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Boron Carbide Ceramics and Shock Induced Localized Amorphization

Posted on 2023-05-17

boron carbide ceramics are one of the most widely used engineering ceramics due to its excellent properties including low specific weight, chemical inertness and high hardness. These qualities have made B4C a valuable material in a variety of applications, including aerospace, nuclear and military applications.

boron carbide is a non-oxide ceramic with a rhombohedral crystal structure and a Mohs hardness of about 9.49, which is the third hardest material after diamond and cubic boron nitride. Its high hardness makes it an ideal material for wear-resistant parts and abrasives, such as blasting nozzles, in the oil and gas industry.

B4C can be formulated into a wide range of different products and materials, such as powders, pastes, fibers, mesoporous ceramics and microspheres. Several sintering methods and sintering additives are also available for boron carbide to promote the densification of the product.

Shock induced localized amorphization (SILA) in boron carbide has been observed to occur when the material is subjected to large shocks and pressures. This is a precursory failure mechanism in which the crystal symmetry breaks down and the crystal fragments become disordered.

This process can be accelerated through thermal shock. The thermal shock can cause the boron carbide to melt. This is an important consideration because it can lead to catastrophic fracture of the material.

The current study investigated the shock-induced localized amorphization of boron carbide ceramic targets under high pressure and temperature conditions. Using the ANSYS software, the dynamic behavior of the material was investigated in order to identify the mechanisms responsible for this phenomenon. The boron carbide ceramic target was first optimized using the conjugate gradient algorithm to ensure that the atomic positions and cell parameters were properly balanced.

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