{"id":7397,"date":"2020-10-14T07:30:46","date_gmt":"2020-10-14T07:30:46","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=7397"},"modified":"2020-10-14T07:30:46","modified_gmt":"2020-10-14T07:30:46","slug":"aluminium-degassing-unit","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/es\/aluminium-degassing-unit\/","title":{"rendered":"Unidad de desgasificaci\u00f3n de aluminio"},"content":{"rendered":"

Unidad de desgasificaci\u00f3n de aluminio<\/strong> removes impurities from the melt to provide cleaner and better quality metals. It is one of the most common and effective cleaning methods used in foundries.<\/p>\n

There are two main types of impurities found in molten aluminum: dissolved hydrogen and solids<\/p>\n

Non-metallic inclusions. As the metal cools, the dissolved hydrogen escapes from the solution and forms harmful pores. This porosity and non-metallic solid inclusions reduce the strength and adversely affect the final performance of castings made of aluminum.<\/p>\n

\"Desgasificador<\/p>\n

In aluminum, the reaction with water vapor is as follows:<\/strong><\/p>\n

\u00b72 Al + 3 H2 O = Al2 O3 + 3 H2<\/p>\n

A continuaci\u00f3n, el hidr\u00f3geno molecular se disocia en el metal fundido:<\/p>\n

\u00b73 H2 = 6 hours<\/p>\n

Molten aluminum also interacts with oxygen in the atmosphere, so in addition to the oxidation reaction shown in equation (a), the following reactions also occur:<\/p>\n

\u00b74 Al + 3 O2 = 2 Al2 O3<\/p>\n

This reaction results in the formation of oxide scales on the surface of the molten metal during the melting process, and any subsequent transfer of the molten metal.
\nThe oxides produced are trapped in most of the molten material and then transferred to the finished casting.
\nOther non-metallic inclusions, such as carbides, nitrides or borides, can come from sources such as crucible materials or other refractory materials.<\/p>\n

\"Unidad<\/p>\n

Therefore,<\/strong> the Aluminium Degassing Unit must be used to remove dissolved hydrogen and non-metallic inclusions from the molten aluminum before casting to achieve the best quality.
\nThe processes that have been developed for cleaning metals are physical processes that involve the use of inert gas fluxes.
\nThe hydrogen dissolved in the molten material diffuses into the rising bubbles of the flux gas and is transported to the surface of the molten material. This process depends on two main steps:<\/p>\n

The rate at which hydrogen diffuses through the diffusion boundary layer into inert bubbles
\nConcentration of hydrogen in inert bubbles
\nDiffusion is the degassing rate determination stage. Therefore, in order to achieve the best degassing efficiency, the following requirements must be met:<\/p>\n

The bubbles of the inert gas are smaller and the residence time in the molten metal is longer. This ensures a large surface contact area between the inert bubbles and the molten metal, thus ensuring a higher mass transfer coefficient relative to the diffusion layer.<\/p>\n

Contact sales@adtechamm.com to buy Unidad de desgasificaci\u00f3n<\/a>.
\nThe distribution range of inert bubbles on the entire cross section of the molten metal has been very wide
\nThe full movement of the molten material accelerates the transmission of hydrogen to the inert bubbles
\nThe static surface of the molten pool of molten material to avoid the absorption of fresh hydrogen from the reaction with the atmosphere.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminium Degassing Unit removes impurities from the melt to provide cleaner and better quality metals. It is one of the most common and effective cleaning methods used in foundries. There are two main types of impurities found in molten aluminum: dissolved hydrogen and solids Non-metallic…<\/p>","protected":false},"author":1,"featured_media":7398,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[45391,52],"tags":[],"yoast_head":"\nAluminium Degassing Unit | Adtech China -sales@adtechamm.com<\/title>\n<meta name=\"description\" content=\"Aluminium Degassing Unit removes impurities from the melt to provide cleaner and better quality metals. 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