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Different Types of Ceramic (Technical Ceramics (Properties (High Melting…
Different Types of Ceramic
Technical Ceramics
mostly crystalline & bonding could be ionic , covalent or mixed ionic & covalent
covalent bond is stronger & directional, thus
ceramics have high melting point
most of modern technical ceramics such as alumina are produced via powder route & wet processing vs melting & casting
Properties
High Melting point
Strength at high temperature
Hardness
Wear resistance
Mechanical stability
Low density
Transparency
Resistance to corrosion
Glasses
have a more disordered arrangment of atoms but not completely random
Processing:
melting
the
raw material
& s
haping of molten glass
by
blow molding
,
spin casting
, or
pressing
Viscosity
of the glass is an
important parameter
& is a
function of temperature & composition
Glass-ceramics
under a certain conditions, a glass is possible to crystallize to form a glass-ceramic
Glass-ceramic is defined as
fine-grained polycrystalline materials
which are formed when glasses of a suitable compositions are heat treated & undergone controlled crystallization
not fully crystalline
(50% - 98% of volume) -
properties depends
on the
properties & volume fractions
of
residual glass & the crystalline phases
(e.g products : cooktop, fireplace)