Aluminum oxide bulletproof ceramic high hardness and high density
bulletproof vest body protection
The application of alumina bulletproof ceramics
Aluminum oxide sintered products have a smooth surface, stable
size, and low price. According to purity, they are divided into
85/90/95/99 aluminum oxide ceramics, and their corresponding
hardness and price also increase sequentially. They can be seen in
various armored vehicles and military and police bulletproof suits.
However, in order to ensure a certain strength of the ceramics, 99
alumina ceramics are often used for bulletproof alumina ceramics,
and low porosity is ensured during the forming and sintering
processes to minimize micro stress concentration. Next, let's take
a look at its applications together.
Human body bulletproof vests are commonly used protective equipment
for individual soldiers, armed police, security personnel, and
armed escorts, and are dual-use products for both military and
civilian use. The core component of human body bulletproof vests is
the bulletproof insert plate. The insert plate material has gone
through hard metal insert plates and soft synthetic fiber insert
plates, and has now developed to the third generation of
ceramic/synthetic fiber composite insert plates, which is currently
the main development direction of bulletproof vests.
The bulletproof insert board is mainly divided into two parts. The
first is the insert board back board made of aramid or ultra-high
molecular weight high-strength high modulus polyethylene fiber
composite materials; The second is a bulletproof panel made from
aluminum oxide, silicon carbide, and boron carbide as raw
materials. The combination of the two is achieved through a
transitional bonding layer, and a layer of crack stopping cloth is
pasted on the surface of the ceramic panel to prevent damage to the
human body when the ceramic is broken, resulting in the
third-generation composite bulletproof insert plate.
As mentioned earlier, aluminum oxide has a high density and is
relatively heavy. In order to make bulletproof vests lighter and
more conducive to people's activities, processes such as injection
molding can be used to make aluminum oxide bulletproof ceramic
plates conform to the curve of the human body, while also reducing
the weight of the bulletproof ceramic plates, which is beneficial
for the human body to wear and more comfortable to wear.
Compared with the previous mainstream method of using small piece
splicing technology to paste ceramic tiles onto the ceramic insert
board manufactured on the back board, this curved alumina ceramic
board can avoid the defects caused by the elimination of splicing
joints in previous products, improve the bulletproof safety factor,
and at the same time, the uniformity of the internal material of
the ceramic tiles is also better.
products index:
| Ceramic characteristic table |
| | name | 99% ceramics | 95% ceramics |
| physical propertyessential component | essential component | AL2O3≥99% | AL2O3≥95% |
| Density(g/cm3) | 3.85 | 3.6 |
| water absorption% | 0 | 0 |
| sintering temperature | 1690 | 1670 |
| material characters | Hardness(HV) | 1700 | 1600 |
| break off strength | >6500 | >2900 |
| compressive strength | 30000 | 25000 |
| thermal response | maximum service tempera- ture | 1500 | 1400 |
| thermal expansion coefficient | 8 | 7.8 |
| 10-6/℃ |
| 0-1000℃ |
| Heat shock resistance T(℃) | 200 | 220 |
| thermal conductivity W/m.k | 31 | 22 |
| electrical specification | volume resistivity Ω.cm | >1012 | >1012 |
| Insulation destructive power KT/m | 18 | 16 |
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