{"id":25810,"date":"2023-05-06T06:20:39","date_gmt":"2023-05-06T06:20:39","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=25810"},"modified":"2023-05-06T06:20:39","modified_gmt":"2023-05-06T06:20:39","slug":"refractory-clay","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/refractory-clay\/","title":{"rendered":"argile r\u00e9fractaire"},"content":{"rendered":"

D\u00e9finition de l'argile r\u00e9fractaire<\/strong><\/p>\n

Il est compos\u00e9 de poudre r\u00e9fractaire, d'un liant et d'adjuvants. Le mortier r\u00e9fractaire ordinaire, constitu\u00e9 de poudre de clinker r\u00e9fractaire et d'une quantit\u00e9 appropri\u00e9e d'argile plastique servant de liant et de plastifiant, pr\u00e9sente une faible r\u00e9sistance \u00e0 temp\u00e9rature ambiante, mais acquiert une r\u00e9sistance plus \u00e9lev\u00e9e lorsqu'il forme une liaison c\u00e9ramique \u00e0 haute temp\u00e9rature. Le mortier r\u00e9fractaire \u00e0 liaison chimique, qui utilise des liants hydrauliques, durcissant \u00e0 l'air ou thermodurcissables, provoque une certaine r\u00e9action chimique et durcit avant que la temp\u00e9rature ne soit suffisamment basse pour permettre la formation d'une liaison c\u00e9ramique.
\nLa granulom\u00e9trie de la boue r\u00e9fractaire varie en fonction des exigences d'utilisation ; sa granulom\u00e9trie maximale est g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 1 mm, et certaines boues pr\u00e9sentent une granulom\u00e9trie inf\u00e9rieure \u00e0 0,5 mm, voire plus fine.
\nLe mat\u00e9riau constitutif du mortier r\u00e9fractaire doit \u00eatre compatible avec celui des produits r\u00e9fractaires de ma\u00e7onnerie. Outre son utilisation comme mat\u00e9riau de jointoiement, le mortier r\u00e9fractaire peut \u00e9galement servir de rev\u00eatement protecteur pour les rev\u00eatements internes, qu'il soit appliqu\u00e9 \u00e0 la truelle ou par projection.<\/p>\n

Caract\u00e9ristiques et utilisation de la boue r\u00e9fractaire :
\n1. Bonne plasticit\u00e9 et facilit\u00e9 de mise en \u0153uvre ;
\n2. Grande force d'adh\u00e9rence et forte r\u00e9sistance \u00e0 la corrosion ;
\n3. R\u00e9fractarit\u00e9 \u00e9lev\u00e9e, jusqu'\u00e0 1 650 \u00b0C \u00b1 50 \u00b0C ;
\n4. Bonne r\u00e9sistance \u00e0 la p\u00e9n\u00e9tration des scories ;
\n5. Bonne exfoliation thermique. La boue r\u00e9fractaire est principalement utilis\u00e9e dans les fours \u00e0 coke, les fours \u00e0 verre, les hauts fourneaux, les g\u00e9n\u00e9rateurs de vent chaud et d'autres fours industriels. Elle trouve des applications dans les secteurs suivants : m\u00e9tallurgie, mat\u00e9riaux de construction, machines, p\u00e9trochimie, verre, chaudi\u00e8res, \u00e9nergie \u00e9lectrique, acier, ciment, etc.
\nDensit\u00e9 apparente : 1,8 \u00e0 2,2 g\/cm\u00b3.
\nIl existe de nombreux types de mat\u00e9riaux r\u00e9fractaires, que l'on classe g\u00e9n\u00e9ralement en mat\u00e9riaux r\u00e9fractaires ordinaires (1 580-1 770 \u00b0C), mat\u00e9riaux r\u00e9fractaires avanc\u00e9s (1 770-2 000 \u00b0C) et mat\u00e9riaux r\u00e9fractaires de tr\u00e8s haute r\u00e9sistance (au-del\u00e0 de 2 000 \u00b0C) en fonction de leur r\u00e9sistance \u00e0 la chaleur ; en fonction de leurs propri\u00e9t\u00e9s chimiques, ils sont class\u00e9s en mat\u00e9riaux r\u00e9fractaires acides, neutres et basiques. Il existe par ailleurs des mat\u00e9riaux r\u00e9fractaires destin\u00e9s \u00e0 des applications sp\u00e9cifiques.<\/p>\n

Adtech produit principalement filtre en mousse c\u00e9ramique<\/a>, unit\u00e9 de d\u00e9gazage<\/a><\/p>\n

