HOPG, Highly Oriented Pyrolytic Graphite is a new kind of carbon material with high purity. It is a new kind of carbon material prepared by pyrolysis of graphite at high temperature and high pressure. Its properties are close to that of single crystal graphite.

　　To study X applications include X-ray monochromator, neutron filter and graphite monochromator, basic properties, large size, high thermal conductivity of graphite intercalation compounds and application in the field of application. The monochromator can provide a reusable smooth surface for microscopic analysis personnel. Unlike mica, HOPG is completely nonpolar, suitable for elemental analysis, and has only carbon background signals in the analysis. HOPG has excellent surface smoothness so that it can be used as a blank background unless resolution reaches atomic level.

　　The most prominent function of HOPG is to have a very smooth surface and electrical conductivity. HOPG has a layered structure, making sample preparation very simple. With a double adhesive press on the HOPG and then peel off, a new smooth conductive surface can be obtained. HOPG can be used for surface roughness measurement, surface characterization of micro properties, and other substrates used. This is due to the fact that the HOPG surface is almost a graphite layer, and the standard, highly ordered, six square atomic order is arranged to make the surface roughness less than 0.1nm. The size of the standard HOPG substrate is 10mm * 10mm * 1mm (sometimes 12mm * 12mm * 1mm). According to the Mosaic Spread HOPG value, generally can be divided into A, B, C three level, a class of products can reach 0.4 degrees, B class products are usually 0.6-1.0 degrees, C grade products for more than 1 degrees, usually used products for the B level.

　　Because of its special structure, ink has the following special properties:

　　1) high temperature resistance: Graphite melting point of 3850 + 50 degrees, boiling point of 4250 degrees, even after the ultra-high temperature arc ignition, the weight loss is very small, the thermal expansion coefficient is very small. The strength of graphite increases with the increase of temperature, and the strength of graphite is doubled at 2000 degrees centigrade.

　　2) conduction and thermal conductivity: the conductivity of graphite is one hundred times higher than that of ordinary non-metallic minerals. Heat conductivity exceeds steel, iron, lead and other metal materials. The coefficient of thermal conductivity decreases with increasing temperature, and even at extremely high temperatures, the graphite becomes hot. Graphite can conduct electricity because each carbon atom in the graphite and other carbon atoms form only 3 covalent bonds, each carbon atom still retains 1 free electrons to transport the charge.

　　3) lubricity: the lubricity of graphite depends on the size of graphite scales. The larger the scale, the smaller the coefficient of friction and the better the lubricity.

　　4) chemical stability: graphite has good chemical stability at room temperature, and can resist acid, alkali and organic solvent corrosion.

　　5) plasticity: the toughness of graphite is good, can be rolled into very thin slices.

　　6) thermal shock resistance: when graphite is used at normal temperature, it can withstand the drastic change of temperature without damaging. When the temperature changes suddenly, the volume of graphite changes little and no cracks occur.

　　Carbon Fiber sheet is a product of great dimensional stability and ease of handling. The sheet consists of a carbon fiber fabric and an adhesive polymeric material, commonly epoxy resin, adhered to the surface of the carbon fiber fabric. Carbon fiber sheets are simple in structure, but offers many properties superior to its metal counterparts, which include low weight, good chemical resistance, anti-wearing, electrical insulation and low thermal conductivity.

　　Carbon fiber sheets are commonly used in field of structural engineering, sport products, industrial manufacturing, automobile, military, aviation, and aerospace. BJgreatwall offers three types of Carbon fiber sheets: 100% unidirectional carbon fiber sheets(1K,3K,6K,12K,24K,48K), 100% bidirectional carbon fiber sheets(1K,3K,6K,12K), and hybrid carbon fiber sheets(Glass/Carbon hybrid, Aramid/carbon hybrid). The strengths of our carbon fiber materials can achieve up to T700. Among the products, we offer 3 types of weave (surface texture): plain，twill, satin and 4 types of finish :Matte , semi-gloss, gloss, high-gloss.

　　Carbon fiber sheets that we manufactured here at BJgreatwall has great fiber uniformity, resin content uniformity and price. costumers are free to choose the surface textures, finishes, sizes, thickness and shapes of the sheets base on their demand. Furthermore, for those who seek, we also offer cutting and machining, logo printing/engraving services of our products.

