Ultra-high temperature ceramic

Ultra-high-temperature ceramics (UHTCs) are a type of refractory ceramics that can withstand extremely high temperatures without degrading, often above 2,000 °C.[1] They also often have high thermal conductivities and are highly resistant to thermal shock, meaning they can withstand sudden and extreme changes in temperature without cracking or breaking. Chemically, they are usually borides, carbides, nitrides, and oxides of early transition metals.[2][3]

UHTCs are used in various high-temperature applications, such as heat shields for spacecraft, furnace linings, hypersonic aircraft components and nuclear reactor components. They can be fabricated through various methods, including hot pressing, spark plasma sintering, and chemical vapor deposition. Despite their advantages, UHTCs also have some limitations, such as their brittleness and difficulty in machining. However, ongoing research is focused on improving the processing techniques and mechanical properties of UHTCs.

  1. ^ Wuchina, E.; et al. (2007). "UHTCs: ultra-high temperature ceramic materials for extreme environment applications". The Electrochemical Society Interface. 16 (4): 30–36. doi:10.1149/2.F04074IF.
  2. ^ Zhang, Guo-Jun; et al. (2009). "Ultrahigh temperature ceramics (UHTCs) based on ZrB2 and HfB2 systems: Powder synthesis, densification and mechanical properties". Journal of Physics: Conference Series. 176 (1): 012041. Bibcode:2009JPhCS.176a2041Z. doi:10.1088/1742-6596/176/1/012041.
  3. ^ Lawson, John W., Murray S. Daw, and Charles W. Bauschlicher (2011). "Lattice thermal conductivity of ultra high temperature ceramics ZrB2 and HfB2 from atomistic simulations". Journal of Applied Physics. 110 (8): 083507–083507–4. Bibcode:2011JAP...110h3507L. doi:10.1063/1.3647754. hdl:2060/20110015597. S2CID 121755388.{{cite journal}}: CS1 maint: multiple names: authors list (link)