Crucible Furnace Research Paper

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INTRODUCTION Casting process is one of the earliest metal shaping processes. It basically involves pouring molten metal into a refractory mould cavity and allowing it to solidify. The mould cavity has the dimensions equal to that of the desired shape. The solidified object is then taken out from the mould and this object is known as the casting. Many factors such as the type of material used for casting, the mould material, the shape required, type of melting required, etc have to be taken into consideration beforehand. We here are going to discuss the melting process which uses crucible furnaces. CRUCIBLES A crucible is a container that can withstand the very high temperature necessary to melt glass, different types of metals, etc.…show more content…
It is very important not to let surface of the refractory dry out or it may skin over and trap moisture inside. When this liner is fired it is very likely to crack. Depending upon our needs there are different types of crucible furnaces. They are classified according to the source of heat they use. Some of them are are discussed below in detail: • CHARCOAL CRUCIBLE FURNACE Charcoal fired crucible furnaces have been used for thousands of years and run on similar principles as modern furnaces. Essentially you have a crucible which is surrounded by fuel (charcoal, coal or coke) and accelerated by the addition of forced air. Two of the biggest changes in technology were making the furnace cylindrical and having the forced air come in from the bottom. This furnace is used for melting non ferrous metals in small quantity. This furnace is placed above the floor level. The crucible is placed in the heating chamber. The heating chamber is lined with refractories. Coke is used as fuel. Forced draft is used. A blower is used for supply of air. Working:- Charcoal fired furnaces are one of the easiest furnaces to build and run on a small scale (under 150 pounds of

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