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Metal Casting Technologies : September 2006
60 www.metals.rala.com.au TECHNICAL FEATURE The use of mould coating improved the fluidity of molten metal by lowering the heat transfer from the metal and thus increasing the length of flow of metal. Fluidity was less when no coating was provided. Carbon coating provided maximum value. When the metal is melted at higher temperature fluidity is increased. We can conclude that without going for higher temperature we can attain increase in fluidity by mould coats. From the results of Al/SiC it was found that tool wear increased with increasing cutting speed. Wear was maximum at cutting speed of 90 m/min. From the results it shows that the impact behaviour of base matrix is more than the MMC. The addition of SiC particles to the matrix made the material brittle and reduced its impact properties. With lower temperature the impact energy was reduced for both the materials. The base matrix showed more spiral fluidity length compared to Al/SiC material. Al/SiC showed reduced spiral fluidity due to increased viscosity. It was observed that the composite showed lower volume loss due to the addition of ceramic particles. The wear rate decreases with the addition of ceramic particles. SiC reinforcements caused an improvement in wear resistance. From the optical micrograph of Al/SiC (top section) it can be seen there is good distribution of particles in the matrix. The magnified view shows clusters of unwetted particles (middle section). The cast foam was sectioned to observe the inner porous structure. It was seen that relatively uniform pores were produced. In some areas pores are non uniform in size. The RD values are not uniform. If TiH2 % had been increased then foam would have been more porous. Also there was premature release of hydrogen gas with the addition of TiH2. ● Particulars RD Sample a 0.59 Sample b 0.44 Sample c 0.64 Sample d 0.42 Sample e 0.38 Amit M Joshi Dept. of Metallurgical Engineering & Materials Science Indian Institute of Technology -- Bombay, India Email: email@example.com Amit Joshi is a mechanical engineer. His interests are in the field of liquid metal processing, metal matrix composites & manufacturing engineering. Molten metal is dangerous and it can cause accidents if it is handled carelessly. Use goggles and face shields against flying particles, metal splashes and radiation. Gloves, shoes and proper clothes should be used when dealing with molten metal.