Affiliation:
1. MITE
2. Rajiv Gandhi Institute of Technology
Abstract
History is often marked by the materials and technology that reflect human capability and understanding. Many a times scales begins with the stone age, which led to the bronze, iron, steel, aluminium and alloy ages as improvements in refining, smelting took place. Science made all these possible to move towards finding more advanced materials.Therefore in the present research work, an investigation has been carried out to fabricate and evaluate the microstructure, strength, micro hardness of chilled composites consisting of nickel matrix and fused SiO2particles as the reinforcement (size 40-150 μm) in the matrix. The reinforcement being added ranges from 3 to 9 wt. % in steps of 3%. The resulting composites cast in moulds containing metallic chill blocks (MS, SiC & Cu) were tested for their microstructure and mechanical properties. The main objective of the present research is to obtain fine grain Ni/SiO2chilled sound composite having very good mechanical properties. A detail of melting and composite preparation is described elsewhere by number of researchers. After melting the matrix material in an induction furnace at around 1600 °C in an inert atmosphere, coated fused SiO2particles preheated to 500 °C were introduced evenly into the molten metal alloy by means of special feeding attachments. The moulds for the plate type of castings 150*20*20 mm (American Foundrymen Society standard) were prepared using silica sand with 5% bentonite as binder and 5% moisture and finally they were dried in an air furnace at a temperature of 1580 °C, which was cooled from one end by a chill block set in the mould. After solidification the specimens of chill end were tested for various mechanical and microstructural studies. Keywords: Metal matrix composite, Mechanical properties, Nickel alloy, Fused silica, Chills.
Publisher
Trans Tech Publications, Ltd.
Reference12 articles.
1. Joel Hemanth, Cryo effect during solidification on the tribological of Aluminium- alloy/glass (SiO2) MMC. Journal of composite materials, vol. 43, No. 06/(2009).
2. Pradeep K. Rohatgi, Metal matrix composites, Defense Science Journal, vol 43, No: 4, Oct 1993, pp.323-349.
3. CAI Bin, TAN Ye-fa, TU Yi-qiang, WANG Xiao-long, TAN Hua, Tribological properties of Ni-base alloy composite coating modified by both graphite & tiC particles, Science Direct-2426-2432, (2011).
4. Meenu Srivastava, A Srinivasan, VK William Grips Influence of Zirconica incorporation on the mechanical & chemical properties of Ni-Co alloys, American Journal of material science, 2011, 113-122.
5. XUE Mao-quan, Tribological behavior of Ni-Cr based composite at high temperature, Transaction of nonferrous metals society of China 17(2007) s570-s574.