News Center-Qingdao Yuxing Graphite Products Co.,Ltd.

NEWS

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10-11

2021

Graphite can be further classified into two main categories: natural graphite and synthetic graphite.

Graphite is broadly classified into two main categories: natural graphite and synthetic graphite. Natural graphite is derived from graphite deposits and can be further subdivided into flake graphite, amorphous graphite, and massive graphite. Naturally mined graphite typically contains a high level of impurities, necessitating beneficiation to reduce these impurities before it can be used. The primary applications of natural graphite include the production of refractories, carbon brushes, flexible graphite products, lubricants, and anode materials for lithium-ion batteries; in some cases, a certain amount of natural graphite is also added during the manufacture of carbon-based products. In the carbon industry, the largest volume of production consists of various synthetic graphite products. These are generally manufactured using graphitizable petroleum coke and pitch coke as raw materials, undergoing a series of processes—including batching, kneading, molding, baking, graphitization (high-temperature heat treatment), and mechanical machining—resulting in a production cycle that can extend over several dozen days. Synthetic graphite encompasses a wide range of types, such as single-crystal graphite, polycrystalline graphite, pyrolytic graphite, highly oriented pyrolytic graphite, polyimide-derived graphite, and graphite fibers; most synthetic graphite products fall under the category of polycrystalline graphite. The principal product among synthetic graphite items is the graphite electrode used in electric arc furnaces for steelmaking and in submerged arc furnaces for smelting. Graphite electrodes are high-temperature– and corrosion-resistant conductive materials. Synthetic graphite also finds extensive applications in many other industrial sectors, including the machinery industry—for motor brushes, precision casting molds, electrical discharge machining molds, and wear-resistant components; the chemical industry—for conductive elements or corrosion-resistant equipment used in electrolytic cells; and the nuclear industry—for reactor structural materials made from high-purity, high-strength synthetic graphite, as well as for components in missiles and rockets. In addition, graphite can be processed into heat-dissipating materials, sealing materials, thermal-insulating materials, and radiation-shielding materials. Graphite functional materials are widely employed across industries such as metallurgy, chemical engineering, mechanical equipment, new-energy vehicles, nuclear power, information electronics, aerospace, and national defense. In its report “Critical Raw Materials for the EU,” the European Commission has listed graphite among 14 strategically important mineral resources facing supply shortages.

10-11

2021

Electrical and thermal conductivity

Electrical and thermal conductivity Graphite’s electrical conductivity is a hundred times higher than that of most nonmetallic minerals. Its thermal conductivity surpasses that of metallic materials such as steel, iron, and lead. The thermal conductivity coefficient decreases with increasing temperature; in fact, at extremely high temperatures, graphite behaves as an insulator. Graphite’s ability to conduct electricity stems from the fact that each carbon atom in graphite forms only three covalent bonds with neighboring carbon atoms, leaving one free electron per atom to carry electric charge.

10-11

2021

Due to its unique structure, graphite exhibits the following distinctive properties:

High-temperature resistance Graphite has a melting point of 3850±50℃; even after exposure to ultra-high-temperature electric arcs, its weight loss is minimal, and its coefficient of thermal expansion is also very low. Moreover, graphite’s strength increases with rising temperature, doubling at 2000℃.

10-11

2021

Physicochemical Properties

Graphite is soft, dark gray in color, has an oily feel, and can stain paper. Its hardness ranges from 1 to 2; however, as impurities increase in the vertical direction, its hardness can rise to 3–5. Its specific gravity is 1.9–2.3. The specific surface area typically falls within the range of 1–20 m²/g. Under oxygen-free conditions, its melting point exceeds 3,000°C, making it one of the most heat-resistant minerals. It is also electrically and thermally conductive. Pure graphite does not occur in nature; it invariably contains impurities such as SiO₂, Al₂O₃, FeO, CaO, P₂O₅, and CuO. These impurities often appear in the form of minerals like quartz, pyrite, and carbonates. In addition, graphite may also contain gaseous components such as water, bitumen, CO₂, H₂, CH₄, and N₂. Therefore, when analyzing graphite, in addition to determining the fixed carbon content, it is also necessary to measure the volatile matter and ash contents simultaneously. Graphite, diamond, C₆₀, carbon nanotubes, graphene, and other materials are all elemental forms of carbon and are allotropes of one another.