　　The graphite mould dies is the good choice in many industries because of its fine lubrication, high temperature resistance and thermal stability. There are many kinds of moulds for different uses, like casting mould, fine grain high purity graphite silver casting die,moulding-die of non-ferrous metals. It can also be the glass moulding and sintering of diamond .Graphite casting dies applies quality high pure graphite material to machine continuous casting dies for production of copper, brass copper and bronze products.

　　The advantages of our graphite mould dies:High temperature resistance Fine lubrication to make it easy to demould;Good chemical stability to resist the corrosion of other metals;Excellent thermal resistance; Great mechanical manufacturing property.

　　Our company can produce the graphite mould dies according to customers' drawings or requirements. Graphite mold is widely used in kinds of precision casting. It has advantages of high temperature resistant, high machining accuracy, temperature well-distributed, easy demould and so on. With the development of science and technology, graphite mold will be bound to apply in more fields.

　　We , As the professional graphite mould supplier, our factory offer competitive graphite mould. The graphite mould is made of quality graphite body to obtain the perfect seal and lasting performance .The life of our mould can be 80-100 joints ,which is more lasting than other competitor’s . Our low price die casting welding graphite mould is a simple, effective , quality welding method ,which weld the parts to desired size and type in graphite mould cave with overheat melting .Currently ,the Exothermic Welding replaced mechanical connection widely.

　　The graphite heat exchanger can be divided into 3 types: block hole type, tubular shell type and plate type structure. Block hole type: assembled from a number of large bore graphite assemblies with holes. Shell: shell and tube heat exchanger in graphite heat exchanger occupies an important position, according to the structure is divided into fixed and floating head two. Plate type: plate heat exchanger is made of graphite plate bonded. In addition, there are immersion, spray and casing type (see snake tube heat exchanger, tube heat exchanger). The graphite heat exchanger has good corrosion resistance, the heat transfer surface is not easy to scale, and the heat transfer performance is good. However, the graphite is brittle and has low flexural and tensile strength, so it can only be used for low pressure. Even if the compressive strength is the best, the working pressure of the block is generally only 0.3 ~ 0.5 mpa. The graphite heat exchanger has high cost, large volume and little use. It is mainly used in the heat transfer of corrosive medium such as hydrochloric acid, sulfuric acid, acetic acid and phosphoric acid, such as condenser used for acetic acid and acetic anhydride.

　　The graphite tube is divided into synthetic resin impregnation, water glass resin impregnation and asphalt impregnation according to the different materials impregnated. The graphite heat exchanger has good corrosion resistance, the heat transfer surface is not easy to scale, and the heat transfer performance is good. However, the graphite is brittle and has low flexural and tensile strength, so it can only be used for low pressure. Even if the compressive strength is the best, the working pressure of the block is generally only 0.3 ~ 0.5 mpa.

　　Block hole type: it is composed of several porous graphite elements with holes.

　　The shell and tube type: shell and tube heat exchanger in graphite heat exchanger occupies an important position, according to the structure is divided into fixed and floating head two.

　　Shell and tube heat exchanger (shell and tube heat exchanger) is also called tubular heat exchanger. The utility model relates to a wall heat exchanger with a wall surface closed in a tube bundle in a shell as a heat transfer surface. This kind of heat exchanger is simple in structure and reliable in operation. It can be made of various structural materials (mainly metal materials) and can be used at high temperature and high pressure. It is the most widely used type at present.

　　Board type: plate heat exchanger is made of graphite plate bonded. In addition, there are immersion, spray and casing type (see snake tube heat exchanger, tube heat exchanger).

　　Plate heat exchanger is a new type of high efficiency heat exchanger which consists of a series of corrugated metal sheets. Thin rectangular channels are formed between the plates, and heat exchange is carried out by halves. Plate heat exchanger is the ideal equipment for heat exchange between liquid, liquid and steam. The utility model has the advantages of high heat exchange efficiency, small heat loss, compact structure, light weight, small occupation area, convenient installation and cleaning, wide application, long service life, etc.. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, and the floor area is 1/3 of the tubular heat exchanger, and the heat recovery rate can be as high as 90%.

　　The graphite plates are made from the domestic petroleum coke. Our graphite plates include molded, extruded and isostatic.

