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| Alloy Preparation The most common way to prepare alloys is to melt the constituent metals together. If the melting points of the metals differ widely, or if one is very reactive, it may be convenient to first prepare a master alloy, portions of which are then melted with the remaining metals. Depending upon the nature of the elements to be alloyed, the melting process may be carried out in furnaces fired by gas, coke, or oil. Electrical heating, by resistance, induction, or arc melting methods, is also used. A few alloys are prepared directly by the process in which the metals are extracted from their ores. For example, pig iron is prepared by the reduction of iron ore in the blast furnace. Steels are prepared by further purification (reduction) of pig iron. Alloys can also be prepared by mixing finely powdered portions of the constitutent metals, compacting the mixture under high pressure, and removing the impurities.
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| Curriculum design: David L. Heiserman Publisher: SweetHaven Publishing Services |
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