What are the characteristics of graphite rotors with graphite support rods compared with other rotors?

　　1. In aluminum foil casting, aluminum alloy hub and other aluminum processing industry, the cycle is up to 2 months.

　　2. The rotating refining degasser is divided into movable and fixed mode, which can be applied to different operating environments. The

　　3. Degassing rate is above 50%, the smelting time is shortened and the production cost is reduced.

　　4. is suitable for purifying the aluminum liquid in the crucible furnace, the ladle and the static box.

　　5. Surface after oxidation treatment, the service life is about 5 times of the ordinary product, widely used in the aluminum alloy casting industry.

　　There is a special application in graphite products, that is, the graphite rotor. What is the graphite rotor? The purification process of liquid aluminum alloy is the main means to improve the comprehensive properties of aluminum alloy. In the purification process, mixing the purified gas and solvent and using the rotary injection of graphite rotor to melt the aluminum melt is the most advanced method in the world.

　　Graphite rod support graphite rotor rotating nozzle by high purity graphite, the structure should be considered in addition to the nozzle scattered outside the bubble, the centrifugal force is produced by stirring Aluminum Alloy melt, melt into the gas nozzle and the level of spray mixing, the formation of gas / liquid flow ejected, the contact area and the contact time increases with the aluminum bubble the liquid metal, improve the degassing effect.

　　The rotational speed of the graphite rotor can be controlled by the frequency converter to realize the stepless adjustment, and the maximum can be reached. Graphite rotor specifications, impeller specifications, high purity antioxidant graphite rotor has high strength, high temperature resistance, corrosion resistance and so on. In the process of purifying and degassing, the surface of the aluminum alloy liquid in the box is covered with nitrogen to cover the protection, so that the part of the graphite rotor exposing the aluminum alloy liquid is in the inert gas, so as to prevent the rotor from oxidizing at high temperature and prolong the service life of the rotor.

　　The impeller shape is streamlined, which can reduce the resistance when rotating, and the friction and scouring force between the impeller and the aluminum alloy liquid is relatively small. Thus, the degassing rate is above 50%, the smelting time is shortened and the production cost is reduced. The service life of the surface is about 5 times that of the ordinary product. It is widely used in the casting industry of aluminum alloy.

　　The working principle of graphite copper sleeve: general solid lubricant accounted for friction surface area 20-30%, lubrication principle of graphite self-lubricating bearing copper sleeve is in sliding friction process of shaft and bearing, graphite particles as part of transfer to the friction surface of the shaft and the bearing on the formation of a layer of relatively stable solid lubricating diaphragm. To prevent the direct adhesion of shaft and bearing wear. This combination of rationality combines the advantages and disadvantages of the metal alloy and the non-metallic antifriction material, and is complementary to each other, namely, the high carrying capacity of the metal, and the lubricity of the antifriction material. So it is especially suitable for the environment such as no refueling, less fuel, high temperature, high load or water. B: Graphite copper sleeve and self-lubricating bearing in copper sleeve as the friction surface of metal matrix is developed on the order and proper size of cavities, and embedded graphite or molybdenum disulfide as a solid lubricant with self lubricating performance products. The graphite copper sleeve has been widely used in engineering machinery, metallurgical machinery, mining machinery, locomotive frame, rolling equipment, ship machinery, mold equipment, textile machinery, such as gas turbine of low speed and heavy load, high speed and light load and other occasions.

　　The bearing is a sliding parts commonly used in machinery industry, material and metal, nonmetal, composite materials don't. Graphite bearing is with the performance requirements of mechanical equipment, carbon bearing based on metal bearings and the development of the graphite material as the main material. Graphite bearings are different from the characteristics of metal bearings, mainly in: self lubrication, high temperature resistance, corrosion resistance, light weight, etc..

　　Excellent properties of graphite bearings:

　　1, good self lubrication:

　　Because of its lamellar crystal structure, graphite has the property of self lubrication, and is suitable for the high temperature environment, the liquid and the unsuitable lubricant,

　　Especially in the absence of lubricant, the friction coefficient is lower than other materials.

