Lighter and stronger — Application of ceramic materials in bulletproof clothing-Bulletproof Alumina Ceramics

Lighter and stronger — Application of ceramic materials in bulletproof clothing-Bulletproof Alumina Ceramics

Bulletproof vests, also known as bulletproof vests, are used to protect the body from bullets or shrapnel. A bulletproof jacket mainly consists of a jacket and a bulletproof layer. The sheath is usually made of chemical fiber fabric, and the bulletproof layer is usually made of metal (special steel, aluminum alloy and titanium alloy), ceramic sheet (boron carbide, silicon carbide and aluminum oxide), FRP and UHMWPE fiber. Among them, the bulletproof layer can absorb the kinetic energy of the warhead or shrapnel, and has obvious protective effect on the low-speed warhead or manufactures bulletproof alumina ceramics

The hardness of the composite shells made by the good y2 company is higher than the hardness of the composite shells made by the good y2 company, which can be traced back to 196 mm. The hardness of the composite shell made by goody2 is the same as the hardness of the composite shell made by goody2, which can be used to simulate the high-speed shooting of the target, and the ceramic composite armor has been studied in depth. In 1965, Goodyear introduced boron carbide ballistic armor for military aircraft equipment. Since then, as a new type of bulletproof armor, ceramic materials have been gradually applied to military aircraft, tanks, ships and personal bulletproof vests.

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The biggest difference between ceramic materials and traditional metal materials in the principle of bulletproofing is that metal materials can absorb the energy of warheads through plastic deformation, while ceramics, as a brittle material, have almost zero plastic deformation. Therefore, under the action of the large impact force of the warhead, the ceramic material mainly absorbs energy through the micro-breaking process, which can be roughly divided into the initial impact stage, the erosion stage and the deformation fracture stage. The surface layer of bulletproof ceramic can passivate the warhead and shatter the surface into fine, hard particles. When the blunt bullet continues to penetrate, the bulletproof ceramic forms a fragmentation layer, the tensile stress inside the material destroys the ceramic, and the remaining energy is absorbed by the backing plate. Therefore, the greater the elastic modulus and hardness of the ceramic, the smaller the density, and the stronger the kinetic energy absorption capacity of the ceramic, that is, the better the anti-ballistic performance.

In addition to being easy to carry, bulletproof ceramics also have the characteristics of strong protection, which stems from the high specific strength, large elastic modulus and high hardness of the ceramic itself. In August 2005, a video of snipers attacking U.S. troops in Iraq circulated on the Internet. However, its content is more like an advertisement for the US military's "interceptor" bulletproof vest: the US medics who were attacked stood leisurely by the roadside. After a "bang", the bullet from the SVD sniper rifle instantly hit the chest of the Chinese medicine guard. The powerful impact made the latter soar and fall to the ground. But in the blink of an eye, the paramedic stood up again, looked in the direction of the attack with a gun, and ran to the back of the Humvee for cover... However, the paramedic was not intact. The powerful impact of the SVD warhead caused red bruises on his chest. According to the US military's evaluation of the "Interceptor" bulletproof vest, the vest itself has a bulletproof rating of Class I, which can resist 9mm pistol bullets. After inserting 1.81kg boron carbide small arms protection inserts on the front and back, the defense level can be increased to IIA level to resist the 7.62mm shells fired by the AK47. However, such plug-in boards are quite expensive. Fully equipped "Interceptor" bulletproof vests total up to $1,600.

The bulletproof vest can prevent bullets from penetrating the human body, but it cannot prevent "blunt trauma", that is, when the bullet cannot penetrate the human body, the huge impact kinetic energy can still cause the human body to form injuries similar to those caused by blunt blows, which may seriously damage the internal organs and bones of the human body . At this time, the ceramic material can absorb kinetic energy through fracture, so the protection performance will be better than that of plastic materials such as metal. At present, the ceramic materials that have been used in bulletproof clothing are mainly alumina, silicon carbide and boron carbide. manufactures bulletproof alumina ceramics

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