Toray Metallurgical Nickel-Plated Carbon Fiber Powder, Wave-Absorbing and Electromagnetic Shielding 400-Mesh Nickel-Plated Carbon Fiber Powder

Product Description

Technical Parameters
Nickel layer thickness: 0.3μm. Nickel 0.8g/m, nickel proportion 50%

Shenzhen Turing Evolution Technology Co., Ltd. is affiliated with a top 100 enterprise in Guangdong Province. It was established in September 2006 with a total asset of nearly 100 million yuan. The company has mastered the kiloton-level technology for T300 and T700 grades, and the hundred-ton-level technology for T800 and M30 grades, and owns independent intellectual property rights in key technologies and core equipment.

Since its establishment, Shenzhen Turing Evolution Technology Co., Ltd. has accumulated nearly 10,000 tons of carbon fiber sales, accounting for most of the sales in the domestic carbon fiber market.

The products are widely used in industrial fields such as carbon-carbon composite materials, composite cable cores, pressure vessels, medical devices, and civil engineering, as well as in the sports and leisure field. They have received good evaluation in trial use in national defense and military fields such as aerospace, ordnance industry, and nuclear industry, and have extensive applications in emerging fields such as new energy vehicles, rail transit, wind power generation, and marine engineering.

Shenzhen Turing Evolution Technology Co., Ltd. is located in the Shenzhen Special Economic Zone, Guangdong, China. It is committed to providing the world with integrated solutions including carbon fiber precursor research and development, carbon fiber production, and carbon fiber composite product research and development. Currently, it has a carbon fiber precursor production capacity of 13,000 tons and a carbon fiber production capacity of 5,000 tons. It is an enterprise that has realized kiloton-level fiber industrialization production and an enterprise that has developed dry-jet wet-spinning technology to prepare high-performance carbon fibers. The company has independently developed and built a complete set of high-performance carbon fiber precursor and carbonization production lines, mastered core technological processes such as ultra-large-capacity polymerization, dry-jet wet-spinning, and homogeneous pre-oxidation carbonization, as well as key equipment manufacturing, and can stably produce SYT45, SYT49, and SYT55 grade high-performance carbon fibers in batch and large scale.

Shenzhen Turing Evolution Technology Co., Ltd. took the lead in the industry in passing the ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health and safety management system certification, and ISO10012 measurement inspection system certification. It has established a high-performance fiber testing center and a new product research and development center, and has participated in the formulation of national standards for carbon fiber and precursor products.

Carbon fiber (CF for short), is a new type of fiber material with high strength and high modulus fibers containing more than 95% carbon. It is a microcrystalline graphite material made by stacking flake graphite microcrystals and other organic fibers along the axial direction of the fibers, followed by carbonization and graphitization treatment. Carbon fiber is "soft on the outside and rigid on the inside". It is lighter in weight than metallic aluminum but stronger than steel. It also has the characteristics of corrosion resistance and high modulus, making it an important material in both national defense and military industries as well as civil applications. It not only has the inherent properties of carbon materials but also possesses the soft processability of textile fibers, making it a new generation of reinforcing fibers.

Carbon fiber has many excellent properties. It has high axial strength and modulus, low density, high specific performance, no creep, resistance to ultra-high temperatures in non-oxidizing environments, good fatigue resistance, specific heat and electrical conductivity between non-metals and metals, a small thermal expansion coefficient with anisotropy, good corrosion resistance, and good X-ray permeability. It also has good thermal and electrical conductivity and excellent electromagnetic shielding properties.

Compared with traditional glass fiber, the Young's modulus of carbon fiber is more than three times that of glass fiber; compared with Kevlar fiber, its Young's modulus is about twice that of Kevlar fiber. It is insoluble and non-swelling in organic solvents, acids, and alkalis, with outstanding corrosion resistance.

On February 15, 2016, China successfully developed high-performance carbon fiber by breaking through Japan's control and blockade.

Composition and Structure

Carbon fiber is an inorganic polymer fiber with a carbon content higher than 90%. Among them, those with a carbon content higher than 99% are called graphite fibers. The microstructure of carbon fiber is similar to artificial graphite, with a turbostratic graphite structure. The distance between the layers of carbon fiber is about 3.39 to 3.42 angstroms. The carbon atoms in each parallel layer are not arranged as regularly as in graphite, and the layers are connected by van der Waals forces.

The structure of carbon fiber is usually considered to consist of two-dimensionally ordered crystals and pores. The content, size, and distribution of pores have a significant impact on the performance of carbon fiber.

When the porosity is below a certain critical value, the porosity has no obvious effect on the interlaminar shear strength, flexural strength, and tensile strength of carbon fiber composites. Some studies indicate that the critical porosity causing a decrease in the mechanical properties of the material is 1%-4%. When the pore volume content is in the range of 0-4%, for every 1% increase in pore volume content, the interlaminar shear strength decreases by approximately 7%. Studies on carbon fiber epoxy resin and carbon fiber bismaleimide resin laminates show that when the porosity exceeds 0.9%, the interlaminar shear strength begins to decrease. Tests have shown that pores are mainly distributed between fiber bundles and at interlaminar interfaces. Moreover, the higher the pore content, the larger the pore size, which significantly reduces the area of the interlaminar interface in the laminate. When the material is stressed, it is prone to interlaminar failure, which is why the interlaminar shear strength is relatively sensitive to pores. In addition, pores are areas of stress concentration with weak load-bearing capacity. When stressed, pores expand to form long cracks, leading to damage.

