{"id":14974,"date":"2025-02-25T01:41:53","date_gmt":"2025-02-25T01:41:53","guid":{"rendered":"https:\/\/www.epicmicron.com\/?p=14974"},"modified":"2025-02-25T08:37:32","modified_gmt":"2025-02-25T08:37:32","slug":"factors-affecting-the-density-of-dry-pressed-green-bodies-of-special-ceramics","status":"publish","type":"post","link":"https:\/\/www.epicmicron.com\/fr\/factors-affecting-the-density-of-dry-pressed-green-bodies-of-special-ceramics\/","title":{"rendered":"Facteurs affectant la densit\u00e9 des corps verts press\u00e9s \u00e0 sec de c\u00e9ramiques sp\u00e9ciales"},"content":{"rendered":"<p>Il existe de nombreuses m\u00e9thodes pour former des c\u00e9ramiques sp\u00e9ciales, telles que le pressage \u00e0 sec, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Slip_casting\">coul\u00e9e en barbotine<\/a>, moulage par injection et coulage en gel. Le pressage \u00e0 sec offre des avantages tels qu&#039;une faible teneur en liant, un frittage direct sans s\u00e9chage. Il s&#039;agit d&#039;un processus de production simple, d&#039;une efficacit\u00e9 \u00e9lev\u00e9e, d&#039;un faible retrait du corps vert et d&#039;une production automatis\u00e9e. C&#039;est la m\u00e9thode la plus couramment utilis\u00e9e dans la production de c\u00e9ramiques sp\u00e9ciales.<\/p>\n\n\n\n<p>La recherche porte sur la pr\u00e9paration d&#039;un corps vert \u00e0 haute densit\u00e9 et \u00e0 gradient de densit\u00e9 uniforme. D&#039;une mani\u00e8re g\u00e9n\u00e9rale, les facteurs qui influent sur la densit\u00e9 du corps vert lors du pressage \u00e0 sec sont le processus de pressage \u00e0 sec et les propri\u00e9t\u00e9s de la poudre.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"712\" src=\"https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/ceramic-material-1024x712.webp\" alt=\"\" class=\"wp-image-14977\" srcset=\"https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/ceramic-material-1024x712.webp 1024w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/ceramic-material-300x209.webp 300w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/ceramic-material-768x534.webp 768w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/ceramic-material-18x12.webp 18w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/ceramic-material-600x417.webp 600w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/ceramic-material.webp 1312w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em>C\u00e9ramiques sp\u00e9ciales<\/em><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Influence du proc\u00e9d\u00e9 de pressage \u00e0 sec<\/strong><\/h2>\n\n\n\n<p>Le processus de pressage \u00e0 sec fait principalement r\u00e9f\u00e9rence \u00e0 la m\u00e9thode de pressurisation, \u00e0 la pression de pressurisation, \u00e0 la vitesse de pressurisation et au temps de maintien.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u00e9thode de pressurisation<\/h3>\n\n\n\n<p>Dans le moulage par pressage \u00e0 sec, les m\u00e9thodes de pressurisation comprennent la pressurisation unidirectionnelle et la pressurisation bidirectionnelle. Diff\u00e9rentes m\u00e9thodes de pressurisation entra\u00eeneront une transmission et une distribution diff\u00e9rentes de la pression dans le moule.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"429\" height=\"177\" src=\"https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/\u56fe\u72471.webp\" alt=\"\" class=\"wp-image-14975\" style=\"width:727px;height:auto\" srcset=\"https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/\u56fe\u72471.webp 429w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/\u56fe\u72471-300x124.webp 300w, https:\/\/www.epicmicron.com\/wp-content\/uploads\/2025\/02\/\u56fe\u72471-18x7.webp 18w\" sizes=\"(max-width: 429px) 100vw, 429px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pression de pression<\/strong><\/h3>\n\n\n\n<p>En r\u00e8gle g\u00e9n\u00e9rale, la densit\u00e9 du corps vert augmente avec l&#039;augmentation de la pression. Lors du processus de pressage de c\u00e9ramiques sp\u00e9ciales, l&#039;influence de la pression sur la densit\u00e9, la r\u00e9sistance et la porosit\u00e9 du corps vert est plus importante que celle des autres facteurs. Elle a \u00e9galement un impact substantiel sur les performances du corps vert apr\u00e8s frittage.