{"id":3159,"date":"2018-03-20T02:57:43","date_gmt":"2018-03-20T02:57:43","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=3159"},"modified":"2025-01-15T08:34:46","modified_gmt":"2025-01-15T08:34:46","slug":"flux-in-metallurgy","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/es\/flux-in-metallurgy\/","title":{"rendered":"El fundente en metalurgia"},"content":{"rendered":"

El fundente en metalurgia<\/h1>\n

El fundente en metalurgia<\/h2>\n

Covering and Drossing<\/a> Fluxes<\/h3>\n

(disponibles en versiones con bajo contenido en fl\u00faor, para bajas y altas temperaturas, y sin sodio)<\/strong><\/p>\n

Aluminum is chemically very active. A tough film or skin of aluminum oxide forms quickly on all freshly exposed surfaces, especially in the molten state. Scrap or ingot additions to the melt, stirring, and agitation cause aluminum oxide to be suspended in the melt. Including these oxides in the cast product may lead to defects, so they must be removed from the melt. Most oxides are of aluminum, but alloying elements such as magnesium, iron, copper, and titanium also can form their oxides.<\/strong><\/p>\n

Flux Used In Metallurgy – Cleaning fluxes are necessary to remove oxides from the melt, while cover fluxes<\/a> act as a barrier for the surface of the melt against oxide formation. The same flux can generally be used for both purposes.<\/strong><\/p>\n

\"Fundente<\/p>\n

Fluoride compounds in the flux increase its effectiveness and allow it to be used at lower temperatures. However, fluorides can release harmful fumes, so for environmental reasons, some foundries prefer to use low-fluoride fluxes. Sodium-free fluxes are used in hypereutectic alloys (>12% silicon content), since sodium can interfere with phosphorus grain refining. The fluxes available for different temperature ranges differ primarily in their melting points.<\/strong><\/p>\n

Flujos exot\u00e9rmicos<\/h3>\n

Fluxes of this type are applied to dross to release metal trapped in the dross and thus reduce melting losses.<\/p>\n

Fundentes para la limpieza de las paredes de los hornos<\/h3>\n

Flux Used In Metallurgy – Oxide buildup on furnace walls tends to deteriorate the life of the furnace, as well as making work more difficult and decreasing the volume of the furnace. If the buildup is not kept in check, the oxides can form corundum, a material that is very difficult to remove. Wall cleaning fluxes soften the buildup and make it easier to scrape away.<\/strong><\/p>\n

Flujos desgasificantes<\/a><\/h3>\n

Hydrogen, found in the foundry primarily due to the decomposition of water vapor, is very soluble in liquid aluminum alloys, but much less so in the solid phase. When aluminum solidifies, the excess dissolved hydrogen comes out of the solution and forms bubbles, from pinhole size to much larger sizes. The metal which has not been degassed before casting is vulnerable to this type of defect. Degassing fluxes remove hydrogen, and also oxides, and other impurities.<\/strong><\/p>\n

\"Flujos<\/p>\n

Fundentes modificadores de sodio<\/h3>\n

For hypoeutectic alloys containing silicon, the addition of sodium or strontium results in a modified silicon structure that brings about improvement in mechanical properties (tensile strength or elongation) and castability. In modified alloys casting shrinkage during solidification is dispersed instead of localized in large cavities. Sodium modification is also very effective in the prevention of shrinkage porosity.<\/strong><\/p>\n

Flux Used In Metallurgy – Powder and tablet-type fluxes are available. These fluxes are all much more environmentally friendly than sodium metal. A recently developed type (the Sodium DonutTM System) is immune to the problem of fading, which due to sodium volatility was at one time an inevitable aspect of modifying.<\/strong><\/p>\n

Grain Refining Fluxe<\/a>s<\/h3>\n

Grain size in aluminum alloys refers to the size of individual aluminum crystals in a cast piece. The size of these crystals is directly related to the number of grains or nuclei formed in the earliest stages of solidification; the more grains, the finer the grain size. Coarse grain size increases the difficulty of feeding and lowers the soundness and mechanical properties of a casting. Grain refining makes the grains smaller by increasing the number of crystallization nuclei early in solidification, much like seeding a rain cloud with dry ice.<\/strong><\/p>\n

\"Fundentes<\/p>\n

Entre las ventajas del refinado del grano se incluyen:<\/strong>
\nDispersi\u00f3n de la porosidad.<\/strong>
\nPrevenci\u00f3n de las grietas por calor.<\/strong>
\nImproved pressure tightness through the prevention of blowholes.<\/strong>
\nEl titanio, el boro y el circonio son agentes de refinamiento del grano muy utilizados. En el caso de las aleaciones hipereut\u00e9cticas, en las que el silicio se precipita antes que el aluminio, se utiliza el f\u00f3sforo para refinar el grano.<\/strong><\/p>\n

Magnesium and Calcium Removal Fluxes<\/a><\/h3>\n

Magnesium: Aluminum alloys usually contain a small amount of magnesium. In some, magnesium plays an important part in promoting high mechanical properties after heat treatment. In other alloys, magnesium is present only as a permitted impurity within limits, and significant amounts may be detrimental.<\/strong>
\nCalcium: For secondary aluminum alloy makers, metallic silicon contains undesirable calcium, which can lead to porosity and needs to be kept at a very low level.<\/strong><\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

Flux in metallurgy Flux in metallurgy Covering and Drossing Fluxes (low-fluoride, low- and high-temperature, and sodium-free types available) Aluminum is chemically very active. A tough film or skin of aluminum oxide forms quickly on all freshly exposed surfaces, especially in the molten state. Scrap or…<\/p>","protected":false},"author":1,"featured_media":3162,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[52],"tags":[1105,761,763,757,758,756,765,759],"yoast_head":"\nFlux In Metallurgy - AdTech Metallurgical Materials Co.,Ltd.<\/title>\n<meta name=\"description\" content=\"Flux In Metallurgy - Covering and Drossing Fluxes Exothermic Fluxes Degassing Fluxes Sodium Modifying Fluxes Grain Refining Fluxes\" \/>\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.adtechamm.com\/es\/flux-in-metallurgy\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Flux In Metallurgy - AdTech Metallurgical Materials Co.,Ltd.\" \/>\n<meta property=\"og:description\" content=\"Flux In Metallurgy - Covering and Drossing Fluxes Exothermic Fluxes Degassing Fluxes Sodium Modifying Fluxes Grain Refining Fluxes\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.adtechamm.com\/es\/flux-in-metallurgy\/\" \/>\n<meta property=\"og:site_name\" content=\"Adtech China\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/avril.allen.3994\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/profile.php?id=100058838456679\" \/>\n<meta property=\"article:published_time\" content=\"2018-03-20T02:57:43+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-01-15T08:34:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.adtechamm.com\/wp-content\/uploads\/2018\/03\/Flux-Used-In-Metallurgy-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"AdTech\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@AdTech_China\" \/>\n<meta name=\"twitter:site\" content=\"@AdTech_China\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"AdTech\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.adtechamm.com\/flux-in-metallurgy\/\",\"url\":\"https:\/\/www.adtechamm.com\/flux-in-metallurgy\/\",\"name\":\"Flux In Metallurgy - 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