Synthesis and material properties of polymer-derived niobium carbide and niobium nitride nanocrystalline ceramics
Ceramics International, ISSN: 0272-8842, Vol: 47, Issue: 1, Page: 1163-1168
2021
- 12Citations
- 21Captures
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Article Description
Nanocrystalline niobium carbide (NbC) ceramics and niobium carbide-niobium nitride (NbC/NbN) composites were synthesized at low temperatures without high-pressure sintering using a single-step polymer-derived approach from a meltable pre-ceramic blend. Niobium hydride (NbH 5 ) and 1,2,4,5-tetrakis(phenylethynyl)benzene (TPEB) reacted at 1500 °C under argon or nitrogen in a tube furnace to form NbC or NbC/NbN with high purities and nanosized grains. Superconductivity measurements indicated that NbC/NbN ceramics exhibited a mixed phase system with two distinct T c values, and higher elemental niobium content within solids yielded lower T c. The resulting ceramic monoliths exhibited homogeneous morphologies and controllable amounts of free carbon in the composite matrix. Niobium carbide and nitride composites demonstrated good air oxidation stability up to 450 °C.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0272884220326122; http://dx.doi.org/10.1016/j.ceramint.2020.08.232; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85090127395&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0272884220326122; https://dx.doi.org/10.1016/j.ceramint.2020.08.232
Elsevier BV
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