　　2, good chemical corrosion resistance: not susceptible to acid, alkali and inorganic salts and other chemical erosion.

　　3, good heat resistance:

　　Mechanical strength and sliding characteristics will not cause any changes due to heat;

　　4, excellent heat shock resistance:

　　Compared with the low thermal expansion coefficient and good thermal conductivity of the metal material, even the sharp temperature change will not produce the crack.

　　5, benefit to light design:

　　Compared with the small volume density of the metal material, the utility model is beneficial to the light weight of the machine and reduces the sliding noise.

　　6, increase the use of products:

　　According to the specific needs of customers and the use of the environment for the deep processing of graphite bearings, increase the product in different environments, wear resistance, high temperature resistance, corrosion resistance.

　　Application: at present in food, beverage, textile, printing and dyeing, chemical and other industries in the conveyor bearings, centrifugal pump, submersible pump bearing, gear bearing bearings and automotive, aviation, agricultural machinery and other aspects of different degree has been applied, these parts such as grease lubricating agent will inevitably cause pollution and the graphite bearing lubrication is very strong, and can run on without the use of lubricating oil.

　　Graphite rotor is composed of two parts of rotor bar and nozzle. The transmission system drives graphite rotor rotation, argon or nitrogen via the rotor pole, aluminum melt blowing nozzle. High speed rotating graphite rotor into aluminum melt with argon or nitrogen scattered many small bubbles, which are dispersed in the liquid metal, and the rotation of the rotor to hydrogen and inclusions in Al melt diffusion, the bubble contact, bubbles in the melt by the gas pressure difference and surface adsorption principle, absorption melt the hydrogen adsorption and oxidation slag, and with the bubble was taken out of the melt surface, the melt will be purified.

　　Graphite rotor speed can be adjusted by frequency converter to achieve stepless regulation, up to 700 r/min. Specification for graphite rotor diameter of 70mm ~ 250 mm, specifications for the impeller diameter 85mm ~ 350 mm, high purity graphite oxidation rotor has the characteristics of high strength, high temperature resistance, corrosion resistant aluminum flow. In the gas purification process, the surface is Aluminum Alloy liquid nitrogen into the cover, the graphite rotor exposed Aluminum Alloy liquid in an inert gas and prevent the rotor of high temperature oxidation, prolong the service life of the rotor. The impeller is streamlined, can reduce the resistance of rotation, the friction between the impeller and the aluminum alloy is relatively small. So that the gas removal rate is above 50%, the smelting time is shortened, and the production cost is reduced.

　　Using graphite rotor operating technique:

　　1, before using the preheating: graphite rotor immersed in liquid aluminum, above the liquid surface is about 100mm at 5min~10min, to avoid quenching effect on material; must pass into the liquid gas rotor; rotor can be put forward in the surface after the cessation of gas supply, to prevent the rotor nozzle clogging pores.

　　2, the separation of air: in the purification tank room through the nitrogen or argon, to ensure that the box room for positive pressure, isolation of foreign air, to prevent the oxidation of graphite rotor.

　　3, the rotor immersed depth: the reasonable depth of graphite rotor immersed in molten aluminum, to strengthen the surface of aluminum exposed set below about 80mm, soaked in 60mm, which can effectively increase the rotor loss and erosion time antioxidant.

　　4, smooth transmission system: graphite rotor and transmission system is through a connecting rod (pipe) are connected, the connecting rod long deformation under high temperature, or transmission equipment related parts loosening will affect the rotor of neutral and running stability, easy to make the graphite rotor broken or bump damage.

　　5, to pure argon or nitrogen: if the pipeline, connectors and other components of gas leakage caused by argon or nitrogen gas into the aluminum melt is not pure, the upper part of the rotor is oxidized seriously, even make several jet holes at the lower part of the rotor is also oxidized, it will greatly shorten the service life of the rotor.

