china graphite electrodes suppliers

Pubdate: 07-01 2021

What are the raw materials of china graphite electrodes suppliers _ china graphite electrodes suppliers use introduction

What material are china graphite electrodes suppliers_ china graphite electrodes suppliers use introduction

Abstract: China graphite electrodes suppliers have now been widely used in our lives. So what kind of material does china graphite electrodes suppliers do? What is the material of china graphite electrodes suppliers? This article firstly introduces the definition of china graphite electrode suppliers, the analysis of the advantages and processing methods of china graphite electrode suppliers, and also the analysis of the application of china graphite electrode suppliers and its quality analysis.

What are china graphite electrodes suppliers?

China graphite electrodes suppliers refer to petroleum coke and pitch coke as aggregates and coal pitch as binder, which are made by material calcination, crushing and grinding, batching, kneading, molding, roasting, impregnation, graphitization and mechanical processing. This kind of high temperature resistant graphite conductive material is called artificial china graphite electrode suppliers (referred to as china graphite electrode suppliers) to distinguish it from the natural china graphite electrode suppliers made of natural graphite.

What are the materials of china graphite electrodes suppliers_ china graphite electrodes suppliers usage introduction

strengths of china graphite electrodes suppliers

(1) The increasing complexity of the geometry of the mold and the diversification of product applications have led to higher and higher requirements for the discharge accuracy of the spark machine. The strengths of china graphite electrode suppliers are simple processing, high EDM removal rate, and low graphite loss. Therefore, some group-based spark machine customers abandon copper electrodes and switch to china graphite electrode suppliers. In addition, some special-shaped electrodes cannot be made of copper, but graphite is easier to form, and copper electrodes are heavier, which is not suitable for processing large electrodes. These factors have caused some group-based spark machine customers to use china graphite electrode suppliers.

(2) China graphite electrodes suppliers are relatively simple to process, and the processing speed is significantly faster than copper electrodes. For example, using milling technology to process graphite, its processing speed is 2 to 3 times faster than other metal processing and does not require additional manual processing, while copper electrodes require manual frustration. Similarly, if a high-speed graphite machining center is used to make electrodes, the speed will be faster, the power will be higher, and dust problems will not occur. In these processes, choosing materials with appropriate hardness and graphite can reduce tool wear and copper electrode damage. If you specifically compare the milling time of china graphite electrode suppliers and copper electrodes, china graphite electrode suppliers are 67% faster than copper electrodes. In general electrical discharge processing, processing by china graphite electrode suppliers is 58% faster than copper electrodes. In this way, the processing time is greatly reduced, and the production cost is also reduced.

(3) The design of china graphite electrode suppliers is different from that of traditional copper electrodes. Many mold factories generally have different allowances for roughing and finishing of copper electrodes, while china graphite electrode suppliers use almost the same allowances, which reduces the number of machining operations. For this reason alone, Enough to improve the accuracy of the mold cavity to a large extent.

What material are china graphite electrodes suppliers_ china graphite electrodes suppliers use introduction

The processing method of china graphite electrodes suppliers

There are three main processing methods for china graphite electrodes suppliers: pressure oscillation method, numerical control active forming method and mechanical processing method.

(1) Pressurized oscillation method: The pressurized oscillation method requires a special machine tool, and the electrode master mold has the opposite shape to the electrode. The graphite material and the forming object are placed relative to each other during processing, leaving a certain gap. The machining fluid, which is a mixture of water and abrasives, is injected into it. When the processing fluid is passed through, the graphite and the molded object are ultrasonically oscillated. Under the action of abrasive impact force, graphite is slightly exfoliated into the required shape. The abrasive is SiC, B4C or diamond. The coarser the abrasive, the faster the processing speed. The sealed type and water curtain type are selected for processing when the machine is operating. It is suitable for EDM machining in mass production conditions.

(2) Numerical control active forming method: NC active forming method requires dedicated china graphite electrodes suppliers forming machine, which uses numerical control method, has an active tool exchange device, and can accommodate multiple tools. In order to improve the processing environment, the processing china graphite electrode suppliers are surrounded by a water curtain to prevent graphite dust from being scattered everywhere. Otherwise, the wet machining method can also be used to prevent the tool from being worn out and the graphite dust from scattering by the water-soluble cutting fluid. The machine tool has a high-performance filter device that can separate cutting fluid and graphite chips, ensuring continuous processing for a long time. It is an ideal special equipment for china graphite electrode suppliers and suitable for electrode processing for molds. However, its price is relatively high, and it is not widely used in China.

(3) Machining method: Machining method is the primary method selected by domestic general mold production units.

Graphite materials can be processed by turning, milling, drilling and grinding methods. In addition, graphite materials are prone to dust flying during mechanical processing, which will bring unfavorable effects on processing equipment and operators.

