Squeeze casting

Подпись: pH = 9 - t = 30 min
Squeeze casting

The squeeze casting is likely one of the most usual manufacturing processes for elaboration of metal matrix composites (MMC). This process consists in the production of rigid porous structures with reinforcement, in our cases carbon fibre structure, that are further infiltrated by metal molten under pressure (fig. 8). The molten copper is poured (1180°C) into the bottom half of the pre-heated die (close to 1000°C).

Fig. 6. Evolution of the coating behaviour with the pH of the solution

Подпись: 4 pmПодпись: mL H 2O / 50 mg VGCF / mLHCHO

Squeeze casting Squeeze casting Подпись: b) 200 ml of water Squeeze casting

Squeeze castingSqueeze castingSqueeze casting4 pm

d) Подпись: f) 200 ml of water100 ml of water

Подпись: Infiltration of molten copper Fig. 8. Squeeze casting process

Fig. 7. Evolution of the coating behaviour with the water concentration

During the infiltration step, the carbon fibre structure is placed in the die. The main inconvenient of this technique is to keep steady the metal liquid during the infiltration step
because of the high melting point of copper (1083°C). Other inconvenient is linked to low wettability of copper with carbon, which involves the high infiltration pressure. This low wettability can lead to carbon fibre agglomerates and the presence of micro porosity in composites. Then, the squeeze casting is not the best process route for the elaboration of Cu/C composites.