Disadvantages Of Silicon Carbide

CHAPTER 1 INTRODUCTION
Composites are the combination of two or more constituent material with significantly different physical and chemical properties with characteristics different from individual components. They commonly consist of a continuous phase called matrix and discontinuous phase in the form of fibers, whiskers, or particles called as reinforcement. Due to their characteristics of behavior with their high strength to weight ratio, Composite materials are gaining wide spread acceptance. Metal Matrix Composites (MMCs) are materials with metals as the base and distinct (Matrix) phase and typically the ceramic phases added as reinforcements to improve the mechanical properties. Excellent mechanical performance,

 Due to the exclusive properties and also ability to be cast to final shape of Silicon Carbide, all over the coal industry from mining to power plants, cost-effective grade is extensively used as a workhorse.
 SiC is moreover used in progress of molten metal pump components, graphite protection liners, thermocouple protection tubes, crucibles, heater tubes.
 Mechanical properties for instance hardness, impact strength, tensile strength, wear resistance etc., are considerably improved by reinforcement of silicon carbide to an alloy.
 The reinforcement of SiC to any alloy is equipped through Stir casting technique and so it doesn’t requires more progressive techniques for reinforcement.

3.2

Preheat the die using muffle furnace in order to remove the moisture content, and the chilling effects reduced.
4. Once the A356.1 Aluminium alloy melts (Fig 4.2(c)), degassing tablets are added into the crucible in order to remove the gases and it facilitates slag removal (Fig 4.2(d)).
5. Stirring set up is brought near the furnace and the stirrer is dipped in to the molten metal and the speed of stirring is maintained at 100rpm.
6. Silicon carbide particles are slowly added in to the molten metal based on the weight percentages after started stirring. As the impeller rotates (Fig 4.2(e)), it generates a vortex which draws the reinforcement particles from the surface in to the melt. For duration about 15-20 min.
7. Once the stirring process is completed, the molten metal that is reinforced poured into the die as shown in Fig 4.2(f) and allowed to solidify for about 2 hours, as shown in Fig 4.2(g).
8. Obtain reinforced A356.1 Aluminium alloy with different Wt. % of 0, 5.0, 10.0, 15.0 SiC (as shown in Fig 4.3), above steps are to be carried out respectively.
9. Casted components then machined as for ASTM standard. Machined cast components are shown in Fig 4.4(a) &