Sintering is a method used to densify powder material through atomic diffusion. Atomic diffusion occurs in materials with high rate at elevated temperatures. In most of the sintering processes, the powdered material is held in a mold or it is held in shape by high pressure compressing of the mixture of base material with a temporary binder and then heated to a temperature below the melting point. The atoms in the powder particles diffuse across the boundaries of the particles, fusing the particles together and creating one solid piece. Because the sintering temperature does not have to reach the melting point of the material, sintering is often chosen as the shaping and manufacturing process for materials with extremely high melting points such as Alumina, Boron Carbide, Boron Nitride, Tungsten and Molybdenum. Sintering is traditionally used to sinter ceramic objects; but finds applications in powder metallurgy also. A relatively newer but vastly used science of sintering metal powders to form various parts is known as Powder-Metallurgy.