\u00e8ne gazeux au point de fusion de l'aluminium liquide (1 220,7 \u00b0F \/ 660,4 \u00b0C) est de 0,61 pouce cube par livre (2,2 cm\u00b3 pour 100 g).
\nLorsque l'aluminium se solidifie, la solubilit\u00e9 de l'hydrog\u00e8ne gazeux diminue fortement : l'aluminium \u00e0 l'\u00e9tat solide contient seulement 0,014 pouce cube par livre (0,05 cm\u00b3 pour 100 g).
\nPar cons\u00e9quent, l'alliage d'aluminium lib\u00e8re un exc\u00e8s d'hydrog\u00e8ne au cours du processus de durcissement. Cela entra\u00eene l'apparition de d\u00e9fauts de porosit\u00e9 r\u00e9partis dans l'ensemble du m\u00e9tal solidifi\u00e9. La taille et le nombre des pores d'hydrog\u00e8ne d\u00e9pendent de la teneur initiale en hydrog\u00e8ne, de la composition de l'alliage et des conditions de solidification.<\/p>\n

Sources d'hydrog\u00e8ne dans l'aluminium liquide<\/strong><\/p>\n

Humidit\u00e9 atmosph\u00e9rique
\nCharge m\u00e9tallique humide ;
\nRev\u00eatement humide du four (creuset, poche de transfert) ;
\nOutils de moulage humide ;
\nFlux humide et autres consommables ;
\nLes produits de combustion du combustible dans le four contiennent de l'hydrog\u00e8ne.<\/p>\n

\"D\u00e9gazage<\/p>\n

M\u00e9thode d'estimation de la teneur en hydrog\u00e8ne<\/strong><\/p>\n

Durcissement lent<\/p>\n

Dans cette m\u00e9thode, une petite quantit\u00e9 d'aluminium liquide (environ 2 pouces cubes \/ 33 cm\u00b3) est vers\u00e9e dans la cavit\u00e9 de la brique r\u00e9fractaire chauff\u00e9e. L'alliage se solidifie lentement, et l'hydrog\u00e8ne lib\u00e9r\u00e9 se concentre dans la partie sup\u00e9rieure de la pi\u00e8ce moul\u00e9e sous forme de bulles fig\u00e9es. Le nombre de bulles d'hydrog\u00e8ne \u00e0 la surface de l'\u00e9chantillon est d\u00e9termin\u00e9 par la concentration en hydrog\u00e8ne.<\/p>\n

M\u00e9thode sous vide<\/p>\n

Cette m\u00e9thode quantitative consiste \u00e0 faire solidifier un \u00e9chantillon d'alliage d'aluminium dans un petit creuset \u00e0 basse pression. L'hydrog\u00e8ne dissous dans l'alliage commence \u00e0 se transformer en phase gazeuse (bulles) \u00e0 partir d'une certaine pression. Lorsque la premi\u00e8re bulle se forme, la pression et la temp\u00e9rature sont mesur\u00e9es simultan\u00e9ment. Ces param\u00e8tres permettent de d\u00e9terminer la teneur en hydrog\u00e8ne \u00e0 l'aide de graphiques num\u00e9riques.<\/p>\n

D\u00e9gazage par flux<\/p>\n

On utilise des fondants compos\u00e9s de sels contenant du chlore et du fluor pour d\u00e9gazer les alliages d'aluminium en fusion. Le flux d\u00e9gaz\u00e9<\/a> se pr\u00e9sente g\u00e9n\u00e9ralement sous forme de comprim\u00e9s.
\nLorsque les pastilles de flux sont immerg\u00e9es au fond du four \u00e0 l'aide d'une cloche perfor\u00e9e propre et pr\u00e9chauff\u00e9e, l'op\u00e9ration de d\u00e9gazage commence. Les composants du flux r\u00e9agissent avec l'aluminium pour former des compos\u00e9s gazeux (chlorure d'aluminium, fluorure d'aluminium). Le gaz se forme en bulles et remonte dans la masse fondue. La pression partielle d\u2019hydrog\u00e8ne dans la bulle form\u00e9e \u00e9tant tr\u00e8s faible, l\u2019hydrog\u00e8ne diffuse depuis l\u2019aluminium fondu vers la bulle. Les bulles s\u2019\u00e9chappent de la masse fondue, puis le gaz est \u00e9vacu\u00e9 par le syst\u00e8me d\u2019\u00e9chappement.<\/p>","protected":false},"excerpt":{"rendered":"

Flux degassing is a casting process designed to remove hydrogen dissolved in the melt. Liquid aluminum will actively dissolve hydrogen, which is formed by chemical…<\/p>","protected":false},"author":1,"featured_media":5544,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4335,4333,122,1708,4290,4289,4331,4336,136,4326,4332,835,2218,4334,644,4327,4324,4323,4325,833,123,4330,4328,4329],"class_list":["post-2724","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminium-casting-flux","tag-aluminium-degassing-tablets","tag-aluminum-casting-flux","tag-aluminum-casting-foundry-flux","tag-aluminum-degassing-flux","tag-aluminum-degassing-tablets","tag-aluminum-flux","tag-aluminum-flux-powder","tag-deslagging-agent","tag-dross-reduction","tag-flux-aluminium","tag-flux-degassing","tag-flux-for-aluminum-melting","tag-flux-for-melting-aluminum-cans","tag-molten-aluminum-refining","tag-multi-function-refining-flux","tag-refine-agent","tag-refine-flux","tag-refiner","tag-refining-agent","tag-refining-flux","tag-tundish-covering-compound","tag-tundish-covering-powder","tag-tundish-powder"],"yoast_head":"\nFlux 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