Graphite powder soft, black gray, in the isolation of oxygen conditions, its melting point above 3000℃, is one of the high temperature resistant minerals. At room temperature, the chemical properties of graphite powder are relatively stable, insoluble in water, dilute acid, dilute alkali and organic solvent; React with oxygen at different high temperatures to produce carbon dioxide or carbon monoxide; Among halogens, only fluorine can react directly with elemental carbon; At high temperatures, it can also react with many metals to generate metal carbides, and metals can be smelted at high temperatures.
Use of graphite powder
1, as refractory material:
Graphite and its products have high temperature resistance, high strength properties, in the metallurgical industry is mainly used to make graphite crucible, in steelmaking commonly used graphite as a protective agent of ingot, metallurgical furnace lining.
2, as conductive material:
In the electrical industry, it is used as the coating of electrodes, brushes, carbon rods, carbon tubes, graphite gaskets, telephone parts, TV picture tubes, etc.
3, as wear-resistant lubrication materials:
Graphite is often used as a lubricant in the machinery industry. Lubricating oil often can not be used under high-speed, high temperature, high pressure conditions, and graphite wear-resistant materials can work at 2000℃ without lubricating oil. Many corrosive media conveying equipment, widely used graphite materials made of piston cups, seals and bearings, they do not need to add lubricating oil when running. Graphite milk is also a good lubricant for many metal processing (wire drawing, tube drawing).
4, for casting, sand, die and high-temperature metallurgical materials:
Due to the small coefficient of thermal expansion of graphite, and the ability to change cold and heat, can be used as a glass casting mold, the use of graphite after the black metal casting size is accurate, the surface is smooth and high yield, can be used without processing or slightly processed, thus saving a lot of metal.
5, as polishing agent and rust inhibitor:
Graphite is also a polishing agent and rust inhibitor for glass and paper in light industry, and is an indispensable raw material for the manufacture of pencils, ink, black paint, ink and artificial diamonds and diamonds. Colloidal graphite powder in graphite powder is mainly used in pen special, powder metallurgy special, lubricating oil special, grease special, dry battery special, conductive coating special, lubricating coating special, scientific research of National Defense Science and Technology Industry Commission, scientific research institutions, civil nuclear power special, aerospace special and strategic power interference, smoke screen shield development. It has become an important raw material for new composite materials in the high-tech field and plays an important role in the national economy.