CAS:12007-23-7 | Hafnium Boride

Description

Hafnium diboride（CAS:12007-23-7） is an ultrahigh temperature ceramic composed of hafnium and boron. It has a melting temperature of about 3250 degrees Celsius. It is an unusual ceramic, having relatively high thermal and electrical conductivities, properties it shares with isostructural titanium diboride and zirconium diboride. It is a grey, metallic looking material. Hafnium diboride has a hexagonal crystal structure, a molar mass of 200.11 grams per mole, and a density of 10.5 grams per cubic centimeter.

Hafnium diboride（CAS:12007-23-7） is often combined with carbon, boron, silicon, silicon carbide, and/or nickel to improve the consolidation of the hafnium diboride powder (sintering). It is commonly formed into a solid by a process called hot pressing, where the powders are pressed together using both heat and pressure.

The material has potential for use in hypervelocity reentry vehicles such as ICBM heat shields or aerodynamic leading-edges, due to its strength and thermal properties. Unlike polymer and composite material, HfB2 can be formed into aerodynamic shapes that will not ablate during reentry.

Hafnium diboride（CAS:12007-23-7） is also investigated as a possible new material for nuclear reactor control rods. It is also being investigated as a microchip diffusion barrier. If synthesized correctly, the barrier can be less than 7nm thick.

Name:Hafnium boride

CAS:12007-23-7

Purity:99%

Molecular Formula:B₂Hf

Molecular Weight:204.14

Melting Point:3250ºC

Boiling Point:N/A

Density:11.19 g/cm³

PSA:0.00

LogP:-1.83

Appearance:Solid

Water solubility:Insoluble

Storage condition:Store at room temperature

Application:Hafnium boride（CAS:12007-23-7） is used in wear resistant coatings. It is also employed as a nuclear reactor control rod. Furthermore, it is used in hypervelocity re-entry vehicles like ICBM heat shields or aerodynamic leading-edges. It is useful in the preparation of high temperature composites in conjunction with silicon carbide (SiC).

Reference: 

Pan, Y.; Huang, H.; Wang, X.; Lin, Y. Phase stability and mechanical properties of hafnium borides: A first-principles study. Comput. Mater. Sci. 2015, 109, 1-6.

Winder, S. L.; Ruggles-Wrenn, M. B.; Parthasarathy, T.; Key, T.; Carney, C. M. Thermo-chemical compatibility of hafnium diboride with yttrium aluminum garnet at 1500°C in air. J. Eur. Ceram. Soc. 2015, 35 (9), 2437-2444.

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