Structure Of Metal And Ceramics

The metal is used as a binder for an oxide boride or carbide.

Structure of metal and ceramics. Ceramics are by definition natural or synthetic inorganic non metallic polycrystalline materials. The bonding of atoms together is much stronger in covalent and ionic bonding than in metallic. Sometimes even monocrystalline materials such as diamond and sapphire are erroneously included under the term ceramics. Therefore the structure the metallic atoms the structure of the nonmetallic atoms and the balance of charges produced by the valence electrons must be considered.

The properties of ceramics however also depend on their microstructure. Generally the metallic elements used are nickel molybdenum and cobalt. The two most common chemical bonds for ceramic materials are covalent and ionic. Polycrystalline materials are formed by multiple crystal grains joined together during the production process whereas monocrystalline materials are grown as one three dimensional crystal.

A cermet is a composite material composed of ceramic and metal materials. Bonding ranges from ionic to covalent. Usually they are metal oxides that is compounds of metallic elements and oxygen but many ceramics especially advanced ceramics are compounds of metallic elements and carbon nitrogen or sulfur. Charge balances and relative ion size plays key roles in determining structure and properties.

Depending on the physical structure of the material cermets can also be metal matrix. The atoms in ceramic materials are held together by a chemical bond. Most ceramics usually contain both metallic and nonmetallic elements with ionic or covalent bonds. Ceramic crystal structures generally more complex than metals because they are composed of at least two elements or more.