Effect of Al content on chemical corrosion resistance of Al/SiC composites

Al/SiC composites with different Al contents were prepared by high-energy ball milling with Al powder and SiC powder as raw materials at a temperature of 1800 degrees C, a pressure of 50 MPa, and heat preservation for 5 min. The microstructures and phase compositions of the Al/SiC composites were observed using scanning electron mi-croscopy and X-ray diffraction. The results showed that the Al/SiC composites prepared by adding 10 vol% aluminum had the best properties: the strength was 310 MPa, the apparent porosity was 6.50%, and the density was 2.9192 g/cm3. Furthermore, the corrosion rate of the Al/SiC composites gradually decreased with increasing corrosion time when the Al/SiC composites were placed in a 3.5 wt% NaCl solution at room temperature. However, the corrosion rate differed for varying Al contents. The experimental results showed that the Al/SiC composites with 10 vol% Al have the best properties, including the smallest porosity, the largest density, and the highest corrosion resistance.

Automated summary

Al/SiC composites with different Al contents were prepared by high-energy ball milling. The results showed that the Al/SiC composites with 10 vol% Al had the best properties, including higher strength, lower porosity, and higher density. The corrosion resistance of the composites also improved with increasing corrosion time.