10-11

2021

Graphite is a transitional type of crystal that lies between atomic crystals, metallic crystals, and molecular crystals.

Graphite is a transitional type of crystal that lies between atomic crystals, metallic crystals, and molecular crystals. Within the crystal, carbon atoms in the same layer form covalent bonds via sp² hybridization; each carbon atom is bonded to three neighboring carbon atoms, and the six carbon atoms in a given plane arrange themselves into regular hexagonal rings, which extend to form a layered structure. In addition, each carbon atom in the same plane retains one unhybridized p orbital, which overlaps with the p orbitals of adjacent atoms to form delocalized π electrons. These delocalized electrons can move freely throughout the crystal lattice and can be excited, giving graphite its metallic luster and enabling it to conduct electricity and heat. Because the interlayer distance is large and the interlayer bonding (van der Waals forces) is weak, the layers can slide past one another; consequently, graphite has a lower density than diamond, is soft, and feels slippery.

10-11

2021

Graphite is an allotrope of carbon.

Graphite is an allotrope of carbon, appearing as a gray-black, opaque solid with stable chemical properties and excellent corrosion resistance; it does not readily react with acids, bases, or other reagents. When burned in oxygen, it forms carbon dioxide, and it can be oxidized by strong oxidizing agents such as concentrated nitric acid and potassium permanganate. Graphite is used as an anti-wear agent and lubricant; high-purity graphite serves as a neutron moderator in nuclear reactors. It is also employed in the manufacture of crucibles, electrodes, carbon brushes, dry batteries, graphite fibers, heat exchangers, coolers, electric arc furnaces, arc lamps, and pencil leads, among other applications.

03-19

2019

A comprehensive private joint-stock enterprise integrating research, manufacturing, and trade, with graphite high-tech products as its core.

Qingdao Yuxing Graphite Products Co.,Ltd. is located in Laixi City, the “Hometown of Graphite,” and was founded in 1988. Covering an area of 20,000 square meters, it is a comprehensive private joint-stock enterprise integrating research, manufacturing, and trade, with deep processing of graphite and carbon as its core business and high-tech graphite products as its flagship. Guided by technology and committed to quality and efficiency, the company leverages its strong technological capabilities to actively expand into new markets amid increasingly fierce competition. Its products are sold throughout China and exported to more than ten countries in Europe and North America. Since entering the market, the company has enjoyed an outstanding reputation at home and abroad thanks to its superior quality and high level of integrity.

03-19

2019

Raw Material Reserve

Qingdao Yuxing Graphite Products Co.,Ltd. is located in Laixi City, the “hometown of graphite”, and was founded in 1988. Covering an area of 20,000 square meters, it is a comprehensive private joint-stock enterprise integrating research, manufacturing, and trade, with deep processing of graphite/carbon as its main business and high-tech graphite products as its leading products.

03-19

2019

Standardized enterprise management, advanced processing equipment

Qingdao Yuxing Graphite Products Co.,Ltd. is located in Laixi City, the “Hometown of Graphite,” and was founded in 1988. Covering an area of 20,000 square meters, it is a comprehensive private joint-stock enterprise integrating research, manufacturing, and trade, with deep processing of graphite and carbon as its core business and high-tech graphite products as its flagship. Guided by technology and committed to quality and efficiency, the company leverages its strong technological capabilities to actively expand into new markets amid increasingly fierce competition. Its products are sold throughout China and exported to more than ten countries in Europe and North America. Since entering the market, the company has enjoyed an outstanding reputation at home and abroad thanks to its superior quality and high level of integrity.

03-06

2016

Sophisticated product testing equipment

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Address: Dongbaishi Village, Rizhuang Town,Laixi City, Shandong Province
Mobile phone: 15166670168
Mobile phone: 18669766037
Email addresses: qdxzx@xinzhongxin.cc, qdxzx01@xinzhongxin.cc

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