{"id":6524,"date":"2020-11-18T03:32:20","date_gmt":"2020-11-18T03:32:20","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6524"},"modified":"2020-11-18T03:32:20","modified_gmt":"2020-11-18T03:32:20","slug":"porous-ceramics-application","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/porous-ceramics-application\/","title":{"rendered":"C\u00e9ramiques poreuses"},"content":{"rendered":"

Gr\u00e2ce aux progr\u00e8s r\u00e9alis\u00e9s dans les proc\u00e9d\u00e9s de fabrication, les c\u00e9ramiques ont pris des formes de plus en plus innovantes, telles que les structures poreuses. En raison du grand nombre de pores interconnect\u00e9s ou ferm\u00e9s pr\u00e9sents dans les c\u00e9ramiques poreuses, celles-ci se caract\u00e9risent par une faible densit\u00e9 volumique, une surface sp\u00e9cifique \u00e9lev\u00e9e et une faible conductivit\u00e9 thermique. Ces derni\u00e8res ann\u00e9es, les applications des c\u00e9ramiques poreuses se sont particuli\u00e8rement illustr\u00e9es dans les domaines de la protection de l'environnement, de la fusion, de la chimie et dans d'autres secteurs.<\/p>\n

Applications des c\u00e9ramiques poreuses<\/strong><\/p>\n

La grande surface sp\u00e9cifique des c\u00e9ramiques poreuses leur conf\u00e8re une bonne capacit\u00e9 d'adsorption et une bonne activit\u00e9. Utilis\u00e9es comme support de catalyseur, elles permettent d'augmenter la surface de contact effective et d'am\u00e9liorer l'effet catalytique. Parall\u00e8lement, gr\u00e2ce \u00e0 leur excellente r\u00e9sistance aux chocs thermiques et \u00e0 la corrosion, elles peuvent \u00eatre utilis\u00e9es dans des environnements extr\u00eamement difficiles.<\/p>\n

Un excellent support de catalyseur doit non seulement pr\u00e9senter des propri\u00e9t\u00e9s chimiques stables et r\u00e9sister \u00e0 la corrosion caus\u00e9e par les acides, les alcalis et d\u2019autres solvants organiques, mais aussi supporter d\u2019importantes variations de temp\u00e9rature au cours du processus de production sans former de scories ; le plus important est que sa surface sp\u00e9cifique soit suffisamment grande. Sa densit\u00e9 doit \u00eatre aussi faible que possible afin de r\u00e9duire son poids. Si le gaz peut former des impulsions lors de son passage, l'effet catalytique sera meilleur.<\/p>\n

Filtration et s\u00e9paration<\/strong><\/p>\n

Ce que l'on appelle la \u00ab s\u00e9paration par filtration \u00bb consiste \u00e0 s\u00e9parer des particules solides en suspension dans un liquide ou un gaz, ou encore deux liquides non miscibles.<\/p>\n

Le filtre en c\u00e9ramique poreuse<\/a> Ce dispositif se caract\u00e9rise par une grande surface de filtration et une efficacit\u00e9 de filtration \u00e9lev\u00e9e. Gr\u00e2ce \u00e0 sa r\u00e9sistance aux hautes temp\u00e9ratures, \u00e0 l'abrasion et \u00e0 la corrosion, il est utilis\u00e9 non seulement dans des applications classiques telles que le traitement de l'eau et la filtration des gaz, mais \u00e9galement dans certains domaines o\u00f9 les temp\u00e9ratures sont \u00e9lev\u00e9es. Il peut \u00e9galement \u00eatre utilis\u00e9, par exemple, pour la filtration des m\u00e9taux en fusion.<\/p>\n

\"C\u00e9ramiques<\/p>\n

De nos jours, avec le renforcement des exigences de qualit\u00e9 applicables aux produits en aluminium, l'utilisation de filtre en mousse c\u00e9ramique<\/a> L'utilisation de plaques a \u00e9galement \u00e9t\u00e9 encourag\u00e9e. La porosit\u00e9 de la plaque filtrante en c\u00e9ramique se situe entre 80% et 90%, ce qui permet d'\u00e9liminer efficacement les inclusions fines de l'ordre du micron pr\u00e9sentes dans l'aluminium fondu, ce que le proc\u00e9d\u00e9 conventionnel ne permet pas. Parall\u00e8lement, l\u2019\u00e9limination de ces fines inclusions r\u00e9duit le nombre effectif de noyaux cristallins dans l\u2019aluminium fondu. L\u2019aluminium liquide se nucl\u00e9ate et cro\u00eet ainsi dans des conditions de surfroidissement relativement importantes, ce qui raccourcit le temps de solidification et affine la structure. De plus, gr\u00e2ce \u00e0 l\u2019adsorption, la plaque filtrante en c\u00e9ramique permet \u00e9galement d\u2019\u00e9liminer les \u00e9l\u00e9ments nocifs (Na, K) pr\u00e9sents dans l\u2019aluminium fondu. Lors de la filtration d\u2019un alliage d\u2019aluminium, la plaque filtrante est chauff\u00e9e et se dilate instantan\u00e9ment ; elle doit donc pr\u00e9senter un faible coefficient de dilatation thermique afin de ne pas se fissurer sous l\u2019effet de la chaleur.<\/p>","protected":false},"excerpt":{"rendered":"

With the advancement of the preparation process, ceramics have acquired more novel forms, such as porous structures. Due to the large number of interconnected or…<\/p>","protected":false},"author":1,"featured_media":6525,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nPorous Ceramics Application | Porous Ceramic Filter<\/title>\n<meta name=\"description\" content=\"Due to the large number of interconnected or closed pores in porous ceramics, it has low volume density, high specific surface area.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/porous-ceramics-application\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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