　　Graphite Plates are widely used in the metallurgy, machinery, electronics and chemical industry, glass & jewellery, and heating & furnace industries. The graphite plates are often used for fuel cells, electrolysis, electroplating, and other various mechanical applications where friction, heat, or electrical properties are factors. They are tough and can withstand repeated wear and tear, apart from being good conductors of heat and electricity.

　　Our graphite bipolar plates have the features as below: Low thermal expansion coefficient; Better thermak conductivity;Stable chemical perfermance; Better corrosion resistance; Stronger electrical conductivity.

　　The graphite plate also can be used extensively in industries like solar, foundry, chemicals, electronics, ferrous metals, high-temp,and so on... Applied to heat conduction, metallurgy, lubrication, anti-corrosion, solar electrical energy generation,wind power generation equipment, electric automobile. Etc.

　　Graphite plate is widely used in electron industry, chemical industry, mechanical industry, aviation industry, manufacturing industry, metallurgic industry and so on, such as anode, cathode, bipolar plate, vacuum furnace, water treatment, hydrogen fuel cell, electrode, casting, glass factory, heat conduction, lubricant, mold industry, vacuum pump and so on.

　　Our graphite bipolar plate could be impregnated by resin,it could be reduce the porosity and improve the strength and usling life.Our graphite bipolar plate is made of high quality graphite.The graphite material has good property,like light weight,easy to install and low price.We have produce the bipolar plate for many years,and we export to many country.We could also produce the plate as your demand.

　　Clay bonded Graphite Crucibles are made from high purity and fine grain graphtie.the binder is the clay and the main materials is crystalline flake graphite. It can be used in non-ferrous metals smelting , carbide feed generator carburization quenching.

　　The clay bonded graphite crucibles have the characteristics such as high temperature resistant, quickly heat conduction, good thermal shock resistance, good thermal stability,good corrosion resistance.

　　We have two kind of the clay graphite crucibles: the first kind can be in high temperature degree of fire resistance 1650°C, volume density1.65g/cm3,the second kind graphite crucible at degree of fire resistance 1400°C, its volume density1.52g/cm3.

　　The clay bonded graphite crucible with good thermal conductivity and high temperature resistance, at high temperature in use process, small thermal expansion coefficient, the thermal shock, quenching has certain strain resistance. Of acid and alkaline solution of strong corrosion resistance, excellent chemical stability.

　　The clay graphite crucibles are used in metallurgy, casting, machinery, chemical and other industries, because it has more excellent performance, so it also has been widely used in alloy tool steel smelting and smelting of nonferrous metals and their alloys. And has a good technical and economic effect.

　　Our clay graphite crucibles are of good quality, long service time, also we can customize any size as per your requirement. It has top quality crucibles offer consistent performance when melting ferrous, onferrous and precious metals.Its good thermal conductivity keeps metal from cooling too rapidly. Made of natural flake graphite and silicon carbide bonded with find clay, lined with mullite for long life.

　　Our graphite crucibles are suitable for melting various metals as copper, gold ,silver, zinc, aluminium , lead .etc

　　Graphite has excellent physical, chemical and mechanical properties, and has been widely used in metallurgy, machinery, electronics, national defense, aerospace and other fields. According to experts estimate, by 2020, the global demand for natural graphite will be added to 2 million 600 thousand tons, new power, new materials and other new rapid development of the industry, but also to the graphite industry has brought new opportunities for development. Industry advocates, the next step should be in establishing and improving the relevant professional management system together, will be the main capital of graphite to strategic heights.

　　China is a big producer of graphite, and its capital reserves are rich. According to industry experts, China graphite capital mainly distributed in Heilongjiang, Inner Mongolia, Shandong, Hunan, Shanxi (soil shaped graphite) and Jilin, which is the largest crystalline graphite reserves in Heilongjiang Province, accounting for about 57.87% of national reserves, followed by Shandong, Inner Mongolia, Henan and Sichuan; Hunan Province, the largest reserves of graphite, followed by Jilin, Shaanxi, Fujian and Anhui.

