History
The earliest known composite armour for armoured vehicles was developed as part of the US Army's T95 experimental series from the mid-1950s. The T95 featured "siliceous-cored armor" which contained a plate of fused silica glass between rolled steel plates. The stopping power of glass exceeds that of armour steel on a thickness basis and in many cases glass is more than twice as good as steel on a thickness basis. Although the T95 never entered production, a number of its concepts were used on the M60 Patton, and during the development stage (as the XM60) the siliceous-cored armour was at least considered for use, although it was not a feature of the production vehicles.
The first widespread use of a composite armour appears to have been on the Soviet T-64. It used an armour known as Combination K, which apparently is glass-reinforced plastic sandwiched between inner and outer steel layers. Through a mechanism called thixotropy, the resin changes to a fluid under constant pressure, allowing the armour to be moulded into curved shapes. Later models of the T-64, along with newer designs, used a boron carbide-filled resin aggregate for greatly improved protection. However the quality of the tanks produced during this era varied widely; if the boron carbide was not available in time to meet production quotas, the tank would be shipped with any filler that could be found, and sometimes nothing at all. In order to deal with these problems, the Soviets invested heavily in reactive armour, which allowed them some ability to control quality, even after production.
The most common type of composite armour today is Chobham armour, first developed and used by the British in the experimental FV 4211 tank, which was based on Chieftain tank components. Chobham sandwiches a layer of ceramic between two plates of steel armour, which was shown to dramatically increase the resistance to HEAT rounds, even in comparison to other composite armour designs. Chobham was such an improvement that it was soon used on the new U.S. M1 Abrams main battle tank (MBT) as well. It is the fabrication of the ceramic in large tiles that gives the Challenger and Abrams their "slab sided" look.
Read more about this topic: Composite Armour
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