filtre en mousse c\u00e9ramique<\/a>, pr\u00e9sente une faible r\u00e9sistance aux chocs thermiques en raison des contraintes thermiques \u00e9lev\u00e9es g\u00e9n\u00e9r\u00e9es par la combinaison d\u2019un gradient thermique d\u00fb \u00e0 un chauffage in\u00e9gal et d\u2019un coefficient de dilatation thermique \u00e9lev\u00e9. Lors du pr\u00e9chauffage et du premier contact avec le m\u00e9tal en fusion, le mat\u00e9riau du filtre en mousse c\u00e9ramique peut subir des fissures ou un \u00e9caillage dus au choc thermique, ce qui entra\u00eene la lib\u00e9ration de particules du mat\u00e9riau du filtre dans le lingot ou la billette, o\u00f9 elles se transforment en inclusions. De plus, lorsque le filtre en mousse d\u2019alumine se trouve dans une cuvette de filtration exigu\u00eb pendant le pr\u00e9chauffage et l\u2019utilisation, le taux de dilatation thermique \u00e9lev\u00e9 du filtre peut entra\u00eener des contraintes de compression lat\u00e9rales importantes, ce qui provoque des dommages par compression au niveau du filtre.<\/p>\n![\"\"](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/12\/Use-of-Ceramic-Filter.jpg\")
<\/p>\n
L'orthophosphate d'aluminium (Al(H\u2082PO\u2084)\u2083) est largement utilis\u00e9 comme liant r\u00e9fractaire dans l'industrie m\u00e9tallurgique. Il pr\u00e9sente une bonne r\u00e9sistance \u00e0 l'\u00e9tat cru pendant le processus de s\u00e9chage \u00e0 une temp\u00e9rature relativement basse, un faible retrait de l'\u00e9bauche crue et une bonne r\u00e9sistance lors de la cuisson ult\u00e9rieure. L'orthophosphate d'aluminium est relativement bon march\u00e9, largement disponible et n\u00e9cessite une temp\u00e9rature de cuisson relativement basse (1 100 \u00b0C) pour obtenir la liaison finale au phosphate d'aluminium (AlPO\u2084). Pour ces raisons, et en raison du co\u00fbt relativement faible de l'orthophosphate d'aluminium, ce mat\u00e9riau est largement utilis\u00e9 pour fabriquer des filtres en mousse c\u00e9ramique destin\u00e9s \u00e0 la filtration de l'aluminium fondu.<\/p>\n
Cependant, la liaison de phosphate d'aluminium ainsi form\u00e9e r\u00e9agit avec le magn\u00e9sium pr\u00e9sent dans de nombreux alliages d'aluminium disponibles dans le commerce et ne convient donc pas aux alliages d'aluminium-magn\u00e9sium. Le magn\u00e9sium pr\u00e9sent dans l'aluminium fondu est tr\u00e8s r\u00e9actif, poss\u00e8de une pression de vapeur relativement \u00e9lev\u00e9e et p\u00e9n\u00e8tre facilement dans n'importe quelle matrice r\u00e9fractaire. Il r\u00e9agit facilement avec la quasi-totalit\u00e9 des mat\u00e9riaux oxyd\u00e9s courants.<\/p>","protected":false},"excerpt":{"rendered":"
The use of alumina particles in ceramic foam filter seems to be an obvious choice for molten aluminum and its alloys filtration. Alumina is relatively…<\/p>","protected":false},"author":1,"featured_media":11785,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[13043,21],"class_list":["post-11784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-filter-for-molten-aluminum","tag-ceramic-foam-filter"],"yoast_head":"\n
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