Sapphire Thermal Conductivity Temperature

Thermal conductivity k strongly depends on temperature and it look like a bell.

Sapphire thermal conductivity temperature.

756 j kg c at 182 c. 2053 c 3727 f most properties useful to maximum. 23 0 w m c at 77 c. Obtained thermal conductivity reaches κ 1 104 w m k in temperature range of t 20 30 k which is a planned operating temperature of a cryogenic mirror of the large scale cryogenic grav itational wave telescope.

It is also used as an insulation material and microwave window. Good thermal conductivity and high heat resistance. 40 w m k 298 k expansion 25 c. Thermal coefficient of linear expansion k 1 at 323k.

23 1 parallel to optical axis 25 2 perpendicular to optical axis. From 0 k it is start from zero value and in a particular temperature it reach a maximum peak. At 25 c 10 14 ohm cm. 750 j k at 300 k viscosity 2053 c.

Thermal conductivity w m x k at 300k. Wood generally conducts better along the grain than across it. 4 5 10 6 k 1 and 1000 c. 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.

Sapphire is a notable example of variable thermal conductivity based on orientation and temperature with 35 w m k along the c axis and 32 w m k along the a axis. 25 8 w m c at 70 c. Single crystal sapphire is used as a material for substrates in super high frequency regions. Sapphire properties chemical properties.

Non porous unlike alumina ceramics. Some etching by hot phosphoric acid and strong caustics at temperatures exceeding 600 c 800 c thermal properties. Resistivity ohm x cm. Virtually unaffected by any solvents or acids at room temperature.

4 8 x 10 5. 9 0 10 6 k 1 90 orientation specific heat capacity. Sapphire as a reference. 6 66 x 10 6 parallel to optical axis 5 x 10 6 perpendicular to optical axis.