Structure Of Ceramics Ppt

3 1 fireclay 3 2 silica 3 3 basic refractories 3 4 special refractories 4 abrasives 5 cements 6.

Structure of ceramics ppt.

Outline of topic 3. Factors that determine crystal structure. Close packed oxygen in a lattice usually fcc cations fit into interstitial sites among oxygen ions. O n cl called anions bonding will usually have some covalent character but is.

Structure of metals ceramics ppt. Although toughened ceramics are far less tough than metals they represent a vast improvement over conventional ceramics and glass. Properties of ceramics classification of ceramics ceramic raw material fabricating and processing of ceramic application of ceramics 1 glasses 2 clay products 2 1 structural clay product 2 2 whitewares 3 refractories. The arrangement of ions and atoms affect the thermal electrical dielectric optical and magnetic properties of ceramics.

Glass ceramics are made of small grains surrounded by a glassy phase and have properties in between those of glass and ceramics. 1 relative sizes of ions formation of stable structures. Chapter 3 structures of metals ceramics the properties of a material depends on the arrangement of atoms within the solid. In a single crystal the atoms.

2 ceramic structures continue factors influence crystal structure magnitude of electrical charge of ions relative size of ions non metal metal ions rc ra 1 äcations must be next to anions maximize of nearest neighbors that are anions ästable structure anions and cations must contact each other äthe of anions depends on ratio of rc ra. A polycrystalline structure through heat treatment proportion of crystalline phase range 90 to 98 remainder being unconverted vitreous material grain size usually between 0 1 1 0 m 4 and 40 in significantly smaller than the grain size of conventional ceramics this fine crystal structure makes glass ceramics. Structure of ceramics all structures consist of one of the 14 well known bravais lattices plus a collection of atoms the basis that decorates each lattice point. Fracture toughness is defined as the stress intensity factor at a critical point where crack propagation becomes rapid.

Fe ni al called cations and non metallic ions e g. Ceramic crystal structure broader range on chemical composition than metals with more complicated structures contains at least 2 and often 3 or more atoms usually compounds between metallic ions e g. Oxygen anions larger than metal cations. The table below provides a summary of the main properties of ceramics and glass.