{"id":967,"date":"2020-05-28T10:01:36","date_gmt":"2020-05-28T10:01:36","guid":{"rendered":"https:\/\/aluminiumceramicfiber.com\/?p=967"},"modified":"2026-05-11T03:36:57","modified_gmt":"2026-05-11T03:36:57","slug":"porous-ceramic-filtration","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/","title":{"rendered":"\u0627\u0644\u062a\u0631\u0634\u064a\u062d \u0628\u0627\u0644\u0633\u064a\u0631\u0627\u0645\u064a\u0643 \u0627\u0644\u0645\u0633\u0627\u0645\u064a"},"content":{"rendered":"<p>Porous ceramic is an engineered material full of controlled, interconnected voids that let fluids pass through while trapping solid particles. It shows up everywhere \u2014 water treatment, biomedical implants, catalyst supports, exhaust after-treatment, and molten metal casting. This article focuses on one specific application:<a href=\"https:\/\/www.alalloycasting.com\/ceramic-foam-filter\/\" target=\"_blank\" rel=\"noopener\"><em><strong><span class=\"su-highlight\" style=\"background:#eccb42;color:#000000\">&nbsp;\u00a0porous ceramic filtration for molten aluminum&nbsp;<\/span><\/strong><\/em><\/a>. If you work in a casthouse or foundry and need cleaner aluminum with fewer inclusions, the information below covers exactly how ceramic foam filters work, what specs matter, and how to get the most out of them.<\/p>\n<div id=\"attachment_9315\" style=\"width: 720px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9315\" class=\"wp-image-9315\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/tn4fe-z4xnc.webp\" alt=\"Different types of ceramic filters for foundry: Alumina, SiC, and Zirconia\" width=\"710\" height=\"553\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/tn4fe-z4xnc.webp 537w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/tn4fe-z4xnc-300x234.webp 300w\" sizes=\"auto, (max-width: 710px) 100vw, 710px\" \/><p id=\"caption-attachment-9315\" class=\"wp-caption-text\"><em>Different types of ceramic filters for foundry: Alumina, SiC, and Zirconia<\/em><\/p><\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u062c\u062f\u0648\u0644 \u0627\u0644\u0645\u062d\u062a\u0648\u064a\u0627\u062a<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u062a\u0628\u062f\u064a\u0644<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#What_Is_Porous_Ceramic\" >What Is Porous Ceramic?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#Is_Ceramic_Porous\" >Is Ceramic Porous?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#How_Does_a_Ceramic_Filter_Work\" >How Does a Ceramic Filter Work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#Porous_Ceramic_Filtration_in_Molten_Aluminum_Processing\" >Porous Ceramic Filtration in Molten Aluminum Processing<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#Why_Use_Ceramic_Foam_Filters_for_Aluminum_Purification\" >Why Use Ceramic Foam Filters for Aluminum Purification?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#What_Pore_Size_Should_You_Choose\" >What Pore Size Should You Choose?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#What_Size_and_Shape_of_Filter_Do_You_Need\" >What Size and Shape of Filter Do You Need?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#How_to_Get_the_Best_Results_From_Porous_Ceramic_Filtration\" >How to Get the Best Results From Porous Ceramic Filtration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#What_Material_Are_Aluminum_Ceramic_Foam_Filters_Made_From\" >What Material Are Aluminum Ceramic Foam Filters Made From?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#Characteristics_of_Porous_Ceramic_Filter_Material\" >Characteristics of Porous Ceramic Filter Material<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/porous-ceramic-filtration\/#When_Should_You_Consider_a_Higher-Performance_Filtration_System\" >When Should You Consider a Higher-Performance Filtration System?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Porous_Ceramic\"><\/span>What Is Porous Ceramic?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A porous ceramic is any ceramic body that contains a deliberate network of open or closed pores. The porosity can range from about 30 % in a dense refractory up to 90 % in a highly open-cell foam. Engineers control pore size, pore distribution, and total porosity during manufacturing to tailor the material for a specific job.