<\/p>\n\n\n\n<p>Si la pression est trop faible, le corps vert ne peut pas atteindre une densification maximale, ce qui affecte le processus de frittage. En revanche, si la pression est trop \u00e9lev\u00e9e, des d\u00e9fauts similaires \u00e0 des fissures de couche peuvent appara\u00eetre. Ce n&#039;est que lorsque la pression est \u00e0 un niveau optimal que le corps vert id\u00e9al peut \u00eatre obtenu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Vitesse de pressurisation et temps de maintien<\/strong><\/h3>\n\n\n\n<p>La vitesse de pressurisation et le temps de maintien influencent consid\u00e9rablement les performances de l&#039;\u00e9bauche, car ils sont \u00e9troitement li\u00e9s \u00e0 la transmission de la pression et \u00e0 l&#039;\u00e9vacuation du gaz. Si la pressurisation est trop rapide et le temps de maintien trop court, le gaz ne sera pas facilement \u00e9vacu\u00e9. De m\u00eame, lorsque la pression n&#039;est pas transmise \u00e0 la profondeur requise, la force externe sera supprim\u00e9e avant la densification appropri\u00e9e, ce qui rendra difficile l&#039;obtention de la qualit\u00e9 d&#039;\u00e9bauche souhait\u00e9e. Cependant, si la vitesse de pressurisation est trop lente et le temps de maintien trop long, l&#039;efficacit\u00e9 de la production diminuera. Par cons\u00e9quent, la vitesse de pressurisation et le temps de maintien doivent \u00eatre ajust\u00e9s en fonction de la taille, de la forme et de l&#039;\u00e9paisseur de l&#039;\u00e9bauche.<\/p>\n\n\n\n<p>L&#039;objectif principal de la recherche est de savoir comment pr\u00e9parer un corps vert avec une densit\u00e9 \u00e9lev\u00e9e et un gradient de densit\u00e9 uniforme. D&#039;une mani\u00e8re g\u00e9n\u00e9rale, les facteurs affectant la densit\u00e9 du corps vert pendant le pressage \u00e0 sec comprennent le processus de pressage \u00e0 sec et les propri\u00e9t\u00e9s de la poudre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Influence du proc\u00e9d\u00e9 de pressage \u00e0 sec<\/strong><\/h2>\n\n\n\n<p>Le processus de pressage \u00e0 sec fait principalement r\u00e9f\u00e9rence \u00e0 la m\u00e9thode de pressurisation, \u00e0 la pression de pressurisation, \u00e0 la vitesse de pressurisation et au temps de maintien.<\/p>\n\n\n\n<p>Dans le moulage par pressage \u00e0 sec, les m\u00e9thodes de pressurisation comprennent la pressurisation unidirectionnelle et bidirectionnelle. Diff\u00e9rentes m\u00e9thodes de pressurisation entra\u00eenent une transmission et une distribution diff\u00e9rentes de la pression dans le moule.<\/p>\n\n\n\n<p>Les propri\u00e9t\u00e9s de la poudre se r\u00e9f\u00e8rent principalement \u00e0 la taille des particules, \u00e0 la granulom\u00e9trie, \u00e0 la teneur en liant et en eau et \u00e0 la fluidit\u00e9 de la poudre.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Taille et classement des particules<\/strong><\/h3>\n\n\n\n<p>Sous la m\u00eame pression, la densit\u00e9 de compactage vert d&#039;une poudre \u00e0 grosses particules est plus \u00e9lev\u00e9e, tandis que la densit\u00e9 de frittage d&#039;une poudre \u00e0 plus petite granulom\u00e9trie est plus \u00e9lev\u00e9e. Pour les poudres de m\u00eame granulom\u00e9trie, la densit\u00e9 de compactage vert et la densit\u00e9 de frittage augmentent toutes deux avec une pression plus \u00e9lev\u00e9e. Par cons\u00e9quent, l&#039;augmentation de la taille des particules est b\u00e9n\u00e9fique pour am\u00e9liorer la densit\u00e9 du corps vert.