Physical and chemical properties of niobium carbide

Release time:

2021-07-09

Is insoluble in hot and cold hydrochloric acid, sulfuric acid, nitric acid, but soluble in a mixed solution of hot hydrofluoric acid and nitric acid. It is stable at 1000~1100℃, and rapidly oxidized to niobium pentoxide above 1100℃. Niobium carbide is easy to melt in titanium carbide, zirconium carbide, tungsten carbide and other compounds, and together form isomorphous solid solution mixtures. Melting point: 3500℃, density: 7.6g/cm³(25℃)

Niobium carbide is a green cubic crystal with metallic luster and belongs to the sodium chloride type cubic crystal system.

Relative density is 8.47, lattice constant a=0.447nm,

Melting point is 3500°C. The microhardness is >23.5 Gpa (>2400 kg/mm2), which is harder than corundum. Elastic modulus 338000 N/mm2, thermal expansion coefficient 6.65×10^(-6)/K, thermal conductivity 14 w/(m·K), heat generation -140.7 kJ/mol, specific heat capacity 36.8 J/(mol·K) , Resistivity 35μΩ·cm.

Is insoluble in hot and cold hydrochloric acid, sulfuric acid, nitric acid, but soluble in a mixed solution of hot hydrofluoric acid and nitric acid. It is stable at 1000~1100℃, and rapidly oxidized to niobium pentoxide above 1100℃. Niobium carbide is easy to melt in titanium carbide, zirconium carbide, tungsten carbide and other compounds, and together form isomorphous solid solution mixtures. Melting point: 3500℃, density: 7.6g/cm³(25℃)