<\/p>\n<p>There are three broad structural types:<\/p>\n<div class=\"overflow-x-auto\">\n<table class=\"min-w-full\">\n<thead>\n<tr>\n<th class=\"whitespace-nowrap px-3 py-2\">Structure Type<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Pore Character<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Common Production Method<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Typical Porosity Range<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"px-3 py-2\">Foam (reticulated)<\/td>\n<td class=\"px-3 py-2\">Open, interconnected cells<\/td>\n<td class=\"px-3 py-2\">Polymer-sponge replication<\/td>\n<td class=\"px-3 py-2\">80\u201390 %<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">Honeycomb<\/td>\n<td class=\"px-3 py-2\">Straight, parallel channels<\/td>\n<td class=\"px-3 py-2\">Extrusion<\/td>\n<td class=\"px-3 py-2\">50\u201370 %<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">Granular \/ sintered<\/td>\n<td class=\"px-3 py-2\">Irregular, tortuous paths<\/td>\n<td class=\"px-3 py-2\">Powder pressing + sintering<\/td>\n<td class=\"px-3 py-2\">30\u201350 %<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>For molten aluminum filtration, the\u00a0<strong>reticulated foam structure<\/strong>\u00a0dominates because its tortuous three-dimensional network forces metal to change direction repeatedly, which greatly improves inclusion capture compared with straight-through channels.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Is_Ceramic_Porous\"><\/span>Is Ceramic Porous?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Not all ceramics are porous on purpose. A fired porcelain mug, for instance, is designed to be as dense and impermeable as possible. But when ceramics\u00a0<em>are<\/em>\u00a0made porous intentionally, the result is a lightweight, chemically inert, thermally stable structure that can handle environments no polymer or metal filter could survive \u2014 including direct contact with 720 \u00b0C liquid aluminum.<\/p>\n<p>The key distinction matters:\u00a0<strong>natural porosity<\/strong>\u00a0(cracks, voids from poor sintering) weakens a ceramic, while\u00a0<strong>engineered porosity<\/strong>\u00a0(uniform, controlled, reproducible) turns it into a precision filtration tool. Every ceramic foam filter used in aluminum casting falls firmly in the engineered-porosity category.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Does_a_Ceramic_Filter_Work\"><\/span>How Does a Ceramic Filter Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A porous ceramic filter removes particles from a fluid through three complementary mechanisms:<\/p>\n<ol>\n<li><strong>Mechanical sieving<\/strong>\u00a0\u2014 particles larger than the pore opening simply cannot pass through.<\/li>\n<li><strong>Direct interception<\/strong>\u00a0\u2014 particles following a fluid streamline come close enough to a pore wall to stick.<\/li>\n<li><strong>Deep-bed capture<\/strong>\u00a0\u2014 particles much smaller than the pore size collide with interior surfaces due to inertia, gravity, or turbulent eddies, and are held there by van der Waals forces or by chemical adhesion with the ceramic surface.<\/li>\n<\/ol>\n<p>In aluminum filtration, the third mechanism is the most important. Oxide films (Al\u2082O\u2083), spinels (MgAl\u2082O\u2084), and carbide fragments are often far smaller than the filter&#8217;s nominal pore size, yet they still get captured because the tortuous path forces the metal through dozens of directional changes inside the foam. Once an inclusion touches a ceramic strut, the interfacial energy difference between the oxide particle and the ceramic surface keeps it locked in place.<\/p>\n<p>This is why a 30 PPI ceramic foam filter can trap inclusions down to 30\u201350 \u00b5m even though its individual pore openings exceed 1 mm \u2014 the filtration is not just about hole size.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Porous_Ceramic_Filtration_in_Molten_Aluminum_Processing\"><\/span>Porous Ceramic Filtration in Molten Aluminum Processing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Now let&#8217;s get into the specifics that matter inside a casthouse.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_Use_Ceramic_Foam_Filters_for_Aluminum_Purification\"><\/span>Why Use Ceramic Foam Filters for Aluminum Purification?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Aluminum picks up inclusions at every stage \u2014 furnace charging, alloying, degassing, and transfer. By the time the metal reaches the casting station, it can contain 1\u20135 ppm of particulate contamination by weight. That sounds tiny, but in a thin-gauge sheet or aerospace forging, even a few oxide clusters mean scrapped product.<\/p>\n<p>Ceramic foam filters sit in the transfer trough, usually in a dedicated filter box, and act as the last line of defense before the metal enters the mold or DC casting pit. Compared with alternatives like steel mesh screens or fiberglass cloth, a ceramic foam filter offers:<\/p>\n<ul>\n<li>Three-dimensional filtration depth, not just surface straining.<\/li>\n<li>Thermal stability up to 1 100 \u00b0C \u2014 no risk of melting, burning, or contaminating the aluminum.<\/li>\n<li>Chemical inertness with most wrought and foundry alloys.