Ceramic With High Electrical Conductivity

The electrical conductivity of the material sintered at 1600 c was measured by ac four wire method from room temperature to 1200 c.

Ceramic with high electrical conductivity.

Conductive ceramics advanced industrial materials that owing to modifications in their structure serve as electrical conductors. It features an extremely interesting combination of very high thermal conductivity and excellent electrical insulation properties. Typical electrical resistivity and thermal conductivity values of the si 3 n 4 substrates were 10 15 ωcm and 90 w mk at room temperature respectively. Aluminum nitride has a very high thermal conductivity while being an electrical insulator.

Silicon nitride si 3 n 4 a remarkable high temperature structural ceramic is commonly employed in engineering parts due to their excellent mechanical and tribological properties 1 2 however alternative functionalities such as electrical conductivity would enhance the performance of si 3 n 4 in current applications e g. The powder was synthesized by a modified glycine nitrate process at 800 c. This makes it an ideal material for use in electrical and thermal management situations. The electrical conductivities differ by a factor as large as 10 12 10 21 between metallic and ceramic materials.

With regard to electrical transport properties a high electrical resistivity of 10 14 10 15 ωcm at 323 k was observed with si 3 n 4 substrates. In addition to the well known physical properties of ceramic materials hardness compressive strength brittleness there is the property of electric resistivity most ceramics resist the flow of electric current and for this reason ceramic materials such as. Lacr 1 x co x o 3 solid solution ceramics x 0 0 0 3 were prepared by pressureless sintering of a submicrometer powder. Most of ceramic materials are dielectric materials having very low electric conductivity but supporting electrostatic field.

Ceramics porosity conductive sintering microstructure conductivity. As the temperature increases the ratio of thermal to injected carriers increases. Hexagonal boron nitride is a chalky white material and is often called white graphite it has generally poor mechanical properties. Applications for such porous electrical conductive ceramics include sensors high surface area substrates as an electrode material and energy harvesting.

The electrical conductivity of ceramic substrates is extremely low. At temperatures 500 c the grain boundary conductivity can be separated and increases upon incorporation of protons. Electrical conductivity of ceramics varies with the frequency of field. Aluminum nitride is most often the material of choice due to its relatively excellent thermal conductivity and non toxic nature.

Electrical conductivity is ability of material to conduct electric current. Reducing the static electricity of the si 3 n 4. In practice it is primarily the result impurities and lattice defects and may vary widely from batch to batch. This makes aluminum nitride predestined for use in power and microelectronics applications.