Ultra High Temperature Ceramic Composites

In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

“…Due to the combination of the excellent properties of NbB 2 and NbC, fine and homogeneous microstructures of these ceramics can be a potential precursor powder for the development of NbB 2 -based dense bodies. Furthermore, the existence of carbides in the boride matrix drives the formation of a protective layer during oxidation and enhances the oxidation resistance of borides at high temperatures [35]. This is significant for high-temperature structural applications of the composites, where oxidation resistance is highly demanded [35].…”

“…Furthermore, the existence of carbides in the boride matrix drives the formation of a protective layer during oxidation and enhances the oxidation resistance of borides at high temperatures [35]. This is significant for high-temperature structural applications of the composites, where oxidation resistance is highly demanded [35]. Moreover, it is well known that in situ techniques involve chemical reactions that result in the formation of new phases, and this provides a strong matrix reinforcement bond that is not easy to obtain in ex situ processes [36].…”

Mechanochemical synthesis of Ti1−xZrxB2 and Ti1−xHfxB2 solid solutions

“…Group IVB diborides are currently employed in specialised applications, such as impact resistant armours, cutting tools, wear resistant coatings, molten metal crucibles, high temperature electrodes, and refractories for high-temperature manufacturing processes. Group IVB diborides are also potential candidates for the development of materials that can withstand ultra-high temperatures and extreme environments [2][3][4].…”

Preparation of B4C-ZrB2-SiC eutectic ceramics by arc melting method

“…As abrasive materials, B 4 C-SiC [7], TiB 2 -B 4 C [8,9] eutectic ceramics have been fabricated. ZrB 2 -SiC ceramics [10,11], as ultra-high temperature ceramics, have been widely investigated in the world. Two eutectic compositions, ZrB 2 -77.4mol.%SiC and ZrB 2 -58.5mol.%SiC [12], have been reported.…”