{"id":2841,"date":"2017-11-30T05:35:19","date_gmt":"2017-11-30T05:35:19","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=2841"},"modified":"2017-12-07T05:10:10","modified_gmt":"2017-12-07T05:10:10","slug":"aluminum-fluxes","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/tr\/aluminum-fluxes\/","title":{"rendered":"Al\u00fcminyum Ergitici Maddeler"},"content":{"rendered":"

Al\u00fcminyum Ergitici Maddeler<\/h1>\n

Al\u00fcminyum Ergitici Maddeler<\/p>\n

Gaz Giderici Ak\u0131\u015fkanlar<\/a>
\nHydrogen, 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 solution and forms bubbles, from pinhole size to much larger sizes. 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.<\/p>\n

Ekzotermik Ak\u0131lar
\nFluxes of this type are applied to dross for the purpose of releasing metal trapped in the dross and thus reducing melting losses.<\/p>\n

F\u0131r\u0131n Duvar\u0131 Temizleme Ak\u0131\u015fkanlar\u0131
\nOxide 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 which is very difficult to remove. Wall cleaning fluxes soften the buildup and make it easier to scrape away.<\/p>\n

\"Al\u00fcminyum<\/p>\n

Covering and Drossing Fluxes
\n(d\u00fc\u015f\u00fck flor\u00fcrl\u00fc, d\u00fc\u015f\u00fck ve y\u00fcksek s\u0131cakl\u0131kta kullan\u0131labilen ve sodyum i\u00e7ermeyen \u00e7e\u015fitleri mevcuttur)<\/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. If these oxides are included in the cast product, they 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.<\/p>\n

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

Sodyum \u0130\u00e7eren Ak\u0131 Modifiye Ediciler
\nFor hypoeutectic alloys containing silicon, 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.<\/p>\n

Tah\u0131l \u0130ncelme Ak\u0131\u015fkanlar\u0131
\nGrain size in aluminum alloys refers to 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.<\/p>\n

Tah\u0131l ar\u0131tman\u0131n avantajlar\u0131 \u015funlard\u0131r:
\nG\u00f6zeneklili\u011fin da\u011f\u0131l\u0131m\u0131.
\nS\u0131cak g\u00f6zya\u015flar\u0131n\u0131n \u00f6nlenmesi.
\nImproved pressure tightness through prevention of blowholes.
\nTitanyum, bor ve zirkonyum, yayg\u0131n olarak kullan\u0131lan tane incelticilerdir. Silikonun al\u00fcminyumdan \u00f6nce \u00e7\u00f6kelme g\u00f6sterdi\u011fi hipereutektik ala\u015f\u0131mlarda, tane inceltme amac\u0131yla fosfor kullan\u0131l\u0131r.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum Fluxes Aluminum Fluxes Degassing Fluxes 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 solution…<\/p>","protected":false},"author":1,"featured_media":2638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[52],"tags":[],"yoast_head":"\nAluminum Fluxes |AdTech Metallurgical Materials Co.,Ltd.<\/title>\n<meta name=\"description\" content=\"Aluminum Fluxes Degassing Fluxes Exothermic Fluxes Furnace Wall Cleaning Fluxes Covering and Drossing 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\/tr\/aluminum-fluxes\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminum Fluxes |AdTech Metallurgical Materials Co.,Ltd.\" \/>\n<meta property=\"og:description\" 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