　　Graphite is a covalent semiconductor and metal intermediate half of the metal, inherently good conductivity, thermal conductivity, and most of the molten metal does not react, high temperature state is not deformed (up to 27.. C) and with the temperature increases the electrical conductivity and thermal conductivity, strength is significantly increased (mechanical strength at 1800 C is two times at room temperature), low thermal expansion coefficient than metal, as the ideal material can be widely used in powder sintering industry. The use of graphite mold powder sintering industry began in the early 70s, accompanied by geological exploration, coal exploration and mining, oil exploration and drilling, highway cutting, especially the rapid development of granite and marble mining and cutting industry, demand a substantial amount of diamond alloy material and hard alloy materials increased demand for graphite sintered die with the graphite sintered die matched with the increases. This situation has started since the end of 70s, preliminary statistics, annual domestic need 9000000 sets of graphite mold, the annual amount of 2500 tons. At the same time as a branch of the graphite material, its specifications and materials are gradually standardized and the trend of the series

　　With the exploitation of marble, granite marble cutting, the need for the cutting of the highway and so on. So in the end of 70s there was a square of processing and growth of graphite mold, processing different types of saw blades, that is divided into. 350,. In 400, 450, 600, 1200, in 1400, 1600, 1800 specifications, with the corresponding specification requires alloy, graphite sintered die and different types. On the shape of the graphite sintering mold can be divided into single groove double groove and combination of molds and so on.

　　The purity of the sintered graphite is not as strict as that of the high purity graphite. In simple terms, the material removal characteristics of graphite should have, as their body heat, we must also have some resistance to pressure in heating condition, so it must have certain mechanical strength.

　　Graphite material has the characteristics of light weight, high temperature resistance and ablation resistance. It is the preferred material for the solid rocket motor (SRM) of small rocket, graphite nozzle. As early as 1947, the United States launched solid rocketsonde successfully using graphite throat liner, after gradually developed with ATJ as the representative of the first generation of high strength graphite throat liner material with high density and high strength graphite, G90 as the representative of the second generation of throat liner materials 1 - 2, with Graphnol of isotropic graphite as the representative of the third generation of throat liner material 3. At the beginning of 1960s, the research and development of SRM throat liner material with graphite and refractory metals was proposed. By the Chinese Academy of Sciences. T705 is now popular.

　　A, Jilin carbon factory, Xi'an Aerospace Composite Materials Institute developed the first generation of silicon zed KS8 high strength graphite throat liner. KS8 C17 8 graphite is imitation of the former Soviet Union, and in Jilin carbon factory batch production, to solve the problem for crack development process of silicon zed layer thickness and the heat generated by the. With four of the space science and technology based on SRM by steering model development and lay a solid foundation of throat liner material, has been successfully applied to the first artificial earth satellite in China -- the final SRM dong-fang-hong I on.

　　For the development of solid propellant can adapt to the demand, improve the ablation performance, resistance of graphite throat liner in mid 1960s by the Chinese Academy of Sciences, Shanxi Institute of coal chemistry, Harbin Institute of electrical carbon, Xi'an aerospace composite materials developed the second generation of high density and high strength graphite T704. At the beginning of 80s, the T705 graphite was developed by Harbin electric carbon and Xi'an aerospace composite materials, all of which were produced in Harbin electric carbon factory. The grain size in graphite by using ingredients, sulfur modified coal tar pitch binder, hot molding process and constraint roasting technology innovation, greatly improve the graphite material yield and erosion resistance, has been successfully applied to a variety of small tactical missile SRM throat in 4 - 6. The Jinji group by Ordnance Group Corporation Harbin electric carbon factory developed cold molded T707 and T715 graphite, Xingtai electric carbon factory developed cold molded T711 graphite, as a small rocket SRM throat materials, also belongs to the second generation of throat liner material. Chengdu carbon limited development of isostatic pressing isotropic

　　CDK20 graphite, as the third generation of the small rocket SRM throat lining material, is working with the aerospace technology group, the seven Institute of applied research.

