Sapphire Thermal Conductivity Low Temperature

Single crystal sapphire is used as a material for substrates in super high frequency regions.

Sapphire thermal conductivity low temperature.

Excellent thermal conductivity at low temperatures allows single crystal sapphire as a transparent material to be used in many diverse fields requiring thermal conduction and heat radiation. Single crystal single crystal sapphire is used for various kinds of vacuum equipment windows in excellent thermal conductivity at low temperatures allows single crystal sapphire as a. Measured thermal conductivity of sapphire 1 c and calculated from eq. Temperature k conductivity w cm k ermal conductivity 0 to 200 k ermal conductivity 0 to 1800 k 0 01 0 1 1 10 100 1000 0 200 400 600 800 1000 1200 1400 1600 1800 absorption coe cient vs wavelength 500 c 1000 c.

Ti 15 3 3 3 has a nominal composition of 15 v 3 cr 3 sn 3 al balance ti. Sapphire wafers and sapphire substrates are available in c r a and m plane orientations. In some special instances. We offer sapphire substrates with three different surface finish qualities.

It is also used as an insulation material and microwave window. Typical properties of sapphire wafers and substrates sapphire is a single crystal al 2 o 3 with a hexagonal rhombohedral crystal structure. Sapphire optical and thermal properties graphs r6. The thermal conductivities of common substances span at least four orders of magnitude.

For example under standard conditions the thermal conductivity of copper is over 10 000 times that of air. Low temperature optical measurements will also benefit from the higher thermal conductivity of sapphire substrates and they may also be used in high temperature environments up to 2300 k. 5 1 1 low temperature x high temperature laser flash device. Good thermal conductivity and high heat resistance.

Properties of materials vary considerably with temperature thermal properties. A study of the low temperature thermal conductivity of sapphire single crystals has been made. Results of new model calculations indicate that the dependence of conductivity on length is different from the relationship obtained by other workers. Measured thermal conductivity of x a 203 and calculated from eq.

Heat capacity internal energy thermal expansion transport properties. Thermal conductivity electrical conductivity. 00 o o 200 400 600 temperature is k fig. Gases generally have low thermal conductivity and pure metals have high thermal conductivity.