It is widely used in many fields such as aerospace, automobiles, electromechanical, construction, and sports in my country, and is one of the indispensable materials in future life.
Aviation sector
Aramid fiber has low density, high strength, and good corrosion resistance. It can be used to manufacture missile rocket engine casings, broadband wave-transmitting materials for aircraft and spacecraft fuselages, main wings, tails, etc., and structural components that can withstand impact forces. The multi-layer honeycomb structure board prepared by impregnating aramid cloth with epoxy resin to form aramid prepreg and directly bonding it with the honeycomb or foam structure has outstanding impact resistance and electromagnetic wave permeability. The super-hybrid composite laminate formed by overlapping aramid, thin aluminum plates, and epoxy weft-free fabrics and hot-pressing them has extremely high specific modulus and specific strength, and its fatigue life is 100 to 1,000 times that of aluminum alloy plates. Can be used on aircraft fuselages and other parts. Resin-based reinforced composite materials prepared from aramid fibers are used in aircraft bodies, which can greatly reduce the total weight of the aircraft.
Military field
With the development of new military weapons such as chemical and nuclear weapons, there are more new requirements for the performance of military protective clothing: durability, lightness, bulletproof, flame retardant, good environmental adaptability and camouflage, etc. Bulletproof vests and bulletproof helmets made of aramid fiber can replace old nylon vests and tank-type steel helmets. Adding an appropriate amount of aramid to bulletproof vests and helmets can not only make them small in size and light in weight, but also increase their bulletproof performance by 40%. . Soft bulletproof vests made of high-grade bulletproof aramid weft-free fabric and high-performance polyethylene film have better bulletproof performance and heat resistance than ultra-high molecular weight polyethylene fiber. Aramid fiber can also be compounded with other materials (such as metals, ceramics, etc.) to make various high-strength, impact-resistant explosion-proof cans, bulletproof shields, and bulletproof armor plates. In addition, bonding aramid fiber fabric to the inner wall of the structure can effectively absorb explosion waves and prevent shrapnel damage to the human body.
Construction sector
The ductility of aramid fiber fabric is better than that of carbon fiber. The material itself is light in weight and flexible in freedom. It is an ideal reinforcement material for construction projects, especially when reinforcing irregularly shaped components. Due to its good softness, it is easy to use when reinforcing edges and corners. There is no need to chamfer. Weaving aramid fibers into steel bars can be used as cement-reinforced frameworks for large buildings. In addition to its advantages of high strength and light weight, it is also corrosion-resistant and has good shear resistance.
Transportation field
Because aramid fiber has low density, can withstand high and low temperatures, and has good adhesion to rubber, it can be used as tire cord for automobiles or aircraft. Tires made of aramid fiber have light weight, thin tires, low rolling resistance, high tire load-bearing capacity, good wear resistance, cut resistance and puncture resistance, and the center of gravity of the ground pressure during tire use It has small movement, good steering performance, easy heat dissipation, and is not easy to deform, which improves the ride comfort of the car, extends the service life of the tire, and can meet the tire usage requirements of modern supersonic aircraft.
Electronic and electrical fields
Aramid fiber has high strength and modulus, low dielectric coefficient, and good electromagnetic wave transmittance. Under the same stiffness conditions, the thickness of radar antenna shields made of aramid composite materials can be reduced by 30% compared with glass fiber composite materials. %, the electromagnetic wave transmittance is increased by 10%; the laminated substrate made of aramid and epoxy, phenolic, polyimide and other resins has a high linear expansion coefficient matching with ceramics, and does not expand under the action of thermal expansion and contraction. It will cause cracking and can be used to make special printed circuit boards in surface mounting technology, which is beneficial to the miniaturization and lightweight of electronic equipment.
Utilizing the characteristics of high strength and high temperature resistance of aramid fiber, it is used as a "tension member" in the optical fiber to protect the small and fragile optical fiber from elongation and deformation when subjected to tensile force, and will not affect the transmission of light. Composite products of aramid fiber and carbon fiber have good processability and semiconducting properties, and can withstand high temperatures. They are often used to make materials for reducing electric fields in high-voltage devices. After being impregnated with insulating paint, aramid paper has good insulation properties and is combined with natural mica sheets to be used as insulation material for heat-resistant motors.
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