2023-08-15

What are the quality requirements for graphite electrodes used in DC arc furnaces

The graphite electrode used in DC arc furnaces has no skin effect when current passes through, and the current is evenly distributed on the current cross-section. Compared with AC arc furnaces, the current density passing through the electrode can be appropriately increased. For ultra high power electric furnaces with the same input power, DC electric arc furnaces only use one electrode, with a larger electrode diameter. For example, a 100t AC electric arc furnace uses electrodes with a diameter of 600mm, while a 100t DC electric arc furnace uses electrodes with a diameter of 700mm. Larger DC electric arc furnaces even require electrodes with a diameter of 750-800mm, and the current load is also increasing. Therefore, the following requirements are put forward for the quality of graphite electrodes:(1) The resistivity of the electrode body and joints should be smaller, such as the resistivity of the electrode body dropping to 5 μ Around Ω. m, the resistivity of the joint decreases to

2023-03-13

Graphite powder performance and application range

Graphite powder is a non -metal mineral material. What nature does graphite powder have? Graphite has high conductivity and thermal conductivity, highly melting point, high lubrication, plasticity and chemical stability. Graphn powder can receive corrosion of pH, organic solvent, etc. According to these characteristics of graphite powder, graphite powder is widely used in industrial fields such as chemical, petroleum, metallurgy, casting, lubrication, and sealing.What is the use of graphite powder in industrial departments such as chemical industry, oil, metallurgy? Graphite powder can be used as a guidance material to manufacture electrodes, brushes, carbon pipes, carbon rods, TV imaging tube coatings, etc. in the electrical industry. Graphite powder can be used as refractory materials, which can make protective agents for graphite and steelmaking steel ingots. Graphite powder can be used for abrasion -resistant lubrication materials, and lubricants and wear -resistant materials are

2023-12-12

Graphite heater

What are the main uses of heating welding graphite mold?

Graphite molds are mostly used to connect the railway track. According to the chemical changes of aluminum and copper powder, the liquid high temperature copper liquid is caused, and the contemporary welding method of excellent performance is used to complete the high temperature caused by chemical reactions.Heating welding is suitable for connecting copper and copper, copper and steel, steel and steel. The solubility is carried out in the heat -resistant graphite mold. The mold shellfish uses a relatively high density and good wear resistance characteristics. It can bear the melting temperature of metal materials such as copper, steel, iron, and iron, and the inflow, flow speed, and its final appearance of molten metal materials are designed.There are many specifications for the type of hedging of the welding of the insulation reactions. Generally, the detailed inspiration reaction welded powder shellfish consists of three parts:1. Graphite molds used in welding welding: mold shells

2023-04-19

Causes of inflated graphite powder

1. The purity of the selection of raw materials for the selection of nuclear high pure graphite is the same as the prerequisite for production, and it is related to the ash component of the raw materials selected by the production. The civilian type can expand graphite products that are that regularity: raw materials are ash, and their products are also large. Therefore, the oil coke ash selected by the production nuclear high -pure graphite specifies the mouth. 15%of the following, although the boron component proposes the requirements, it will be analyzed, and the specific data information will be 0.5pp. the following. Results The total ash was divided into 5 PPMs, and the boron components were mouth. LPPM up and down, the section of the hot neutron absorption is 3.8, 94 mubes. 2. High temperature adjustment treatment and other halogen to solve the temperature of the temperature when the graphitization of the product, and whether it carried out another halogen solution, which is a f

2023-05-25

Graphite pad type

Flexible graphite pads are cut from flexible graphite thin slices (or metal enhanced). They are divided into four types according to the needs of the application:1. Flexible graphite pads: cut from flexible graphite thin slices for pipeline flange and valve cover. It is recommended that this kind of pads are small diameter pads, depending on its low mechanical strength.2. Flexible graphite pad MI: The carbon steel sheet with hooks (0.2 mm thick) is sandwiched in the middle by flexible graphite thin slices, and then cut into a specific size. The mechanical strength is high.3. Flexible graphite pad PM: Flexible graphite thin slices are attached to the two sides of the 0.2 mm thick 304 stainless steel sheet. It has a high mechanical strength and is easy to transport. Because it can also be cut into a complex shape, this kind of pad film can be cut. Widely applied to various industries.4. Flexible graphite pad PM-A: Replace the stainless steel slices in T/#1215 to 316 steel (50 microns),

2023-08-02

The difference between flake graphite and expanded graphite

Flake graphite is a type of natural graphite that, after being extracted and purified, generally appears in the form of fish scales, hence it is called flake graphite. Expandable graphite refers to flake graphite that, after acid washing and intercalation treatment, expands by about 300 times compared to the previous graphite. It can be used as raw materials for coils and flexible graphite. Below, let me introduce in detail the differences between flake graphite and expandable graphite:1. The use of flake graphite is more extensive than that of expandable graphiteIn industrial production, flake graphite not only has the function of expandable graphite, but also has much better conductivity, thermal conductivity, smoothness, and so on than expandable graphite. So its practical use in industry is becoming increasingly widespread.2. The production processes of flake graphite and expandable graphite are differentFlake graphite is mainly made by mechanical damage and grinding. Expandable g

2023-02-11

Graphite electronic effect

The load migration rate of graphene at room temperature is about 15000cm2/(v · s). This value exceeds 10 times the silicon material. More than twice. Under certain conditions such as low temperature, the load migration rate of graphene can even be as high as 250000cm2/(v · s). Unlike many materials, the electronic migration rate of graphene is less affected by temperature changes. At any temperature between 50 and 500K, the electronic migration rate of a single laye

2023-02-10

Graphite development direction

(1) Renewal of graphite selection and mining technology equipment

Chemical properties of graphite and carbon materials

Carbon materials are chemically inert in non oxidizing media. Under normal temperature and pressure, no chemical changes will occur. Except for long-term immersion in nitric acid, hydrofluoric acid, or in fluorine, bromine, and other strong oxidizing atmospheres, interlayer compounds will slowly form. It is not corroded by other acids, bases, and salts, and does not interact with any organic compounds. There is no significant oxidation phenomenon of graphite within 450 ℃ in the air. It only reacts with water vapor above 700 ℃ and with CO and CO2 above 900 ℃. The temperature at which graphite produces carbides with certain metal and oxide powders is mostly above 1000 ℃.The chemical reactions of carbon materials can be divided into the following three types:(1) Gasification reaction and high-temperature oxidation reaction;(2) Solid solid reactions with metals, ceramics, etc;(3) Formation reaction of interlayer compounds.