Silicon nitride and graphite are added as a reinforcement material to aluminium alloy ,I wonder whether this combination will work out.
Yes, you can use. But ... what you would like to check and what processing you will use to produce the composite?
Dear Praveen,
Silicon Nitride could be very interesting for Aluminium matrix composites. You may use a complete powder metallurgy route, but you probably will incorporate a non neglectable ammount of aluminium oxide from the powders of aluminium alloys. The other very interesting processing route is to start from a pre-form of silicon nitride fibers (or wiskers) and then infiltrate the aluminium alloy under vacuum, to degas the preform and to avoid oxidation of the aluminium alloy melt. This will work if the procedure is clean enough.
In what concerns the grafite, I do not believe that it will work because aluminium alloys usually do not wet the grafite and no good enough bonding will be produced. However, you may eventually use carbon nanotubes (single or multi walls) to reinforce Aluminium alloys. In a hybrid composite, CNT will have a tendence to accumulate at the grain boundaries of the Aluminium alloy, producing a reinforcement that will improve the creep behaviour.
Please go through this paper. This may help you.
http://real.mtak.hu/11159/1/ECB_Hybrid_3_247.pdf
This works well even if you are using simple unidirectional compress and pressureless sintering in the furnace. I did it as small project during my MS.
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