{"id":4741,"date":"2019-04-19T03:16:27","date_gmt":"2019-04-19T03:16:27","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=4741"},"modified":"2019-06-03T07:30:53","modified_gmt":"2019-06-03T07:30:53","slug":"aluminum-degassing-units","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/tr\/aluminum-degassing-units\/","title":{"rendered":"Al\u00fcminyum Gaz Giderme \u00dcniteleri"},"content":{"rendered":"

Al\u00fcminyum Gaz Giderme \u00dcniteleri<\/strong><\/p>\n

Aluminum Degassing Units works on the principle of increasing the surface area of an insert gas exposed to the metal.
\nThe larger surface area increases the rate of transfer from metal to the inert gas.
\nThe smaller the bubble size for a given volume of gas, the greater is the surface area.
\nFor example, a 1\u201d diameter bubble of gas has a surface area of 6 square inches.
\nIf the same bubble is divided into 1\/16\u201d diameter bubbles, the surface area is increased to 96 square inches.
\nIn other words, if the same volume of gas is used and the diameter of the bubbles are reduced to 1\/16th the original diameter, the total surface area is increased by a factor of 16.
\nThe smaller bubbles disturb the surface of the melt less reducing additional hydrogen pickup from humid atmospheres.<\/p>\n

\"Al\u00fcminyum
\nAluminum Degassing Units is recommended for dry nitrogen or argon. Compatibility with specialty gases cannot be guaranteed.
\nAll parts of the unit exposed to gas except for the graphite lance are either stainless steel or Buna-N (seals).
\nA four minute degassing time for a 400 pound crucible is common when nitrogen gas is used.
\nThere is no practical reason to use expensive specialty gases (costing up to $500 per bottle) when a $20 bottle of nitrogen will do the same job. Also, no toxic emissions are produced from nitrogen gas.<\/p>\n

Aluminum Degassing Units is based on the principle that dissolved hydrogen gas will move from an area of high concentration (in the melt) to an area of low concentration (in the inert gas). Hydrogen gas disperses in molten metal as it would if it were released in any confined space. It will maintain a constant concentration throughout the melt. Hydrogen gas can migrate in liquid metal almost as fast as it can in air. Therefore, it is unnecessary to bring every ounce of metal in contact with the inert gas. The efficiency of aluminum degassing is determined by two factors, the transfer rate across the metal\/gas interface and the total surface area available for transfer.<\/p>\n

Traditional hydrogen Aluminum Gaz Giderme \u00dcnitesi<\/a>s bubbled specialty gases (Chlorine, Freon, or SF6) through the metal to speed the hydrogen transfer across the metal gas interface into large bubbles. There was a practical limit to hydrogen removal on humid days because as the large bubbles would break the surface, an increased surface area of metal was created which then absorbed more hydrogen from the humid atmosphere.<\/p>\n

Ba\u015flang\u0131\u00e7ta klor tercih edilen gazd\u0131; ancak tehlikeli yap\u0131s\u0131 nedeniyle \u00e7o\u011fu d\u00f6k\u00fcmhane ba\u015fka gazlara ge\u00e7i\u015f yapt\u0131. Bununla birlikte, bir\u00e7ok d\u00f6k\u00fcmhane, kullan\u0131lan herhangi bir \u00f6zel gaz\u0131n par\u00e7alanmas\u0131yla ortaya \u00e7\u0131kan tehlikeli maddeleri dikkate almam\u0131\u015ft\u0131r.<\/p>\n

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