<\/li>\n<li>Consistent, repeatable performance from cast to cast.<\/li>\n<\/ul>\n<p>For a deeper look at the overall melt-cleaning process \u2014 including degassing and flux treatment steps that should come\u00a0<em>before<\/em>\u00a0filtration \u2014 see our guide to\u00a0<a class=\"text-interactive-link\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/molten-aluminum-purification-methods\/\" target=\"_blank\" rel=\"noopener noreferrer\">molten aluminum purification methods<\/a>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Pore_Size_Should_You_Choose\"><\/span>What Pore Size Should You Choose?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ceramic foam filters are rated in PPI \u2014 pores per linear inch. The higher the number, the finer the pore structure and the tighter the filtration. Here is a practical selection guide based on the end product:<\/p>\n<div class=\"overflow-x-auto\">\n<table class=\"min-w-full\">\n<thead>\n<tr>\n<th class=\"whitespace-nowrap px-3 py-2\">PPI Rating<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Nominal Pore Opening<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Best Suited For<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Inclusion Removal Efficiency<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"px-3 py-2\">10\u201320 PPI<\/td>\n<td class=\"px-3 py-2\">~2.5\u20131.5 mm<\/td>\n<td class=\"px-3 py-2\">Runner \/ gating systems, very large castings<\/td>\n<td class=\"px-3 py-2\">50\u201365 %<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">30 \u0646\u0642\u0637\u0629 \u0644\u0643\u0644 \u0628\u0648\u0635\u0629<\/td>\n<td class=\"px-3 py-2\">~1.0 mm<\/td>\n<td class=\"px-3 py-2\">Extrusion billet, general foundry castings<\/td>\n<td class=\"px-3 py-2\">70\u201380 %<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">40\u201350 PPI<\/td>\n<td class=\"px-3 py-2\">~0.6\u20130.8 mm<\/td>\n<td class=\"px-3 py-2\">Automotive sheet, high-integrity structural castings<\/td>\n<td class=\"px-3 py-2\">80\u201392 %<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">60\u201380 PPI<\/td>\n<td class=\"px-3 py-2\">~0.3\u20130.5 mm<\/td>\n<td class=\"px-3 py-2\">Aerospace plate, can stock, foil<\/td>\n<td class=\"px-3 py-2\">92\u201398 %<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>A rule of thumb we follow: start with the coarsest filter that meets your quality spec. Going finer than necessary slows pour speed, increases head-pressure requirements, and shortens filter life \u2014 all of which cost money without adding real value. If your customer specs call for a K-value below 1.0 per the\u00a0Aluminum Association&#8217;s inclusion measurement guidelines (PDF), a 50 PPI filter combined with proper upstream degassing will usually get you there.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Size_and_Shape_of_Filter_Do_You_Need\"><\/span>What Size and Shape of Filter Do You Need?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ceramic foam filters for aluminum come in standard square or rectangular footprints. Choosing the right dimensions depends on your flow rate and casting speed.<\/p>\n<div class=\"overflow-x-auto\">\n<table class=\"min-w-full\">\n<thead>\n<tr>\n<th class=\"whitespace-nowrap px-3 py-2\">Filter Dimensions (mm)<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Typical Flow Rate Range<\/th>\n<th class=\"whitespace-nowrap px-3 py-2\">Common Application<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"px-3 py-2\">178 \u00d7 178 \u00d7 50 (7\u2033)<\/td>\n<td class=\"px-3 py-2\">8\u201315 kg\/min<\/td>\n<td class=\"px-3 py-2\">Small foundry castings<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">305 \u00d7 305 \u00d7 50 (12\u2033)<\/td>\n<td class=\"px-3 py-2\">15\u201335 kg\/min<\/td>\n<td class=\"px-3 py-2\">Medium billet \/ slab<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">432 \u00d7 432 \u00d7 50 (17\u2033)<\/td>\n<td class=\"px-3 py-2\">35\u201365 kg\/min<\/td>\n<td class=\"px-3 py-2\">Large DC casting<\/td>\n<\/tr>\n<tr>\n<td class=\"px-3 py-2\">508 \u00d7 508 \u00d7 50 (20\u2033)<\/td>\n<td class=\"px-3 py-2\">55\u201390 kg\/min<\/td>\n<td class=\"px-3 py-2\">High-speed continuous casting<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Thickness matters too. A 50 mm filter provides roughly twice the inclusion holding capacity of a 25 mm filter at the same PPI, because there is more internal depth for deep-bed capture. For long casting sequences or dirty alloys with high recycle content, the thicker option pays for itself by preventing premature blinding.