Even two laminates with the same porosity (using different prepreg methods and manufacturing methods in the same curing cycle) exhibit completely different mechanical behaviors. The specific values of the decrease in mechanical properties with increasing porosity vary, showing that the impact of porosity on mechanical properties has large dispersion and poor repeatability. Due to the inclusion of many variable factors, the influence of pores on the mechanical properties of composite laminates is a complex issue. These factors include: the shape, size, and position of pores; the mechanical properties of fibers, matrix, and interfaces; and static or dynamic loads.

Compared with porosity and pore aspect ratio, pore size and distribution have a greater impact on mechanical properties. It has been found that large pores (area > 0.03mm²) have an adverse effect on mechanical properties, which is attributed to the influence of pores on crack propagation in the interlaminar resin-rich area.

Physical Properties

Carbon fiber combines the strong tensile strength of carbon materials and the soft processability of fibers, making it a new material with excellent mechanical properties. The tensile strength of carbon fiber is approximately 2 to 7 GPa, and the tensile modulus is about 200 to 700 GPa. The density is around 1.5 to 2.0 grams per cubic centimeter, which is related to the structure of the precursor fiber and mainly determined by the temperature of the carbonization treatment. Generally, after high-temperature graphitization treatment at 3000°C, the density can reach 2.0 grams per cubic centimeter. In addition, it is very light in weight, with a specific gravity lighter than aluminum, less than 1/4 that of steel, and a specific strength 20 times that of iron. The thermal expansion coefficient of carbon fiber is different from that of other fibers, and it has the characteristic of anisotropy. The specific heat capacity of carbon fiber is generally 7.12. The thermal conductivity decreases with increasing temperature; it is negative in the direction parallel to the fiber (0.72 to 0.90) and positive in the direction perpendicular to the fiber (32 to 22). The specific resistance of carbon fiber is related to the type of fiber. At 25°C, high-modulus carbon fiber has a specific resistance of 775, and high-strength carbon fiber has a specific resistance of 1500 per centimeter. This makes carbon fiber have the highest specific strength and specific modulus among all high-performance fibers. Compared with metal materials such as titanium, steel, and aluminum, carbon fiber has the characteristics of high strength, high modulus, low density, and small linear expansion coefficient in terms of physical properties, and can be called the "king of new materials".

In addition to having the characteristics of general carbon materials, carbon fiber has significant anisotropic flexibility in its shape and can be processed into various fabrics. Moreover, due to its low specific gravity, it exhibits high strength along the fiber axis direction. Carbon fiber-reinforced epoxy resin composites have the highest comprehensive index of specific strength and specific modulus among existing structural materials. The tensile strength of carbon fiber resin composites is generally above 3500 MPa, which is 7 to 9 times that of steel, and the tensile elastic modulus is 230 to 430 GPa, which is also higher than that of steel. Therefore, the specific strength of CFRP, i.e., the ratio of the material's strength to its density, can reach more than 2000 MPa, while the specific strength of A3 steel is only about 59 MPa, and its specific modulus is also higher than that of steel. Compared with traditional glass fiber, its Young's modulus (a physical quantity representing the tensile or compressive properties of a material within the elastic limit) is more than three times that of glass fiber; compared with Kevlar fiber, its Young's modulus is about twice that of Kevlar fiber. Tests on carbon fiber epoxy resin laminates show that as porosity increases, both strength and modulus decrease. Porosity has a significant impact on interlaminar shear strength, flexural strength, and flexural modulus; tensile strength decreases relatively slowly with increasing porosity; tensile modulus is less affected by porosity.

Carbon fiber also has excellent fineness (one of the expressions of fineness is the grams of 9000-meter-long fiber), generally only about 19 grams, and the tensile force is as high as 300 kg per micron. Few other materials have such a series of excellent properties as carbon fiber, so it is used in fields with strict requirements on toughness, stiffness, weight, and fatigue characteristics. When not in contact with air and oxidants, carbon fiber can withstand high temperatures above 3000 degrees, with outstanding heat resistance. Compared with other materials, the strength of carbon fiber starts to decrease only when the temperature is higher than 1500°C, and the higher the temperature, the greater the fiber strength. The radial strength of carbon fiber is not as good as its axial strength, so carbon fiber is sensitive to radial force (i.e., it cannot be knotted), while the whisker properties of other materials have already decreased significantly. In addition, carbon fiber also has good low-temperature resistance; for example, it does not become brittle at liquid nitrogen temperature.

The chemical properties of carbon fiber are similar to those of carbon. Except for being oxidized by strong oxidants, it is inert to general alkalis. When the temperature in the air is higher than 400°C, obvious oxidation occurs, generating CO and CO₂. Carbon fiber has good corrosion resistance to general organic solvents, acids, and alkalis, being insoluble and non-swelling, with excellent corrosion resistance, and there is no problem of rusting at all. Some scholars immersed PAN-based carbon fiber in a strong alkaline sodium hydroxide solution in 1981, and after more than 30 years, it still maintains its fiber form. However, its impact resistance is poor and it is easy to be damaged. It undergoes oxidation under the action of strong acids. The electromotive force of carbon fiber is positive, while that of aluminum alloy is negative. When carbon fiber composites are used in combination with aluminum alloys, metal carbonization, carburization, and electrochemical corrosion phenomena will occur. Therefore, carbon fiber must undergo surface treatment before use. Carbon fiber also has properties such as oil resistance, radiation resistance, radioresistance, absorption of toxic gases, and neutron moderation.

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