Degassing effect of preheated inert gas on aluminum

In order to improve the degassing effect of the inert gas on aluminum alloy melt and avoid the environment pollution,a new kind of degassing way has been put forward.A simple inert gas preheating unit has been designed.Using the inert gas preheating unit can increase the inert gas bubbles' temperature in the aluminum melt.The degassing result shows that the preheated inert gas can produce tiny and dispersive thermal bubbles after blowing into the aluminum melt and the thermal bubbles do not grow up quickly.More over,the thermal bubbles rise out of the aluminum melt slowly,so the degassing time is elongated.The hydrogen content can be as low as 0.15 mL/100g Al after the aluminum melt being held for 20 min.The preheated inert gas gets better effects than that of the traditional degassing way.And it is an effective environmental protective degassing technology.