High purity Niobium Silicide particles NbSi2

English name :niobium disilicide

CAS:12034-80-9

EINECS:234-812-3

Molecular formula :NbSi2

Molecular weight :149.0774

Melting point :1940℃

Properties: gray hexagonal crystal. The relative density is 5.7. Lattice constant port 1 0.4863 nm, C= 0.6604 nm. Melting point 1950℃, microhardness 10.3 GPa(1050kg/mm2), Vickers hardness 5.88 ~ 6.88GPa (600 ~ 700kg/mm2), electrical conductivity 50.4×10-4 S/m, coefficient of thermal expansion 7.3×10-6. ° C _1. Insoluble in water, concentrated hydrochloric acid, concentrated sulfuric acid, soluble in hydrofluoric acid and sulfuric acid mixed solution.

1. Niobium silicide composites Binary alloy matrix composites are promising high-temperature structural materials, in which solid solution niobium provides room temperature toughness and Si2Nb provides high temperature strength. This composite material has high thermodynamic stability and microstructure stability at high temperatures.

2. Nbsi2-based superalloy has high melting point, low density and excellent overall performance, and its target temperature is 200 ~ 300℃ higher than that of Ni-based superalloy, which is expected to be applied to gas turbine engine blades working at 1300 ~ 1500℃ and hot end parts of space aircraft ramjet engines.

3. The research and development idea of NBSi2-based superalloy is mainly to form niobium based solid solution /Nb5Si3 biphase composite material by adding a ductile solid solution phase, which can improve its room temperature toughness while maintaining excellent high temperature strength

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