![\"Al\u00fcminyum](\"http:\/\/www.adtechamm.com\/wp-content\/uploads\/2017\/09\/Online-Degassing-Unit-2-2.jpg\")
<\/p>\nThe Aluminum Degassing 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
Geleneksel hidrojen gaz giderme sistemleri, metalin i\u00e7inden \u00f6zel gazlar\u0131 (klor, freon veya SF6) ge\u00e7irerek, metal-gaz aray\u00fcz\u00fc \u00fczerinden hidrojen transferini h\u0131zland\u0131rmak ve b\u00fcy\u00fck kabarc\u0131klar olu\u015fturmak amac\u0131yla kullan\u0131l\u0131rd\u0131. Nemli g\u00fcnlerde hidrojen gideriminde pratik bir s\u0131n\u0131r vard\u0131; \u00e7\u00fcnk\u00fc b\u00fcy\u00fck kabarc\u0131klar y\u00fczeyi k\u0131rd\u0131k\u00e7a metalin y\u00fczey alan\u0131 art\u0131yordu ve bu da nemli atmosferden daha fazla hidrojen emilmesine neden oluyordu.<\/p>\n
<\/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
D\u00f6ner gaz giderme, metale maruz kalan bir gaz kabarc\u0131\u011f\u0131n\u0131n y\u00fczey alan\u0131n\u0131 art\u0131rma prensibiyle \u00e7al\u0131\u015f\u0131r. Daha geni\u015f y\u00fczey alan\u0131, metalden inert gaza olan transfer h\u0131z\u0131n\u0131 art\u0131r\u0131r. Belirli bir gaz hacmi i\u00e7in kabarc\u0131k boyutu ne kadar k\u00fc\u00e7\u00fckse, y\u00fczey alan\u0131 o kadar b\u00fcy\u00fck olur. \u00d6rne\u011fin, 1 in\u00e7 \u00e7ap\u0131nda bir gaz kabarc\u0131\u011f\u0131n\u0131n y\u00fczey alan\u0131 6 in\u00e7 karedir. Ayn\u0131 kabarc\u0131k 1\/16 in\u00e7 \u00e7ap\u0131nda kabarc\u0131klara b\u00f6l\u00fcn\u00fcrse, y\u00fczey alan\u0131 96 in\u00e7 kareye \u00e7\u0131kar. Ba\u015fka bir deyi\u015fle, ayn\u0131 hacimde gaz kullan\u0131l\u0131rsa ve kabarc\u0131klar\u0131n \u00e7ap\u0131 orijinal \u00e7ap\u0131n 1\/16\u201ds\u0131na indirilirse, toplam y\u00fczey alan\u0131 16 kat artar. Daha k\u00fc\u00e7\u00fck kabarc\u0131klar eriyik y\u00fczeyini daha az bozar ve nemli ortamlardan ek hidrojen al\u0131m\u0131n\u0131 azalt\u0131r.<\/p>\n
Aluminum Degassing is recommended for dry nitrogen or argon. Compatibility with specialty gases cannot be guaranteed. All parts of the unit exposed to gas except for the graphite lance are either stainless steel or Buna-N (seals). A four minute degassing time for a 400 pound crucible is common when nitrogen gas is used. There 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>","protected":false},"excerpt":{"rendered":"
The Aluminum Degassing 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…<\/p>","protected":false},"author":1,"featured_media":2687,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[52],"tags":[],"yoast_head":"\n