Bulleproof Armor

Alumina armor ceramics

Alumina armor ceramics Description: Among bulletproof armor materials, inorganic non-metallic ceramic materials have the characteristics of low density, high hardness and high strength, and have been widely concerned and used. At present, t

Bulletproof level:


Origin:Changsha China

Categories:Bulleproof Armor



Alumina armor ceramics

Description: Among bulletproof armor materials, inorganic non-metallic ceramic materials have the characteristics of low density, high hardness and high strength, and have been widely concerned and used. At present, there are many ceramics that can be used for bulletproof armor, including alumina, silicon carbide, boron carbide, silicon nitride and so on. Among them, alumina ceramics, silicon carbide ceramics and boron carbide ceramics are widely used, and have become representatives of low-end, mid-end and high-end ceramics, respectively. In general, the advantages of alumina as armor ceramics are getting stronger and stronger. At present, the specification requirements of armor ceramics are getting larger and larger, and the technology is becoming more and more mature, and the technology, press and kiln for the production of bulk alumina on the market can support our production of qualified 500*500 aluminum oxide whole plates, and are widely used in the field of bulletproof armor for the protection of vehicles, aircraft and personal safety.

I.Sintering method

The technology method of densifying granular ceramic body and forming solid materials is called sintering. Sintering is to remove the void between the particles in the body, by removing a small amount of gas and impurities and organic matter, so that the particles grow and combine with each other to form a new material method. The most widely used sintering heating device is the electric furnace, which is usually called atmospheric pressure sintering or non-pressure sintering.

II. Physical properties

Alumina ceramics is the first large-scale production of bulletproof ceramics, which is the hardest oxide ceramics, and density is also small. And the weight is 40% lighter than the  armor possessing same bulletproof ability. Another feature of alumina ceramics is its low price, so it is widely used in a variety of armored vehicles and bulletproof clothing. However, with the continuous improvement of the kinetic energy of various bullets, the bulletproof performance of alumina needs to be stronger. Because the greater the hardness of the ceramic, the easier it is to break and absorb more energy when impacted by the projectile, while making the projectile deformed or broken. The toughness of ceramics also has an impact on bulletproof properties. The improvement of toughness can delay the development of ceramic cracks, increase the friction and wear of the projectile, and further aggravate its energy dissipation. The formula of Kingcera brand to improve the toughness of alumina is currently favored by more customers.
The higher the purity of alumina ceramics, the higher the hardness. Secondly, it also has high wear resistance, high melting point, excellent insulation properties and various chemical stability. It is widely used in aerospace, automotive, energy, chemical and other fields. Because it has excellent mechanical properties, high hardness, strong wear resistance, good stability, small thermal expansion coefficient, good energy absorption, alumina ceramics is favored by military experts in various countries, and is widely used.

III.Bulletproof mechanism

The reason why ceramics can be bulletproof is because of its high hardness, high strength and chemical inertness in many environments. It is superior to metal, which produces plastic deformation and absorbs energy when resisting the impact of the bullet, while ceramic produces little plastic deformation, and the bullet will be blunted or even broken due to its own high strength and hardness characteristics.
When the high-speed projectile body collides with the ceramic layer, the ceramic layer breaks or cracks and diffuses around the impact point to consume most of the energy of the projectile body, and then the high modulus fiber composite plate further consumes the remaining energy of the projectile body. Therefore, the application of alumina ceramics in the armor system is very attractive, and has become a widely used in body armor, vehicles, aircraft and other equipment protective armor.

IV.Product structure

The molecular formula of alumina ₃ is Al₂O₃, and it has many homogeneous crystals. There are three main crystals, namely α-Al₂O₃, β-Al₂O₃, gamma-Al ₂O₃, which are different in structure and nature. Among them, the structure of α-Al₂O₃ is the most stable, also known as corundum, at high temperatures above 1300℃, Al₂O₃ is almost completely transformed into α-Al₂O₃, becoming the main component of alumina bulletproof ceramics.
Kingcera special porcelain production of alumina bulletproof armor ceramics, has alumina content of 99% and 95% two labels, Rockwell hardness up to HRA85-88. Through the military unit shooting test, the bullet impact resistance is strong, the depression value is low, the absorption capacity is strong, the effect is good.

V. Armor ceramic application test

Alumina bulletproof armor is used for the protection of military equipment such as tanks, armored vehicles, combat aircraft, and can also be applied to personal protective equipment, such as shrapnel protective clothing. It can also be used in the field of civil building safety, such as bank safes, security doors and building protection. It can effectively withstand the attack of high-speed shrapnel and artillery shells, and provide a safe and protective environment.
Kingcera 99/95 alumina bulletproof ceramic insert plate shooting test record

Ⅵ. Kingcera 99/95 alumina ceramic bulletprrof sheet index parameters

Parameter Unit 99 Al₂O₃ K95 Al₂O₃ K95E Al₂O₃
Alumina content % ≥99 ≥95 <95
Bulk density g/cm³ ≥3.8 ≥3.8 ≥3.75
Rockwell hardness HRA ≥88 ≥85 ≥85
Vicker hardness Hv10 ≥1500 ≥1300 -
Wear volumn cm³ ≤0.02 - -
Bending strength Mpa ≥320 ≥320 ≥300
Compressive strength Mpa ≥1300 ≥1250 ≥1250
Fracture toughness KIC (Mpa.m1/2) ≥4.0 ≥3.5 ≥3.4
Thermal conductivity W/m.K 20 20 20
Thermal expansion coefficient m/m.K 7.2×10-6 7.2×10-6 7.2×10-6
With the continuous progress of science and technology, the performance of aluminum oxide bulletproof armor will be further improved. The preparation process of aluminum oxide bulletproof armor has been improved, and the production efficiency and quality stability of aluminum oxide armor are better, which can provide people with a higher level of security.

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