　　Data show that in 2013, China's natural graphite output value of 810 thousand tons, accounting for 68% of global output. "International graphite recorded proven reserves calculation, Chinese graphite reserves ranked first in the international, National Engineering Research Center, said Professor Wang Xuequn, the skills of deep processing of metal mine in 2014, China output of 650 thousand tons of natural flake graphite, including the production and operating data and customs data, Chinese output has reached 610 thousand of natural flake graphite 2017 will exceed 700 thousand tons tons..

　　The first National Non-metallic Mineral Processing Engineering Research Center Professor He Baoluo and other experts believe that, the iron and steel industry, foundry industry is the largest use of graphite, annual production of over 300 thousand tons, there will be a contraction in the future; secondly, the use of big flake graphite preparation expansion stone processing paper, ink, graphite graphite gasket and sealing materials, graphite packing, insulation materials, annual demand over 200 thousand tons, the future trend will add.

　　The future of the graphite industry is very broad. One is the traditional category of industrial structure optimization and upgrading and constantly pulling new category of graphite spent widening, is to add some commodity future market graphite; two is to follow the Chinese vigorously carry out energy-saving environmental protection, new energy, biotechnology, high-end equipment manufacture, new materials, new power cars and other strategic new industries, and femoral graphite industry the rapid development of. "Natural graphite, the low price for the aphanitic graphite quotation, used to produce low-end graphite products, the future cost of adding graphite occupation in the first category of photovoltaic, semiconductor materials, lithium batteries and fuel cell etc.."

　　Special graphite covering a wide range of industry have different understanding and classification of carbon products Chinese industry, electrical carbon products of natural graphite products industry and metallurgy, metallurgy is used to explain the classification of carbon products, special graphite mainly refers to high strength, high density, high purity graphite products (referred to as the three high graphite). From the three high graphite material structure can be divided into coarse grain structure, fine grain structure and fine grain structure of three kinds of molding methods are distinguished from molding special graphite, extrusion molding and special graphite isostatic pressing special graphite three categories, in addition, vibration molding can also be used in the production of special graphite. High quality special graphite, an isotropic graphite, is a kind of special graphite produced by isostatic pressing.

　　Not all special graphite must achieve the same high density, high strength, high purity indicators, special graphite used in different occasions, has a specific intensity, density requirements, that is, strength, density index is not the same. Many special graphite do not need to achieve high purity, ash is not the main quality index. Some special graphite does not need high strength and high density, but it needs high purity. Some special graphite, such as EDM graphite, according to different processing technology and processing objects, require different physical and chemical indicators of fine particles, graphite or superfine particles, structural graphite.

　　Special graphite for electrical discharge machining

　　EDM is a new processing technology in machinery manufacturing industry, EDM of many high hardness metal processing, and processing of complex shape, high precision parts, can be used as a tool for the anode copper material, also can use graphite materials. As a tool for EDM, the graphite material of electrode must meet the following conditions:

　　(1) the structure is compact and the tissue is homogeneous; there should be no coarse particles and large pores;

　　(2) with high mechanical strength and good processability, it can work out complex shapes or sharp angles and flakes;

　　(3) the graphite tool electrode has a certain loss in the process of EDM, and this loss should be as low as possible;

　　(4) the discharge characteristics are stable and the processing speed is faster. Therefore, graphite with fine grain structure or graphite with fine particle structure is generally used in EDM, and the physical properties of graphite are best isotropic. Therefore, the graphite material with fine grain structure is the most popular graphite material used in China's electrical discharge machining.

　　1. It is made of high strength pressed high purity graphite material. It has high strength, strong oxidation resistance and long service life.

　　2, the use of machining centers and CNC machine tools fine machining, high accuracy, good concentricity, jitter in the use of small, effectively prevent high-speed fracture, reduce accidents.

　　3. The graphite turntable has several wheels. When rotating, it can form gas / liquid flow, increase the contact area and contact time between the bubbles and the aluminum alloy liquid, and improve the degassing effect. The friction between the wheel and the aluminum alloy is relatively small. Thus, the degassing rate is above 50%, the smelting time is shortened, and the production cost is reduced.

　　4, the graphite rotor is a liquid aluminum alloy purification process, is to improve the comprehensive performance of aluminum alloy necessary supplies. In the purification process, the purification of gas and solvent, the use of graphite rotor rotating jet to the molten aluminum for purification treatment method, is the most advanced international treatment methods.

　　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.