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Influence du liant et de la teneur en eau<\/strong><\/h3>\n\n\n\n<p>Lors du pressage \u00e0 sec de c\u00e9ramiques sp\u00e9ciales, la poudre de c\u00e9ramique doit d&#039;abord \u00eatre granul\u00e9e pour r\u00e9pondre aux exigences, puis la poudre granul\u00e9e est press\u00e9e pour former le corps vert. Les propri\u00e9t\u00e9s de la poudre granul\u00e9e, telles que la forme, la taille, la distribution granulom\u00e9trique et la fluidit\u00e9 des pseudo-particules, affecteront en fin de compte la densit\u00e9 du corps vert en c\u00e9ramique. La teneur en liant joue \u00e9galement un r\u00f4le crucial dans les performances de la poudre granul\u00e9e. Lors du pressage \u00e0 sec de c\u00e9ramiques sp\u00e9ciales, le liant sert principalement d&#039;agent de liaison, augmentant la taille des particules des pseudo-particules et am\u00e9liorant la r\u00e9sistance des particules.<\/p>\n\n\n\n<p>Si la teneur en liant est trop \u00e9lev\u00e9e pendant le processus de granulation, le coefficient de viscosit\u00e9 de la suspension augmente, ce qui entra\u00eene un angle d&#039;atomisation de pulv\u00e9risation plus petit. Cela provoque l&#039;agglom\u00e9ration des gouttelettes apr\u00e8s s\u00e9chage et granulation, ce qui conduit \u00e0 une poudre avec une large distribution granulom\u00e9trique et une mauvaise fluidit\u00e9. Par cons\u00e9quent, il devient difficile d&#039;obtenir un corps vert \u00e0 haute densit\u00e9 pendant le pressage \u00e0 sec. Inversement, si la teneur en liant est trop faible, la r\u00e9sistance du corps vert ne r\u00e9pondra pas aux exigences de traitement.<\/p>\n\n\n\n<p>La teneur en eau a \u00e9galement un impact significatif sur la densit\u00e9 du corps vert. Si la teneur en eau est trop \u00e9lev\u00e9e, le retrait au s\u00e9chage sera important, ce qui rendra difficile le contr\u00f4le de la taille du corps vert. De plus, la poudre peut adh\u00e9rer au moule pendant le moulage, ce qui affecte n\u00e9gativement la densit\u00e9 du corps vert. D&#039;autre part, si la teneur en eau est trop faible, elle entravera les performances de broyage de la poudre de granulation, ce qui rendra plus difficile l&#039;obtention d&#039;un corps vert \u00e0 haute densit\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Fluidit\u00e9 de la poudre<\/strong><\/h3>\n\n\n\n<p>Une bonne fluidit\u00e9 garantit que le frottement interne entre les particules est minimal lors du pressage \u00e0 sec de c\u00e9ramiques sp\u00e9ciales, ce qui permet \u00e0 la poudre de remplir en douceur chaque recoin du moule. Cela contribue \u00e9galement \u00e0 augmenter la densit\u00e9 de remplissage de la poudre, ce qui permet la formation d&#039;un corps c\u00e9ramique dense et uniforme sous une pression plus faible.<\/p>\n\n\n\n<p>Choisir <a href=\"https:\/\/www.epicmicron.com\/fr\">Poudre \u00e9pique<\/a>\u00a0classeur \u00e0 air pour des solutions de traitement du kaolin efficaces, \u00e9conomes en \u00e9nergie et respectueuses de l&#039;environnement !<\/p>\n\n\n\n<p>Contact us to learn more about our products!<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Broyeur \u00e0 jet \u00e0 vendre - EPIC Powder Machinery\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/XFtGtr7oNkk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>","protected":false},"excerpt":{"rendered":"<p>Il existe de nombreuses m\u00e9thodes de fabrication de c\u00e9ramiques sp\u00e9ciales, telles que le pressage \u00e0 sec, le coulage en barbotine, le moulage par injection et le coulage en gel. Le pressage \u00e0 sec offre des avantages tels qu\u2019une faible teneur en liant, un frittage direct [\u2026]<\/p>","protected":false},"author":2,"featured_media":14977,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[42],"tags":[],"class_list":["post-14974","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - 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