Graphite felt because of the selection of the original felt is divided into asphalt cornerstone ink felt, polyacrylonitrile based (PAN based) graphite felt and viscose-based ink felt ,three kinds, the main use is as a monocrystalline silicon smelting furnace heat preservation, heat insulation material. In the chemical industry can be used as highpurity corrosive chemical reagent filter material.
Process polyacrylonitrile based carbon felt or viscosion-based carbon felt cut into the required size, rolled into a tube into a container made of graphite material, the graphite container is placed in a high temperature furnace (high temperature furnace is graphite tube furnace, medium frequency, high frequency induction furnace or other heating form of high temperature furnace), with vacuum or through high purity inert gas protection, Heating at a rate of 100 ~ 300℃/h to 2200 ~ 2500℃, and then natural cooling to 100℃.