Abstract

This chapter discusses the structure, bonding, rupture behavior, and strength of ceramics. It also discusses the time and temperature effects and role of heterogeneities on ceramics. Ceramics display inorganic crystal structures or, occasionally, glass-like amorphous structures. According to the chemical species involved, the bonds may be ionic, covalent, or metallic. Additional van der Waals bonds also may occur. Processes and properties will depend on the nature of the bonds and their structure. Ionic bonding occurs when one atom gives up one or more electrons that are accepted by one or several other atoms in such a way so that an overall electrical neutrality is maintained. Each atom thus gets a stable, filled electron shell. Metallic oxides and halides have mainly ionic bonding. Covalent bonding occurs when two or more atoms share electrons. Here again, this generally endows each atom with a stable and filled electron shell. Depending on the ceramic type, the shape, and the required characteristics, numerous forming processes can be resorted to. The main ones are die pressing, slip casting, injection molding, and extrusion molding.

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