Performance of graphic aluminium particulate composite materials

Spark plasma sintering of graphite–aluminum powder reinforced with SiC/Si particles

“…Despite all the interesting properties of graphite which make it useful in a wide range of engineering applications, it is however very difficult to consolidate [5]. Thus there has been a proposal for a graphite-particle dispersed composite produced by compacting graphite particles coated with a high thermal conductivity metal such as copper, silver or aluminum [3,[10][11][12][13][14][15]. However, due to the problem of having good wettability between graphite and metal in the production of dense, high thermal conductivity composites, different efforts have been adopted to improve wettability and adhesion of graphite with the metal [16][17][18].…”

Effect of Particulate Reinforcements on the Mechanical Properties of Al6061-WC and Al6061-Gr MMCs

“…The graphite in these composites presumably imparts improved tribological properties to the composites through the formation of a graphite-rich film on the tribo-surface which provides solid lubrication. Journal bearings made of graphite particle dispersed composites perform much better than conventional bearing alloys [8]. Graphite particles of size ranging from 50 to 200 µm yield the best results [9].…”

Comparison of the Mechanical Properties of AL6061/Albite and AL6061/Graphite Metal Matrix Composites

“…There is a good reason for this phenomenon, though, since graphite, being a soft dispersoid, does not contribute positively to the hardness of the composite. Instead, as mentioned above in the case of ductility, the graphite added, being an effective solid lubricant [22,[8][9][10][11], eases the movement of grains along the slip planes, rendering the material more easily deformable under the indenter of the hardness tester. K.H.W Seah et al, [23] have reported a reduction in hardness from 107 BHN to 77 BHN (about 28% differences) on addition of similar weight percentages of graphite to ZA-27 (Zinc Aluminium) alloy.…”

“…In fact, as the graphite content is increased from 0% to 4% the ductility increases by about 60%. This considerable increase in ductility is due to the graphite additions, being an effective solid lubricant [22,[8][9][10][11], eases the movement of grains along the slip planes. The effect of graphite is expected to be mechanical in nature since the particles are unreactive with the matrix phase [19].…”

“…The graphite in these composites presumably imparts improved tribological properties to the composites through the formation of a graphite-rich film on the tribo-surface which provides solid lubrication. Journal bearings made of graphite particle dispersed composites perform much better than conventional bearing alloys [8].…”