Hi, I am using Graphene Nano Platelets as a reinforcement & it has been found that at higher wt % such as 4 is reducing the hardness I don't understand why? ca anyone explain? I have opted powder metallurgy route and my matrix element is Aluminium.
Too much GNP will result in agglomeration. If the GNP can't be well dispersed in the matrix, it may not contribute to your strength. On the other hands, agglomeration of GNP may lead to discontinuity of your matrix and lower the density of your sample, which both impair the mechanical properties.
Thanx Bin Zhao sir, but I am mixing it thoroughly with a powder mixer at a very high amplitude for 30 mins and hot pressing at 500 centigrade but after few days the pallet is converting into powder itself. definitely I will do the SEM studies to see whether it is agglomerating or not? thank you so much for sharing your suggestions.
@ankit sharma please refer my articles which are in the area of powder metallury. The reason for decrease in hardness is because of their soft nature. Graphite/ graphene has good wear and corrosion resistance properties but the hardness reduces due to porosity. There is no way a pellet after sintering becomes powder again. It might break during sintering process due to the imperfections or cracks formed during compaction process. Please check your die for smoothness.
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