Proprietą
termiche
One of the most outstanding properties of quartz glass is its
low thermal expansion coefficient of approx. 0.5 x 10-6/K.
This means that thermal expansion, compared to stainless steel,
is 30 times lower during heating. In turn, the low thermal
expansion coefficient leads to an enormous thermal shock
resistance. Consequently, even product at1,000 °C withstands
exposure to cold water without any damage. In addition to the
thermal expansion coefficient, surface condition and geometry
influence thermal shock resistance. Due to the virtually
identical expansion coefficient, natural and synthetic quartz
glass can generally be combined without any problems.
|
Thermal Data |
 |
Electrical
Fused
Quartz
|
Flame
Fused
Quartz
|
Fused
Silica
|
Softening
temperature |
°C
|
1710
|
1660
|
1600
|
Annealing
temperature |
°C
|
1220
|
1160
|
1100
|
Strain
temperature |
°C
|
1125
|
1070
|
1000
|
Max. working
temperature |
|
|
|
|
|
continuous
short-term |
|
|
|
|
Mean specific
heat |
0...100°C
|
772
|
772
|
772
|
J / kg · K |
|
|
|
|
Heat conductivity |
20°C
|
1.38
|
1.38
|
1.38
|
W / m · K |
100°C
200°C
300°C
400°C
950°C
|
|
|
|
Mean expansion |
0...100°C
|
5.1·10-7
|
5.1·10-7
|
5.1·10-7
|
coefficient |
0...200°C
|
5.8·10-7
|
5.8·10-7
|
5.8·10-7
|
|
Applicazioni
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