Dependence of the transmission coefficient τλ on the wavelength λ
Thermal engineering characteristics
|
Characteristic |
Value |
| Temperature coefficient of linear expansion at * 106, 0C-1 , average in the temperature range from 25 to (120) 1250 0C |
7.9 |
| Specific heat capacity at 27 0C |
257 J / (kg · oС) |
| Thermal conductivity at a temperature of 127 0C |
11.1 W / (m · oС) |
| Thermal conductivity at a temperature of 427 0C |
8.42 |
| Thermal conductivity at a temperature of 827 0C |
7.21 |
| Thermal conductivity at a temperature of 1095 0C |
4.3 |
| Melting point |
2135 ± 15 oС |
Mechanical characteristics
|
Characteristic |
Value |
| Density at 20 0C |
3.58 g/cm3 |
| Mohs Hardness |
8 |
| Modulus of elasticity (Young's modulus) |
265 GPa |
| Bending strength in the temperature range from 25 to 900 0C |
27.5 · 107 Pa |
| Compressive strength |
221 · 107 Pa |
| Microhardness |
127 · 108 Pa |
Chemical Properties
Optical alumomagnesium spinel does not dissolve in water, alkalis, acids, dissolves in hydrofluoric acid.
