Hafnium boride This is a gray-colored crystal with metallic luster. It exhibits high conductivity and is stable in chemical properties. It is indistinguishable from all other chemical reagents at room temperature, with the exception of hydrofluoric acids. It can be prepared by heating hafnium oxide or boron carbonide with carbon powder or by reducing hafnium titanate and boron trichloride under hydrogen at 2000. Or by directly reacting hafnium or boron. It is used to make superalloys.
Hafnium Diboride is known for its high melting point, high hardness and excellent electrical and thermal conductivity. It also has good neutron absorption properties. It can be used to make electrode materials, super-hard materials and neutron absorption substances, as well as ultra-high-temperature materials.
The applications of hafnium dioxide ceramics and composite materials have expanded with the advent of material technology. At home and abroad, it is a major R&D priority to find low-cost, high-quality hafnium dioxide powder. Hafnium Diboride is hard to sinter. To improve the sintering performance it is important to obtain ultrafine powder. While nano-powder offers superior performance, it is costly and difficult to disperse during raw materials processing. The development of submicron hafnium triboride powder has been gaining increasing attention.
Hafnium Diboride in wear-resistant coats Because of its exceptional fire resistance, it can also be used in ultra high temperature composite materials (SiC) with silicon carbide. This material is more resistant to oxidation when it has been combined with silicon carbide.
The temperature and pressure determine the resistance to oxidation of hafnium dioxide. At 1500 degrees Celsius and 1 atmosphere pressure, a protective oxide of hafniumoxide is formed. HfB2’s oxidation resistance will decrease significantly if it is heated above 1600C or the pressure drops below one atm. These conditions will cause the boiling temperature for B2O3 (another oxidation product of HfB2) to exceed 1400°C. A protective oxide layer will then form.
Because of its strength and thermal characteristics, HfB2 can be used in ultra high-speed reentry vehicle, such as heat shields, for intercontinental ballistic missiles, or aerodynamic fronts. HfB2 forms aerodynamic shapes unlike composite and polymers, and does not ablate during reentry.
Hafnium Diboride has been also investigated as a possibility for new materials in nuclear reactor control rods.
Hafnium-diboride is being investigated as a diffusion barrier for microchips. If the synthesis is correct the barrier thickness could be less than 7 nanometers.
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