　　Thermal conductivity of graphite, also known as the graphite radiating fins, a new thermal cooling material, has the unique grain orientation and along the two directions of the uniform heat conduction, the lamellar structure can well adapt to any surface, the heat shield assembly and improve consumer electronic products performance.

　　The unique combination of thermal conductivity and thermal conductivity of graphite thermal conductivity is a good choice for the thermal management solution. Ultra high thermal conductivity in the plane of thermal conductive graphite sheets with W/m-K 150-1500.

　　The chemical composition of the thermal conductivity of graphite materials (thermal flexible graphite sheet is mainly single carbon (c) elements, is a kind of natural elements in minerals. Polymer film can be graphite film is obtained by the chemical method of high temperature and high pressure, because carbon is a non-metallic element, but there are metal conductive, thermal performance, also has like organic plastic plasticity, and special thermal properties, chemical stability, lubricating and can coating on the solid surface of some good process performance, therefore, thermal conductivity of graphite in the electronics, communications, lighting, aerospace and defense industry and other fields have been widely used.

　　The graphite heat conduction material provides a unique solution to the heat management industry. Thermal conductivity of graphite materials through a series of different thermal management solution application bring new technical solutions to the needs of the increasingly wide range of industrial cooling, thermal conductivity of graphite materials products provide the electronic industrial heat management of innovation and new technology. Thermally conductive graphite by reducing the weight of the device to provide a more excellent thermal conductivity, thermal conductivity graphite solution is a new application of thermal design. Graphite heat conducting and effectively solve the problem of thermal design of electronic equipment, a wide range of applications in PDP, LCD TV, notebook PC, UMPC, flat panel display, MPU, projector, power supply, LED electronic products heat graphite materials. Graphite heat sink material has been widely used in the communication industry, medical equipment, SONY/DELL/Samsung notebook, ZTE mobile phone, PDP Samsung, PC of memory, LED substrate, such as heat.

　　Overview of graphite heat sink

　　The heat conducting graphite sheet is a new kind of heat conduction and heat radiating material. It is in the same direction along the two directions. It also improves the performance of the consumer electronic products.

　　Product application (Application): IC, CPU, MOS, LED, heat sink, LCD-TV, notebook computers, communication equipment, wireless switches, DVD, handheld devices, camera / digital camera, mobile phone.

　　Main features: ultra high thermal conductivity / easy to operate, low heat resistance, light weight.

　　The mechanical graphite products which made of the wear-resistant carbon and graphite products are often used in the machinery industry and in the chemical production as a structural material extensively , it has become an important branch of carbon and graphite products industry, regardless of in the domestic or foreign, the variety and quantity of the wear-resistant carbon and the graphite products are in rapid development.

　　The mechanical graphite products materials compared with many metal or non-metallic materials, it has the high thermal stability, the higher thermal conductivity, the low thermal expansion coefficient , especially the carbon and graphite materials have no chemical reaction with the majority of acid, alkali and salt solution.

　　The graphite material has the self lubrication performance, in the absence of lubricant and fricting with many metal parts , the friction coefficient of the graphite components is only 0.04-0.05, that is to say, the coefficient of friction is low. Because most of the lubricating oil will break down or even catch fire at the high temperature, so many equipments which are in the high speed, high pressure and high temperature operation can not use ordinary lubricating oil to improve the wear resistance of moving parts. Therefore, at present, in some mechanical equipment , we use bearing, piston, piston ring and sealing ring mechanical graphite products which are made from the carbon and graphite materials. The mechanical graphite products made of carbon and graphite can be in the corrosive media which the temperature range from -200 degrees Celsius to +200 degrees Celsius, and in a high speed of movement (such as 100 m / s) without lubricating oil and normal operation.

