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Synthetic corundum

Synthetic corundum crystals


Synthetic corundum crystals

Area of application

·         the hour industry (hour glasses),

·         optics(windows , lenses),

·         optoelectronics,

·         microelectronics,

·         semi-conductor techniques,  

·         epitaxially structures,

·         the chemical industry,

·         components of mechanical engineering,

·         the copy industry (scanners),

·         substrates for reception epitaxially structures on the basis of nitride of gallium,

·         the jeweler industry (largely dimensional jewels),

·         laser technique (as casings for gas lasers),

·         medicine - orthopedy, stomatology.

 

 

 

Physical and chemical properties

Parameters

Values

The chemical formula

a- Al2O3

Molecular weight

101.96

Specific density

3.96-4.10g/cm3

Crystal system

Dithregonal-scalenohedral

Temperature of fusion

2050 оС

Mohs hardness:

9

Knoop hardness:

 

^ axis С

1800-2200 kg/mm2

II axis С

1175-1380 kg/mm2

Factor of refraction

1.753-1.760

Specific thermal capacity

0.8 cal/degree оС

Thermal conduction

0.01 cal/sec. cm. degree. оС

Optical type

uniaxial, negative

Solubility

steady in sour and alkaline environments

Machinability

well ground, polished, forming a smooth surface

The maximal temperature of application

1850-1920 оС

Toxicity

not toxic

Fire hazard

not flammable

Explosion hazard

not explosive

The maximal sizes

250х145х30mm

 

 

 

 

 

 

 

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