Nowadays the researcher aims to Utilization of Waste Materials in Metal Matrix Composite (MMC’S. but what are the drawbacks of the addition of waste material with (MMCs) composite?
Waste material may be mixture of different material composition. All materials in the waste are beneficial then it is good but if any one material is detrimental then composite performance is degraded. Variable composition of waste material also make it difficult to control properties. Repeatability of experimental results will be effected. Nonetheless, for non critical applications waste material composites are economical alternative.
Most of the waste particulates (Rice Husk Ash, Fly Ash, Bamboo Ash etc.) used to reinforce metal matrix composites contain SiO2 in major quantity in their composition. The properties of the composite will fall short of conventionally used SiC and Al2O3 for a same range of size distribution and volume fraction. Secondly the tendency for interfacial reaction is high if processed via casting routes. Thirdly, their density is far less than aluminum and in some cases less than magnesium. This causes rejection from the melt or a tendency to easily float over the molten metal. Fourthly, the wettability of all waste particulates is so poor and additional arrangements are required to mix with molten metal. Finally, the composition of waste particulates varies across the globe and highly dependent on the place of collection. This makes it difficult to create a reference data for the performance of composites.
The waste material(coal fly ash) produced by the thermal power plants is a significant reinforcement material being used in the production of aluminium metal matrix composites both at laboratory and commercial level. So far the drawbacks of using coal fly ash have not been reported.But one challenge which we are facing is the lack of data availability in respect of its mechanical properties suck as modulus of elasticity,yield strength and compressive /tensile strengths of the cosl fly ash.Since these properties are required for simulation purposes.
Isaac Dinaharan
can you please elaborate tendency of interfacial reaction
In many cases the incorporation of waste particles in metal matrix worsening the mechanical properties .
Dear Ziyauddin Seikh , Since you are talking about the waste materials (please specify category), it might have combination of the elements which will definitely affect the chemistry of base alloy and affect adversely if exceeds the limits. Contrary, it may contribute towards improvement; again depending on the amount, chemistry, and properties of waste materials.
In some cases, it's very tough to separate unwanted foreign particles which added in waste reinforcements.
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