With the wide application of graphite products in recent years, such as graphite heating rods, graphite clamps, graphite sintering fixtures and other graphite products are more and more widely used, which is due to the superior performance of graphite. Then Xiaobian will take you to see what the superior properties of graphite products are:
(1) Graphite products have chemical stability and corrosion resistance.
Because carbon and graphite products can withstand high temperature and have good high temperature strength and corrosion resistance, many metallurgical furnace linings can be built with carbon blocks, such as the bottom, hearth and belly of iron smelting furnace, the lining of ferroalloy furnace and calcium carbide furnace, and the bottom and side of aluminum reduction cell. Many crucibles for smelting precious metals and rare metals and graphite crucibles for melting quartz glass are also graphite products processed from graphitized billets. Generally, carbon and graphite products used as refractory materials should not be used in oxidizing atmosphere. Because, whether carbon or graphite in an oxidizing atmosphere
It ablates quickly at high temperature.
Graphite has good chemical stability at room temperature, and is not corroded by any strong acid, strong alkali and organic solvent. Therefore, even if graphite products are used for a long time, the loss is very small, and as long as they are wiped clean, they are still as new.
(2) Graphite products have good adsorption.
The pore structure of carbon makes carbon have good adsorption, so carbon is often used as an adsorption material to adsorb water, smell, toxic substances, etc. We have done experiments. The graphite baking tray used for barbecue looks very clean, but when you heat it on the electromagnetic oven, you will see that the grease and harmful substances adsorbed during the last barbecue will slowly seep out. However, don't worry. You can use it after wiping it with clean paper.
(3) Graphite products have good thermal conductivity, fast heat transfer, uniform heating, and fuel saving.
Baking pans and pans made of graphite are heated quickly, and the cooked food is heated evenly, cooked from the inside to the outside. The heating time is short, not only the taste is pure, but also the original nutrients of the food can be locked. We have done experiments. When we use a graphite baking tray to roast meat, the electromagnetic oven can be preheated in only 20-30 seconds when it hits the high fire at the beginning. When we start to bake food, we only need to hit the low fire, which can be used to save energy.
According to conductivity: it can be used in electric arc furnace or submerged arc furnace to smelt various alloy steels, ferroalloys, or to produce calcium carbide (calcium carbide) and yellow phosphorus. When a strong current is introduced into the smelting area of the electric furnace through carbon electrodes (or continuous self baking electrodes - that is, electrode paste) or graphitized electrodes, an arc is generated, so that electric energy is converted into thermal energy, and the temperature rises to about 2000 ℃, so as to meet the requirements of smelting or reaction. Metal magnesium, aluminum and sodium are generally produced by molten salt electrolysis. At this time, the anode conductive material of the electrolytic cell is graphite electrode or continuous self baking electrode (anode paste, sometimes prebaked anode). The melting temperature of molten salt is generally below 1000 ℃. The graphite electrode is generally used as the anode conductive material of the salt solution electrolytic cell for producing caustic soda (sodium hydroxide) and chlorine gas. Graphitized electrodes are also used as the furnace head conductive material of the resistance furnace used to produce carborundum (silicon carbide). Carbon and graphite products are widely used as conductive materials in the electrode manufacturing industry as slip rings and brushes. In addition, they are also used as carbon rods in dry batteries, arc carbon rods for searchlights or arc generation, and anodes in mercury rectifiers.
(4) Graphite products have strong anti-oxidation and reduction effects.
After heating, products, especially graphite mattresses, can produce negative oxygen ions, activate the surrounding objects, maintain human health, effectively prevent aging, and make the skin full of luster and elasticity.
(5) Graphite products are wear-resistant and lubricating materials
In addition to the characteristics of high chemical stability, graphite products also have good lubricating performance. Under the conditions of high speed, high temperature and high pressure, it is often impossible to improve the wear resistance of sliding parts with lubricating oil. Graphite products wear-resistant materials can work in corrosive media at a temperature of - 200 ℃ to 2000 ℃ and at a very high sliding speed (up to 100 m / s) without lubricating oil. Therefore, many compressors and pumps conveying corrosive media widely use graphite products (piston rings, sealing rings and bearings) made of graphite materials. They do not need to be lubricated during operation. This kind of wear-resistant material is impregnated with ordinary carbon or graphite materials through organic resins or liquid metal materials. Graphite emulsion is also a good lubricant for many metal processing (wire drawing, pipe drawing, etc.).