Use cases ·

Benefits of graphite's dielectric properties

Dielectric materials are those materials that have low electrical conductivity, in other words, insulating materials electrical conductivity, in other words, insulating materials that also have the particularity of forming systems of two charges of opposite sign and equal magnitude in their magnitude in their interior, this under an electric field. Graphite is a dielectric dielectric material, for which we will further elaborate on the subject.

Benefits of graphite's dielectric properties

Dielectric materials are those that have a low electrical conductivity, in other words, insulating materials that also have the peculiarity of forming systems of two charges of opposite sign and equal magnitude in its interior, this under an electric field. Graphite is a dielectric material, so we will further elaborate on this subject.

Wasn't graphite a good conductor? This is the question you are probably asking yourselves after reading the first paragraph. Graphite, one of the allotropic and crystalline forms of graphite, has a somewhat peculiar lamellar structure that allows it to change its qualities, in this case conductivity, depending on the direction in which it is examined.

Graphite is a material with a high level of conductivity\ when its properties are measured along the basal plane. In this case the electrons can move freely.

However, this is not the case in the perpendicular direction due to the relatively high separation between the planes. In this case it becomes an insulating material with a high level of resistivity. Something similar happens with the thermal and acoustic properties of graphite.

It is likely that the main interest of dielectric materials, such as graphite, lies in their applications. These materials can be used as electrical insulators or as part of capacitors, since they exhibit two different responses to the application of an electric field.

In the first case, the current flow originated by the application of an electric field is very small compared to metals, so they can be used as electrical insulators for materials such as copper or silver, which are conductors.

The second behavior that can occur in dielectrics is the displacement of the centers of the positive and negative charges, creating an electric dipole. In other words, they are non-conducting materials whose polarization is due only to the presence of an electric field.

What is this property of graphite used for??

In electrical discharge machining (EDM) processes, the dielectric fluid is most often composed of petroleum derivatives and generally performs best when copper and graphite electrodes are used This is a cutting process whereby the electrode reproduces the image on the part by removing the material through electrical discharges, which is why it has to be performed in a liquid that does not conduct electricity.

When the graphite is immersed in these liquids, it absorbs them, so the depth of penetration of the cut will depend on the viscosity of the dielectric, the structure of the graphite, the pressure and the dwell time.

In ESGRAF we handle different graphite presentations for different industries. From powder or solid applications to complement equipment or be part of special projects.

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