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Blowing Agent

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description about various foaming agents used in metal foam manufacturing
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  BLOWING AGENT FOR METAL FOAM  CONTENTS  Introduction.  Foaming Process.  Hydrides As Blowing Agents.  Carbonates As Blowing Agent.  Decomposition Temperature.  Reactivity With Base Metal.  Performance Enhancement.  References.  INTRODUCTION  A blowing agent can be defined as a material that decomposes under the influence of heat and releases gas which then propels the foaming  process .  The quality of final foam is influenced by several parameters such as composition, size and volume fraction of the blowing agent used.   Different chemicals such as carbonates and metal hydrides fit into the  blowing agent description.  Blowing agents are typically applied when the blown material is in a liquid stage. Generally the foaming agents must undergo thermal decomposition and generate gas pressure in the matrix sufficient to overcome atmospheric pressure and cause foaming.  FOAMING PROCESS During the production of metallic foam as soon as the metal softens, the  blowing agent expands giving rise to small spherical bubbles. During the growth of these bubbles interaction between cells results in change of shape of bubbles from spherical to polygon and thus final shape of  bubble formed is polygon surrounded by liquid layer.    Figure 1.Steps of formation of the metallic foam  

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