Les boues r\u00e9fractaires peuvent \u00eatre class\u00e9es en boues r\u00e9fractaires \u00e0 base d'argile, \u00e0 haute teneur en alumine, \u00e0 base de silicium, \u00e0 base de magn\u00e9sie, etc., en fonction de la composition des mat\u00e9riaux qui les composent. En fonction des liants utilis\u00e9s, les boues r\u00e9fractaires peuvent \u00eatre class\u00e9es dans les trois cat\u00e9gories suivantes :
\n(1) L'argile r\u00e9fractaire \u00e0 liant vitrifi\u00e9 est un m\u00e9lange compos\u00e9 de granulats fins r\u00e9fractaires et d'un liant vitrifi\u00e9 (argile plastique). Elle est livr\u00e9e \u00e0 l'\u00e9tat sec et doit \u00eatre mise en \u0153uvre apr\u00e8s ajout d'eau. Elle durcit par liaison c\u00e9ramique \u00e0 haute temp\u00e9rature.
\n(2) Ciment r\u00e9fractaire \u00e0 liant hydraulique : il s'agit d'un m\u00e9lange compos\u00e9 de granulats fins r\u00e9fractaires et d'un liant hydraulique (ciment) qui assure principalement la liaison. Il est livr\u00e9 \u00e0 l'\u00e9tat sec et peut \u00eatre utilis\u00e9 apr\u00e8s ajout d'eau, sans n\u00e9cessiter de chauffage lors du durcissement.
\n(3) L'argile r\u00e9fractaire \u00e0 liant chimique est un m\u00e9lange compos\u00e9 de granulats fins r\u00e9fractaires et de liants chimiques (inorganiques, organo-inorganiques, organiques). Elle est livr\u00e9e sous forme de p\u00e2te ou \u00e0 l'\u00e9tat sec, et durcit \u00e0 une temp\u00e9rature inf\u00e9rieure \u00e0 la temp\u00e9rature de liaison de la c\u00e9ramique. En fonction de la temp\u00e9rature de durcissement, cette boue r\u00e9fractaire peut \u00eatre class\u00e9e en deux cat\u00e9gories : les boues durcissant \u00e0 l'air et les boues thermodurcissables. Les boues r\u00e9fractaires durcissant \u00e0 l'air sont souvent pr\u00e9par\u00e9es \u00e0 l'aide de liants durcissant \u00e0 l'air, tels que le verre soluble. La boue r\u00e9fractaire thermodurcissable est souvent formul\u00e9e \u00e0 partir de liants thermodurcissables tels que l\u2019acide phosphorique ou le phosphate. Une fois durcie, ce type de boue r\u00e9fractaire thermodurcissable pr\u00e9sente non seulement une r\u00e9sistance \u00e9lev\u00e9e \u00e0 diff\u00e9rentes temp\u00e9ratures, mais aussi un faible retrait, des joints \u00e9tanches et une forte r\u00e9sistance \u00e0 la corrosion.
\nIl existe deux types d'argile r\u00e9fractaire : les produits finis et les produits semi-finis. La \u00ab boue r\u00e9fractaire pr\u00eate \u00e0 l'emploi \u00bb est une boue dont les mati\u00e8res premi\u00e8res et le clinker ont \u00e9t\u00e9 pr\u00e9par\u00e9s en proportions ad\u00e9quates par le fabricant ; il suffit de la m\u00e9langer avec de l'eau conform\u00e9ment \u00e0 la norme lors de son utilisation sur chantier. La boue r\u00e9fractaire semi-finie ou non finie est constitu\u00e9e de mati\u00e8res premi\u00e8res et de clinker qui ne sont pas m\u00e9lang\u00e9s entre eux. Lors de l'utilisation sur chantier, m\u00e9langez soigneusement les ingr\u00e9dients en respectant la composition de chaque type de p\u00e2te, ajoutez de l'eau et remuez uniform\u00e9ment conform\u00e9ment aux consignes.<\/p>","protected":false},"excerpt":{"rendered":"

Definition of refractory clay It is composed of refractory powder, binder, and admixture. Ordinary refractory mud made of refractory clinker powder plus an appropriate amount…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233,138],"tags":[21],"class_list":["post-25810","post","type-post","status-publish","format-standard","hentry","category-blog","category-seo","tag-ceramic-foam-filter"],"yoast_head":"\nrefractory clay<\/title>\n<meta name=\"description\" content=\"Definition of refractory clay. It is composed of refractory powder, binder, and admixture. 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