　　All kinds of mechanical graphite products produced by our company are widely used in various kinds of mechanical equipments in modern industry. Due to the self lubrication, high and low temperature resistance, corrosion resistance and other characteristics, it can meet the strong corrosive, inflammable, explosive and radioactive medium sealing requirements. It solve the problem of "deflation,steaming, driping, leaking" in chemical equipment effectively, and it has good effect on improving working conditions, improving product quality and productivity.

　　The mechanical graphite products are widely applicable to a variety of pumps and mechanical stirring, high temperature and high pressure dyeing machine, compressor, chemical reaction kettle mechanical seal assembly of sealing ring, oxygen making machine, piston ring blower, motor shielding, Bush and submersible motor and a variety of instruments with graphite bearing, petrol pumps, vacuum pumps, gas compressors, printing machine composite air pump device of rotary; chemical equipment safety blasting membrane plate; cigarette equipment in a gas distribution plate, the arc block and so on.

　　The graphite parts dipped with Ag have many good performance,such as it can be used under the 900centigrade situation,corrosion resistance,mechanical strength and good wear resistance.The graphite dipped with Ag is hard to process,and it cost much.

　　The technology of the graphite-Ag need Hi-tech processing and precious metals. And it once used for military,and the exporting is also forbid.

　　The process technology of the graphite-Ag is not easy,it need complex impregnation system,and special graphite raw material.make the carbon/graphite material as the matrix,make it under the high temperature and make the melt Ag into the graphite porosity,and got the graphite–Ag material. The graphite dipped with Ag has a low density,low C.E.T.and high mechanical strength,and the friction is also low.

　　The graphite dipped with Ag ofter used as sealing material,and it need a low porosity,the best porosity is below 2%. And the graphite-Ag has a good heat shock resistance,under the cold and hot situation the material will not be broken. After the testing ,we could found something white on the surface of the graphite,it’s the AgO,that’s because the testing is in the air, if it’s in the vacuum condition,there will not be the AgO.

　　The graphite parts with Ag can be under the high pressure situation,and the compressive strength is higher than the flexible strength,so when we use the parts,it’s better to make it under the compress situation not vibration or friction situation. And reduce the vibration during the working situation.

　　Ag will easy to be oxidation in the air environment,so the graphite parts need to dry before using each time.

　　The graphite dipped with Ag can be used for military,such as torpedo accessories or rocket nozzle. Now it can also used for the civil use.

　The growth of silicon crystal need the graphite crucible,graphite parts etc.graphite material,and the isostatic graphite material is one of the most important material in the world now. The isostatic graphite material is made in a high pressure container,and use the liquid media with an un-pressed property and the uniform delivery pressure property. As it will press the material from all the directions,so the pressure will be the same from all the directions.

　　The isostatic graphite material from Japan meet the world advanced level,no matter the quality,items,specification etc, the most representative company is TOYO Carbon. And the U.S is the first country to do the business and research on the isostatic graphite material. Another one is SGL from Germany,and except for the isostatic graphite material ,SGL also do well in the extruded graphite material,molded graphite material,the products are widely used in the photovoltaic industry.

　　The characteristic of the isostatic graphite material is : the properties is same from different directions,and the structure of the material is compact,the strength of the surface is strong,the resistance to shock is well,and the property of thermal resistance is better than other materials.

　　As the graphite parts have many good performance such as thermal resistance,pressure resistance,corrosion resistance and good electrical conductivity,stable property etc. So it’s widely used for the polysilicon production. But the selection criteria of graphite is very strictly,the graphite material need to purify to reduce the metal particle and other impurities. Currently,the way to purify is accessing the chlorine gas.

　　The technology to purify the graphite material is taking advantage of the high stable of the carbon,through the high temperature, vacuum and oxidizing gas to purify the graphite material.

　　the pressure should be the 5% of the atmospheric pressure,and the temperature should be above 2000centigrade,during this processing,it should be access the oxidizing gas such as the chlorine gas.