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How to prepare niobium boride?

wallpapers News 2021-05-08
NbB2 can be synthesized by a stoichiometric reaction between constituent elements (in this case, Nb and B). This reaction allows precise stoichiometric control of the material. Nb2O5 (or NbO2) can also be reduced to niobium diboride by metal thermal reduction. Use cheap precursor materials, and then react according to the following reactions:
Nb2O5 + 2 B2O3 + 11 Mg→2 NbB2 + 11 MgO
Magnesium is used as a reactant for acid leaching of undesirable oxide products. During the thermal reduction of metals, a stoichiometric excess of Mg and B2O3 is usually required to consume all available niobium oxide.
Jha and his colleagues proposed to reduce NbO2 and elemental boron through a solid-phase reaction to obtain nanorods (40×800 nm2).
. Produce nanocrystals (61 nm). Successfully synthesized NbB2 through Zoli reaction
Under 700°C argon flow, NabH4 and Nb2O5 with a molar ratio of M:B reduce the nanocrystals at a molar ratio of 1:4.
Nb2O5 + 13/2 NaBH 4→2 NbB2 + 4NA (G, L) + 5/2 NaBO2 + 13 H 2 (g)
Application of NbB2 powder
NbB2 is an ultra-high temperature ceramic (UHTC) with a melting point of 3050°C. Its relatively low density (approximately 6.97 g/cm3) and good high-temperature strength make it a candidate for high-temperature aerospace applications (such as hypersonic flight) or rocket propulsion systems. Ceramics have high thermal and electrical conductivity (resistivity of 25.7ΩYbcm, Cte of 7.7 Yb10 -6°C-1), and have the same
NboB2 has the same structure of titanium diboride, zirconium diboride, hydrogen diboride and tantalum diboride with the same properties. The parts are usually hot pressed or spark plasma sintered (applying mechanical pressure to the heated powder) and then processed into shapes. The covalent nature of NbB2 and the presence of surface oxides will hinder the sintering of NbB2, thereby making the particles coarser and then densified during the sintering process. By using sintering additives such as boron carbide and carbon, NbB 2 can be sintered without pressure. These sintering additives react with surface oxides to increase the sintering force, but the mechanical properties of NbB2 decrease compared with hot press sintering.

The price of NbB2 powder
The price of niobium boride NbB2 powder varies randomly with production costs, transportation costs, international conditions, exchange rates, and market supply and demand for niobium boride NbB2 powder. Tanki New Materials Co., Ltd. aims to help all industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for Niobium Boride NbB2 powder, please feel free to contact us for the latest price.

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