<\/p>\n<p>AdTech manufactures the full range of <a href=\"https:\/\/www.alalloycasting.com\/ceramic-foam-filter-pal\/\" target=\"_blank\" rel=\"noopener\"><em><strong><span class=\"su-highlight\" style=\"background:#eccb42;color:#000000\">&nbsp;\u0645\u0631\u0634\u062d \u0631\u063a\u0648\u064a \u062e\u0632\u0641\u064a&nbsp;<\/span><\/strong><\/em><\/a> sizes and PPI grades, and also supplies matched<a href=\"https:\/\/www.alalloycasting.com\/plate-filtering-unit\/\" target=\"_blank\" rel=\"noopener\"><em><strong><span class=\"su-highlight\" style=\"background:#eccb42;color:#000000\">&nbsp;\u00a0filter boxes&nbsp;<\/span>\u00a0<\/strong><\/em><\/a>designed to seat the filter securely, maintain a proper metal head, and simplify quick changeouts between casts.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/web.whatsapp.com\/send?phone=8617344611163&amp;text=\" target=\"_blank\" rel=\"noopener\"><strong><em><span class=\"su-highlight\" style=\"background:#ffffff;color:#e76d6d\">&nbsp;If your project requires the use of Porous Ceramic Foam Filter, you can contact us for a free quote.&nbsp;<\/span><\/em><\/strong><\/a><\/p>\n<div id=\"attachment_9373\" style=\"width: 670px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9373\" class=\"size-full wp-image-9373\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/Molten-Metal-Filter-Device.jpg\" alt=\"the correct position of ceramic foam filter in the plate filter box\" width=\"660\" height=\"494\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/Molten-Metal-Filter-Device.jpg 660w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/Molten-Metal-Filter-Device-300x225.jpg 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><p id=\"caption-attachment-9373\" class=\"wp-caption-text\"><em>ceramic foam filter in the plate filter box<\/em><\/p><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Get_the_Best_Results_From_Porous_Ceramic_Filtration\"><\/span>How to Get the Best Results From Porous Ceramic Filtration<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Even the best filter underperforms if it is mishandled. These practical tips come straight from casthouse experience:<\/p>\n<p><strong>Preheat the filter properly.<\/strong>\u00a0A cold ceramic foam dropped into a hot filter box will thermal-shock and crack. Preheat the filter box and filter together to at least 500\u2013600 \u00b0C before you start pouring. Some plants use embedded electric heaters in the filter box; others rely on a gas torch. Either method works, but even heating across the full face is critical.<\/p>\n<p><strong>Prime slowly.<\/strong>\u00a0Let the initial flow of metal wet the ceramic surface gently. Pouring too fast at the start pushes a slug of air through the filter and can fracture internal struts. A controlled, gradual prime also allows the first layer of captured inclusions to form a &#8220;filter cake&#8221; that actually boosts filtration efficiency for the remainder of the cast \u2014 a well-known phenomenon in deep-bed filtration theory.<\/p>\n<p><strong>Don&#8217;t re-use single-use filters.<\/strong>\u00a0It sounds obvious, but we have seen foundries try to save money by flipping a used filter and running a second cast. The captured inclusions become re-entrainment sources on the second pour, making the metal dirtier than if no filter were used at all.<\/p>\n<p><strong>Pair filtration with upstream melt cleaning.<\/strong>\u00a0A ceramic foam filter is not a substitute for degassing or fluxing \u2014 it is the final polishing step. If you skip degassing and rely on filtration alone, you will overload the filter with hydrogen-related dross and inclusions within minutes. Our page on\u00a0ceramic foam filter applications\u00a0covers the full workflow in more detail.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Material_Are_Aluminum_Ceramic_Foam_Filters_Made_From\"><\/span>What Material Are Aluminum Ceramic Foam Filters Made From?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The vast majority are manufactured from high-purity alumina (Al\u2082O\u2083), typically above 85 % alumina content, with silica and other binders making up the balance. Some specialty grades use phosphate-bonded alumina or alumina-chromia blends for extra chemical resistance with high-magnesium alloys.<\/p>\n<p>The manufacturing process follows the\u00a0<strong>polymer replica method<\/strong>: a flexible polyurethane foam template is coated with a ceramic slurry, then dried and fired in a kiln at 1 200\u20131 500 \u00b0C. The polymer burns out, leaving behind a rigid ceramic skeleton that perfectly replicates the original foam&#8217;s open-cell geometry. The result is a lightweight yet strong filter with porosity typically between 80 and 85 %.