Machinability of Aluminum Metal Matrix Composite Reinforced with In-Situ Ceramic Composite Developed from Mines Waste Colliery Shale

Abstract

In the present investigation, aluminum metal-matrix composite (AMC) is developed using a novel in-situ ceramic composite, converted from waste colliery shale (CS) material by heat treating in a plasma reactor under neutral atmosphere. The developed AMC has shown improved mechanical properties as compared to Al-Al₂O₃ and Al-Al₂O₃-SiC composites. The present study encompasses the machinability of the developed AMC as well as the other two composites. The variables like radial force, feed force, cutting force, power consumption, and surface roughness are taken as index for machinability. The developed AMC has shown better machinability than the other two composites. The presence of free carbon as graphite in the developed AMC has helped to improve the machinabilty. The machinability results have been corroborated by surface roughness measurement on the machined surfaces of the samples.

Keywords:

• Colliery-shale
• Composite
• Cutting forces
• Machinability
• Surface roughness

ACKNOWLEDGMENTS

The authors acknowledged to M/s NALCO, Bhubaneswar, India, for providing Al and necessary funding. CSIR-IMMT and CSIR-NML are gratefully acknowledged for their help. The authors owe to the chairman and secretary of GIET for permitting to carry out the research and permission to publish the work.