Rotary joint friction materials include carbon graphite, cemented carbide, silicon carbide, silicon nitride, aluminum oxide, copper alloy, nodular cast iron, alloy steel, filled polytetrafluoroethylene, chromium oxide, ceramics, engineering plastics, etc. Carbon graphite is one of the commonly used sealing materials for rotary joints. Pairing it with other hard materials is an ideal friction pair material in rotary joints and mechanical seals. Mechanical carbon is a high-content material, but it belongs to a small variety. China lacks creative technological development and is still in a backward production mode. The raw materials used in the production of rotary joints, the size of grinding powder, the technical level of ingredients, the pressing and roasting process and equipment, and the density of the blank In terms of quality standards for impregnating materials for rotary joints, processing equipment for processing products, and processing of processing dust, there is a large gap compared with developed countries, and it has become a weak link in basic products for carbon sealing materials.