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Metal and Non-Metal

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WHAT IS METAL?

A metal is a chemical element that is a good conductor of both electricity and heat. Metals are malleable and ductile and have lustrous appearance. They have moderate to high physical constants and high tensile strength. Metals are further divided into two main groups - ferrous and non ferrous metals.

TYPES OF METAL

• FERROUS METAL

These are metals which contain iron. They may have small amounts of other metals or other elements added, to give the required properties. All ferrous metals are magnetic and give little resistance to corrosion.

Example: Wild steel, Carbon steel, Cast iron, Wrought iron, Stainless steel

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Stainless …show more content…

It therefore includes a correspondingly wide range of skills, processes, and tools. These are several process of working with metal:

CASTING

Casting is a manufacturing process by which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. Casting is most often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods. Example is sand casting.

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|Investment casting is sometimes called lost wax process where a ceramic mold is used to form the desired part. To fabricate the ceramic |
|mold, a metal mold is made by machining or casting. Wax is then injected into the mold and is removed after it cools. The wax, which |
|resembles the desired part, is then coated with ceramic slurry in several layers. The completed ceramic slurry is placed in a furnace to |
|harden and the wax removed by melting and evaporation. The desired part is made by filling the mold cavity with molten metal. After |
|solidification, the mold is destroyed and the part removed. Investment casting is capable of surface finishes such that machining is not |
|generally

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