Experimental Investigation on Silicon Carbide Reinforced Duralumin based MMC Produced by Cold Compacting

Abstract

In the present investigation, an attempt is made to fabricate the Duralumin(DA) based Silicon Carbide (SiC p-6 and 12% wt.) reinforced composite by cold compacting the ball milled powders. The mechanically mixed powders taken into the die cavity are applied with a steady axial load in the range 22-30 T to produce the cylindrical compacts. The compacts are further subjected to sintering by holding it at a constant temperature of 580 0 C in Muffle furnace for 5 h and allowed to cool in the same for 18 h. The hardness of sintered composite is found to have improved as compared to the sintered duralumin compact prepared under similar process conditions. The SEM images showed the uniform distribution of the reinforcements in the matrix and the elemental composition is confirmed by the EDAX spectrum. The sintered specimens were further subjected to age hardening heat treatment. Specimens were soaked at 550 0 C for 2 h followed by water quenching at room temperature. The quenched specimens were artificially aged in the furnace at temperatures of 100, 150, and 200 0 C for various durations of time. The peak hardness obtained because of aging heat treatment is found to be much better than the corresponding sintered compacts. Compacts peak aged at 100 0 C exhibited better tensile strength than the other category of specimens. The composites developed in the present study would be most suitable in the applications requiring high strength and resistance to heat and wear.

Review—Different Ceramic Reinforcements In Aluminium Metal Matrix Composites

“…SiC.-Under abrasive and dry sliding condition it is observed that the improved wear resistance in aluminium based SiC reinforced composites with stir casting method 8,9 authors observed the problem with uniform distribution and formation of the cluster due to density difference, varied exposure timing between the molten Al and SiC particles creates poor wettability and elevated surface tension between them for that S Tzamtzis et al 10 used a rheo casting method instead of directly introducing the reinforcement the author converted the state of liquid, the reinforcement introduced in the form of paste even then the problem of formation of the cluster is reduced but not eliminated, the grain refinement of the reinforcement is not uniform which affects the mechanical properties, other than these manufacturing process in solid-state processing is powder metallurgy process the uniform distribution of grains is observed 11,12 Sajjad Arif et al 13 Studied on morphology and mechanical Aluminium-Silicon Carbide composite prepared by powder metallurgy technique. The study focuses on the worn-out surface morphology and analyzed the wear mechanism, and provides the information that an increase in SiC percentage will improve the wear resistance of the material, maximum wear resistance observed when 10% of SiC is added to composite beyond that wear resistance decreases.…”

A Critical Review on Role of 3D-Printer in Cardiology

“…Despite its early stages of development, several papers have already been published, explaining the advantages of this sector. (41) (62). Clinical treatment is simplified by 3D printing, and using these models might result in the creation of new tools and procedures (7) (64).…”