The Fabrication of Materials. Materials Technology by J. G. Tweeddale (Auth.)

By J. G. Tweeddale (Auth.)

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Decanting permits the skimming off of light floating slags leaving behind heavy slags that sink to the bottom of the liquid. Draining permits the preliminary drawing off of heavy slag and the leaving behind of light slag in the bottom of the emptied vessel. Metals can be melted by heat derived from combustion of coal, coke, gas or oil, from electric resistance heating, electric arc heating, 31 or electric induction heating. N o n metallic materials may be melted by similar means except that arc heating and induction heating are likely to be more difficult to apply to them.

Electric filaments). Tungsten carbide is usually made into a solid form by a powder process from tungsten and carbon powder, but if it is material for incorporation into a cemented carbide, it must be broken and crushed into angular granular form. 2 M A T E R I A L S D I F F I C U L T TO M E L T A N D VISCOUS M A T E R I A L Many materials are unsuitable for casting because either (1) the material disintegrates before melting (2) the melting temperature is too high (3) the material is difficult to melt in bulk or (4) it is so viscous when molten that it cannot be made to flow.

A plastomer is a polymeric material with its chains so stiffened by interbonding that although it has some elasticity, it is easily deformed plastically as its chain cross-links break and then reform. The effectiveness of a given molecule, for this kind of use, may be greatly limited by other undesirable properties that it may possess. (d) Chemical solidification by inward diffusion of a suitable gas, or by irradiation, may operate, in appropriate cases, by similar bonding mechanisms to those used in system (a) or (b) or even (c).

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