I understand there is a high volume of waste for the production of MMC's this mainly comes from the high porosity or agglomeration of particles. But I would like to know the exact mechanisms which contribute to these issues.
Porosity and agglomeration, primarily contribute to the wastage of the composites. Liquid metallurgy routes fall under this category. However, expensive processes such as solid metallurgy (powder metallurgy), could be used for mass production of these metal matrix composites in medium production rates. The principal factor affecting the problem is the wettability of the reinforcements with the liquid alloys (In case of liquid metallurgy processes).
the challenge is using a method which is capable to achieve a homogeneous particle distribution in the melt. But the useful method is not always economically feasible in comparison with the product price and demand.
The main cause of agglomeration of reinforcing particles is the low wettability of the reinforcement by the liquid matrix , which occurs when the composite is prepared by melting matrix route. Different techniques were proposed to enhance wetting for each case. Porosity occurs due to many reasons, one of them is entrapped air due to stirring and low fluidity due to agglomeration@
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