silicon(ceramics) carbide
TRANSCRIPT
There are two types of ceramics.
1. Technical ceramics. ex..TiB2,alumina,bioglass,etc.
2. Non technical ceramics. ex..cement,marble,slate,etc.
TYPES
DISCOVERYIn 1891 Edward G Acheson produced a small amount of Silicon
Carbide while conducting experiments with clay & carbon.
He passed strong electric current from carbon electrode through a mixture of clay & coke in a iron bowl, which served as second electrode.
He found formula to be SiC.Silicon carbide (SiC) is a chemical compound of silicon and it is also known as carborandum
In 1893, Henri Moissan discovered the very rare naturally-occurring SiC mineral while examining rock samples found in the Canyon Diablo meteorite in Arizona. The mineral was named moissanite in his honor.
PROPERTIES
Molecular formula CSi
Molar mass 40.10 g·mol−1
Appearance Colorless crystals
Density 3.21 g·cm−3 (all polytypes)[1]
Melting point 2,730 °C (4,950 °F; 3,000 K) (decomposes)
Properties of major SiC polytypes[2][22]
Polytype 3C (β) 4H 6H (α)Crystal
structureZinc blende (cubic) Hexagonal Hexagonal
Space group T2d-F43m C4
6v-P63mc C46v-P63mc
Pearson symbol cF8 hP8 hP12Lattice
constants (Å) 4.3596 3.0730; 10.053 3.0810; 15.12
Density (g/cm3) 3.21 3.21 3.21Bandgap (eV) 2.36 3.23 3.05Bulk modulus
(GPa) 250 220 220
Thermal conductivity (W cm−1K−1)@
300K (see [29] for temp.
dependence)
3.6 3.7 4.9
Steel & energy Automotives Industrial sector Aerospace Military & Defense Medical & Health Electronics & semiconductors Others
USES
Abrasive & cutting tools.
Armors.
Automobiles
Steel production.
Carborundum printmaking.Graphene productionHeating elementsLEDsElectric systems
Electronic circuit elements
Thin filament pyrometry
Jewelry
