Ceramic Thermal Conductivities

The thermal conductivity of a material is a measure of its ability to conduct heat.

Ceramic thermal conductivities.

Thermal conductivity of fine ceramics thermal conduction is generated by the movement of electrons and the transfer of lattice vibrations. Macor is also a problem solvingmaterial combining the performance of a technical ceramic with the versatility of a high performance plastic. 7 82 mn 427 ag j smk for metals and 1 10 pyrex glass 2310 diamond j smk for ceramics. Metals are good conductors of electricity since the metallic bond gives rise to the free electrons where outer orbit electrons of metal atoms are shared by many adjacent atoms and they are loosely bound.

The reported values of the thermal conductivity at 300 k are distributed within a very wide range. It has a low thermal conductivity and is a useful high temperature insulator as well as an excellent electrical insulator. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. These thermal greases have low electrical conductivity and their volume resistivities are 1 5 10 15 1 8 10 11 and 9 9 10 9 ω cm for 860 8616 and 8617 respectively.

The problem with the thermal conductivity of ceramics is the dependence on the composition grain size and manufacturing process which make it rather difficult to obtain a reliable value from literature only. Kyocera is the global leading manufacturer of superior precision fine ceramics advanced ceramics. Learn about product property thermal conductivity. Conductive heat transfer per unit area can be calculated as q a 215 w m k 2 10 3 m 80 o c 86 00000 w m 2 8600 kw m 2 conductive heat transfer through a stainless steel pot wall with thickness 2 mm temperature difference 80 o c.

The thermal grease 860 is a silicone oil with a zinc oxide filler and 8616 and 8617 are synthetic oils with various fillers including aluminum oxide and boron nitride. Ceramics can withstand high temperatures are good thermal insulators and do not expand greatly when heated. Macor has a high use temperature 800 c continuous to 1 000 c peak. Fortunately many measured thermal conductivities of metals and ceramics are available 1 2.

Metals with low electrical resistance and crystals in which lattice vibrations are transferred easily for example crystals with atoms or ions of similar masses at lattice points and covalent crystals with strong bonds display high thermal conductivity. Is metal a good conductor of electricity.