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什么是碳纖維 What is carbon fiber
碳纖維是由碳元素組成的一種特種纖維，其含碳量隨種類不同而異，一般在90%以上。Carbon fiber is specially made of carbon elements. Its carbon content varies with different types, generally more than 90%.
Electrically and thermally conductive
Strong resistance to high temperature, abrasion and corrosion
Obvious anisotropy in appearance, soft, processable into various fabrics, and exhibit high strength along the fiber axis. Very high specific strength due to small specific gravity of carbon fiber.
It can be combined with resin, metal, ceramic and other substrates to make structural materials.
What is carbon fiber reinforced epoxy resin composite
Specific strength and specific modulus of carbon fiber reinforced epoxy resin composite is the highest among existing structural materials. In areas with strict requirements on density, stiffness, weight and fatigue performance, carbon fiber composite materials are quite advantageous in occasions that require high temperature and high chemical stability.
The composite material is composed of carbon fiber and epoxy resin. It has become an advanced aerospace material due to its small specific gravity, good rigidity and high strength. For every 1 kg reduction in the weight of a space vehicle, the launch vehicle can be reduced by 500 kg. Therefore, advanced composite materials are widely used in the aerospace industry.
Advantages of carbon fibers and carbon-fiber composite materials
High strength (5 times of steel)
Heat resistant (can withstand high temperatures above 2000°C)
Excellent thermal shock resistance
Low thermal expansion coefficient
Small heat capacity
Small specific gravity (1/5 of steel)
Excellent anti-corrosion and anti-radiation performance
Carbon fiber winding process
Carbon fiber winding is a continuous molding method of composite materials, which is to wind continuous fibers or fabrics impregnated with resin glue on a core mold according to a certain rule, and then solidify and demold into composite products.
Applicable products: carbon fiber and glass fiber composite products, such as circular pipes, pressure tanks, storage tanks and other rotationally symmetric products (reactors, large electronic stators, high-pressure gas cylinders, various insulating sleeves)
Features: Continuous molding process completed at one time; well guaranteed shape and size of the finished product, and high strength in diameter direction. However, relatively high production cost, specialized winding machines and auxiliary equipment are required.
Process classification (by different resin molding states)
Among all the processes, wet winding is the most common application. Dry winding is only applied in high-performance, high-precision and high-end aerospace technology.
碳纖維纏繞工藝原材料 Raw materials for carbon fiber winding process
Reinforcing material: fiber yarn
Resin matrix: colloidal material composed of resin and curing agent. Main resins include unsaturated polyester resin (civil pipes, tanks), epoxy resin (high compression and interlayer shear strength requirements), bismaleimide resin (aerospace products)
Filler: It can improve the performance of the resin matrix after being added. For example, it can achieve better abrasion resistance, higher flame retardancy and lower shrinkage.
碳纖維纏繞成型優點 Advantages of carbon fiber winding
High fiber strength: According to the force condition of the product, winding pattern can be designed to give full play to the strength of the fiber to achieve the best effect.
High specific strength: The weight of the fiber-wound pressure vessel is 40%-60% less than the steel vessel of the same volume and pressure.
High reliability: Easy to realize automation and mechanized production. After the process conditions are determined, the quality of the wrapped product is stable and accurate.
High production efficiency: automatic production, fast winding speed (240m/min)
Low cost: The same product can be equipped with several materials (including resin, fiber and lining) to make it recombined to achieve the best economic and technical effect.
碳纖維纏繞成型缺點 Disadvantages of carbon fiber winding
Winding process is not adaptable to arbitrary structure of products, especially the products with concave surface.
Require winding machine, mandrel, curing furnace, demoulding machine and skilled workers.
Nantong Synasia New Material Co., Ltd. has more than ten years of valuable experience specializing in the production of various specialty epoxy resins. In the next article, we will focus on introducing Synasia’s patented resin product S-186 which is perfectly suitable for carbon fiber winding application. Let's see you in the next article!
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