What material are china graphite electrodes suppliers_ china graphite electrodes suppliers use introduction

china graphite electrodes suppliers use

(1) Used in electric arc steelmaking furnace

Electric furnace steelmaking is a major supplier of china graphite electrodes. The output of electric furnace steel in my country accounts for about 18% of the output of crude steel, and the china graphite electrodes suppliers for steelmaking account for 70% to 80% of the total consumption of china graphite electrodes suppliers. Electric furnace steelmaking uses china graphite electrode suppliers to introduce current into the furnace, and uses the high temperature heat source generated by the arc between the electrode tip and the charge to exercise.

(2) Used in submerged electric furnace

The submerged electric furnace is mainly used to produce industrial silicon and yellow phosphorus. Its characteristic is that the lower part of the conductive electrode is buried in the furnace, forming an electric arc in the material layer, and using the heat energy declared by the resistance of the charge itself to heat the charge, which requires Submerged electric furnaces with higher current density need to use china graphite electrode suppliers. For example, every 1t of silicon will cost about about China graphite electrode suppliers, and every 1t of yellow phosphorus will cost about 40kg of china graphite electrode suppliers.

(3) Used in resistance furnace

Graphitization furnaces that produce graphite products, furnaces for melting glass, and electric furnaces for the production of silicon carbide are all classified as resistance furnaces. The materials in the furnace are both heating resistors and objects to be heated. Generally, china graphite electrodes suppliers for conductive use are embedded In the furnace head wall at the end of the resistance furnace, the china graphite electrodes suppliers used here are not consumed one after another.

(4) Used to prepare special-shaped graphite products

The blanks of china graphite electrodes suppliers are also used to process various crucibles, molds, boats, heating elements and other special-shaped graphite products. For example, in the quartz glass industry, for every 1 ton of fused tubes produced, 10 ton of blanks from china graphite electrodes suppliers are required; for every 1 ton of quartz brick produced, it is necessary to consume blanks from china graphite electrodes suppliers.

What material are china graphite electrodes suppliers_ china graphite electrodes suppliers use introduction

Material introduction of china graphite electrodes suppliers

(1) Petroleum coke

Petroleum coke is a combustible solid product obtained by coking petroleum residue and petroleum pitch. The color is black and porous, the primary element is carbon, and the ash content is very low, generally below 0.5%. Petroleum coke is classified as easily graphitized carbon. Petroleum coke is widely used in industries such as chemical industry and metallurgy. It is the primary material for the production of artificial graphite products and carbon products for electrolytic aluminum.

Petroleum coke can be divided into green coke and calcined coke according to the difference of heat treatment temperature. The former is the petroleum coke obtained by delayed coking, which contains many volatiles and has low mechanical strength. Calcined coke is obtained by calcining green coke. Most oil refineries in China only produce coke, and most of the calcination operations are carried out in carbon plants.

Petroleum coke can be divided into high-sulfur coke (more than 1.5% sulfur content), medium-sulfur coke (sulfur content 0.5%-1.5%), and low-sulfur coke (sulfur content less than 0.5%) according to the difference of sulfur content. China graphite electrodes suppliers and other artificial graphite products are generally produced using low-sulfur coke.

(2) Needle coke

Needle coke is a kind of high-quality coke with obvious fibrous lines in appearance, particularly low thermal expansion coefficient and very simple graphitization. When the coke is broken, it can be split into elongated particles according to the lines (the aspect ratio is generally above 1.75). An anisotropic fibrous structure can be observed under a polarized light microscope, so it is called needle coke.

The anisotropy of the physical and mechanical properties of needle coke is very obvious. It has excellent electrical and thermal conductivity parallel to the long axis of the particles, and has a low thermal expansion coefficient. During extrusion molding, most of the long axes of the particles are arranged in the extrusion direction. Therefore, needle coke is the key material for the production of high-power or ultra-high-power china graphite electrodes suppliers. The made china graphite electrodes suppliers have low resistivity, low thermal expansion coefficient and good thermal shock resistance.

Needle coke is divided into oil-based needle coke produced with petroleum residue as a raw material and coal-based needle coke produced with refined coal pitch material.

(3) Coal pitch

Coal pitch is one of the primary products of coal tar deep processing. It is a mixture of various hydrocarbons. It is a black high-viscosity semi-solid or solid at room temperature. It has no fixed melting point. It softens after heating and then melts. The density is 1.25-1.3. According to the unevenness of its softening point, it can be divided into three types: low temperature, medium temperature and high temperature asphalt. The yield of medium temperature pitch is 54-56% of coal tar. The composition of coal tar pitch is extremely complex, which is related to the properties of coal tar and the content of heteroatoms, and is also affected by the coking process system and coal tar processing conditions. There are many indicators that characterize the characteristics of coal tar pitch, such as pitch softening point, toluene insoluble matter (TI), quinoline insoluble matter (QI), coking value and coal tar pitch rheology.

Coal pitch is used as a binder and impregnant in the carbon industry, and its performance has a great impact on the production process and product quality of carbon products. Binder asphalt generally uses mid-temperature or mid-temperature modified asphalt with moderate softening point, high coking value, and high β resin. As impregnant, use mid-temperature asphalt with low softening point, low QI, and good rheological properties.


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