The table below provides a summary of the main properties of ceramics and glass.
Structure of ceramics ppt.
Factors that determine crystal structure.
Fe ni al called cations and non metallic ions e g.
1 relative sizes of ions formation of stable structures.
Outline of topic 3.
Oxygen anions larger than metal cations.
3 1 fireclay 3 2 silica 3 3 basic refractories 3 4 special refractories 4 abrasives 5 cements 6.
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.
Close packed oxygen in a lattice usually fcc cations fit into interstitial sites among oxygen ions.
Glass ceramics are made of small grains surrounded by a glassy phase and have properties in between those of glass and ceramics.
O n cl called anions bonding will usually have some covalent character but is.
The arrangement of ions and atoms affect the thermal electrical dielectric optical and magnetic properties of ceramics.
Although toughened ceramics are far less tough than metals they represent a vast improvement over conventional ceramics and glass.
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.
Fracture toughness is defined as the stress intensity factor at a critical point where crack propagation becomes rapid.
In a single crystal the atoms.
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.
Amorphous structure means that atoms are not organized according to a well ordered repeating arrangement as in crystals.
Advanced structural ceramics advanced structural ceramics prospects of toughened ceramics.
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.
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