Bullet proof ceramic plate introduction

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The relationship between the body armor and the gun is like the spear and the shield forever entangle not clear, and about the body armor now has too many misunderstanding and misinterpretation, today will discuss the body armor accessory “insert board”.
A brief history of bulletproof ceramics

The use of ceramic armour dates back to 1918, after the end of the first world war, when colonel nevel Monroe Hopkins discovered in experiments that coating steel armour with ceramic glaze greatly enhanced its protection.Although the properties of ceramic materials were discovered very early, their actual use in military applications was not long established.The first country to make widespread use of ceramic armor was the former Soviet union, and the U.S. military also made extensive use of it during the Vietnam war.However, due to early cost and technical problems, ceramic armor has only emerged as protective equipment for individual soldiers in recent years.

In fact, the United Kingdom in 1980 on the use of alumina ceramic body armor, the United States army in the 1990s mass production of the first real sense of the “plug board” SAPI.When it can be said to be a revolutionary protective gear, its NIJ Ⅲ level protection standards, the bullet can threat to intercept the vast majority of infantry, where the U.S. is still not satisfied, so the ESAPI was born.

The ESAPI the protective effect of black technology is used to describe the absolute not too, NIJ level Ⅳ protection standards make it cut a swath, also saved many soldiers’ lives.A lot of people probably don’t pay attention to how this thing works.

Structure

To understand the protection principle of ESAPI, we have to understand its structure first. Most composite ceramic armor structures are structural ceramic target surface + metal/non-metal back target, and the ESAPI of the us military also adopts this structure.

The ESAPI of the us army did not use useful and “economical” silicon carbide ceramics, but used the more expensive boron carbide ceramics, and the us army used uhmw-pe on the back target. At the same time, the price of this material was also surprisingly high, and the price of early uhmw-pe even exceeded that of boron carbide ceramics.

Types of bulletproof ceramics:

Bullet-proof ceramics, also known as structural ceramics, have the characteristics of high hardness and high modulus, and are usually used for metal abrasion, such as grinding ceramic balls, ceramic milling pin head……A class of engineering applications and in composite armor ceramics often play the role of “warhead breaking” the variety of the most commonly used in body armor are alumina ceramics (AI O), silicon carbide ceramics (SiC), boron carbide ceramics (B4C).

Its respective characteristic is: alumina ceramics density is highest, but the hardness is relatively low, the processing threshold is lower, the price is cheaper.More different purity of the industry is divided into -85/90/95/99 alumina ceramics, the higher the label indicates the higher the purity, hardness and price

Silicon carbide density is moderate, the same hardness is also relatively moderate, belongs to the structure of high cost performance of ceramics, so most of the domestic body armor insert board will use silicon carbide ceramics.

Among these ceramics, boron carbide ceramics have the lowest density and the highest strength. At the same time, it also has high requirements on processing technology, requiring high temperature and high pressure sintering. Therefore, its price is also the most expensive among several kinds of ceramics.

Level to NIJ Ⅲ plate as an example, although the weight of alumina ceramic board than silicon carbide ceramic board 200 g ~ 300 g, than boron carbide ceramic board 400 g ~ 500 g.However, the price is indeed 1/2 of the silicon carbide ceramic insert board and 1/6 of the boron carbide ceramic insert board, so currently the alumina ceramic insert board has the highest cost performance and belongs to the leading products in the market.

Three kinds of bulletproof ceramic sintering process is one of the most important core elements.Alumina ceramics can be sintered in SIMUWU high temperature vacuum degreasing furnace with nitrogen and argon under normal pressure.Silicon carbide is made of high density ceramics by vacuum degreasing sintering furnace at 2400℃.There are two different sintering processes for boron carbide fired ceramics.One is the reaction sintering method of silicon nitride by metal silicon infiltration, and the other is the vacuum hot pressing sintering method.Different sintering methods were completed by vacuum reaction sintering furnace and vacuum hot pressing sintering furnace respectively.

SIMUWU vacuum furnace can provide different furnace shapes for different sintering techniques.Customized according to different production requirements.
Has the high intelligence, the super stability work characteristic.

Edited by: Lucky Hu
Copyright: SIMUWU Vacuum Furnace

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