<\/p>\n<p>This process is elegant, but controlling slurry rheology and firing profile is what separates a good filter from a mediocre one. Inconsistent coating thickness leads to weak struts that break under metallostatic pressure; over-firing causes excessive shrinkage and dimensional inaccuracy. When you are evaluating suppliers, ask for crush-strength data (a quality filter at 30 PPI should exceed 1.0 MPa) and dimensional tolerance reports.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Characteristics_of_Porous_Ceramic_Filter_Material\"><\/span>Characteristics of Porous Ceramic Filter Material<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Compared with other filter materials, porous ceramics have the following characteristics as filter materials.<\/strong><\/p>\n<ul>\n<li><strong>Porous ceramic filter material has high porosity, up to 60%. The pore size is uniform and easy to control. High filtration accuracy, up to 011Lm, suitable for precision filtration of various media.<\/strong><\/li>\n<li><strong>Good acid and alkali resistance. It can be used to filter strong acids (sulfuric acid, nitric acid, hydrochloric acid), strong bases (sodium hydrochloride, etc.), and various organic solvents.<\/strong><\/li>\n<li><strong>High mechanical strength, working pressure up to 6M Pa, differential pressure up to 1M Pa.<\/strong><\/li>\n<li><strong>High-temperature resistance, good quenching, and quenching performance, working temperature up to 800 \u2103. Suitable for all kinds of high-temperature gas filtration.<\/strong><\/li>\n<li><strong>The filter element is clean, non-toxic, odorless, and free of foreign matter. It is suitable for aseptic processing operations.<\/strong><\/li>\n<li><strong>The filter element has a long service life, and long-term use, and the pore shape does not change, which is convenient for cleaning and regeneration.<\/strong><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-772 aligncenter\" src=\"https:\/\/aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/05\/Ceramic-Filters-for-Foundry-Filtration-Process.jpg\" alt=\"Ceramic Filters for Foundry Filtration Process\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/05\/Ceramic-Filters-for-Foundry-Filtration-Process.jpg 500w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/05\/Ceramic-Filters-for-Foundry-Filtration-Process-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"When_Should_You_Consider_a_Higher-Performance_Filtration_System\"><\/span>When Should You Consider a Higher-Performance Filtration System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For standard extrusion billet and general foundry work, a single-stage ceramic foam filter is perfectly adequate. But if you are casting aerospace plate, ultra-thin foil, or any product where a single inclusion means a rejected coil, consider a\u00a0<strong>two-stage setup<\/strong>: a deep-bed filter (tabular alumina media) in series with a fine-PPI ceramic foam filter downstream.<\/p>\n<p>The deep-bed unit handles the heavy lifting \u2014 large inclusions, dross fragments, and flux residue \u2014 while the CFF provides final polishing. Combined removal efficiency routinely exceeds 99 % for inclusions above 20 \u00b5m, which is difficult to achieve with either filter type alone.<\/p>\n<p>Electromagnetic separation is another option gaining traction in continuous sheet lines, though the capital cost is significantly higher. For most operations, a well-managed ceramic foam filtration stage remains the most cost-effective path to clean aluminum.<\/p>\n<p>Porous ceramic filtration is not glamorous, but it is one of the few process steps where a relatively small investment delivers a measurable, immediate improvement in metal quality. Get the filter grade right, preheat it properly, and pair it with solid melt-cleaning practices upstream, and you will see the difference on your PoDFA or LiMCA results within the first cast.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Porous ceramic is an engineered material full of controlled, interconnected voids that let fluids pass through while trapping solid particles. It shows up everywhere \u2014 water treatment, biomedical implants, catalyst supports, exhaust after-treatment, and molten metal casting. This article focuses on one specific application:. If you work in a casthouse or foundry and need cleaner [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3704,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86,44],"tags":[45,908],"class_list":["post-967","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-ceramic-foam-filter","tag-porous-ceramic-filter","tag-porous-ceramic-filtration-principle"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Porous Ceramic Filtration Principle,Porous Ceramic Filter<\/title>\n<meta name=\"description\" content=\"Porous ceramic filtration is a combination of adsorption(liquid aluminum), surface filtration, and deep filtration. 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