Zirconium Diboride ZrB2 Powder CAS 12045-64-6

About Zirconium Diboride ZrB2 Powder:

Zirconium boride is a chemical substance. The zirconium boride chemical formula is ZrB2. Nature gray hard crystals. Zirconium boride has three components: zirconium monoboride, zirconium diboride, and zirconium tribromide. Only zirconium diboride is stable in a wide temperature range. Industrial production is mainly based on zirconium diboride. Zirconium diboride is a hexagonal crystal, gray crystal, or powder with a relative density of 5.8 and a melting point of 3040°C. High-temperature resistance, high strength at room temperature, and high temperature. Good thermal shock resistance, low resistance, anti-oxidation at high temperature. The melting point is about 3000°C with a metallic luster.

Zirconium diboride ZrB2 is a highly covalent refractory ceramic material with a hexagonal crystal structure. ZrB2 is an ultra-high temperature ceramic (UHTC) with a melting point of 3246°C. Coupled with a lower density of ~6.09 g/cm3 (the measured density may be higher due to ha impurities) and good high-temperature strength, it is suitable for high-temperature aerospace applications, such as hypersonic flight or rocket propulsion systems, for example, Furnace components, high-temperature electrodes, rocket engines, thermal protection structures for spacecraft with temperature capabilities exceeding 1800°C, and heavy-wear applications.

It is an unusual ceramic with relatively high thermal and electrical conductivity and has the same characteristics as titanium diboride, which shares the same structure. In addition to its fire resistance, good thermal conductivity (>50 W/m/K), inertness to molten metal, good thermal shock resistance, and high electrical conductivity (~105 S/cm), ZrB2 can also pass EDM basic ceramic molding.

ZrB2 parts are usually hot-pressed (applying pressure to the heated powder) and then machined to form. The covalent nature of the material and the presence of surface oxides hinder the sintering of ZrB2. The presence of surface oxides will increase the coarsening of crystal grains before densification during the sintering process. Pressureless sintering of ZrB2 is possible. Sintering additives such as boron carbide and carbon will react with surface oxides, thereby increasing the driving force for sintering, but the mechanical properties will decrease compared to hot-pressed ZrB2.

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Features of Zirconium Diboride ZrB2 powder:

TiB2, ZrB2, HfB2, VB2, NbB, NbB2, TaB, TaB2, CrB2, Mo2B5, W2B5, Fe2B, FeB, CoB, Co2B, NiB, Ni2B, Ni2B, LaB6, UB4, UB2.

Zirconium diboride (ZrB2) is a highly covalent refractory ceramic material with a hexagonal crystal structure. ZrB2 is an ultra-high temperature ceramic (UHTC) with a melting point of 3246 °C. This, along with its relatively low density of ~6.09 g/cm3 (measured density may be higher due to hafnium impurities) and good high-temperature strength, makes it a candidate for high-temperature aerospace applications such as hypersonic flight or rocket propulsion systems. It is an unusual ceramic, having relatively high thermal and electrical conductivities, properties it shares with isostructural titanium diboride and hafnium diboride.

How is Zirconium Diboride ZrB2 Powder produced?

ZrO2 and HfO2 are reduced to their respective diboron silanes by metal thermal reduction. Use cheap precursor materials and react according to the following reactions:

ZrO 2 + B 2 O 3 + 5Mg→ZrB 2 + 5MgO

The precursor materials for this reaction (ZrO 2 / TiO 2 / HfO 2 and B 4 C) are cheaper than those required for stoichiometric and boron thermal reactions. Prepare ZrB2 at a temperature higher than 1600°C for at least 1 hour through the following reaction:

2ZrO 2 + B 4 C + 3C→2ZrB 2 + 4CO

This method requires a slight excess of boron because some boron is oxidized during the boron carbide reduction process. It is also observed that ZrC is the product of the reaction, but if the reaction is carried out under an excess of 20-25% of B4C, the ZrC phase disappears, and only ZrB2 remains. The lowest synthesis temperature (~1600°C) will produce UHTC with finer dimensions and better sinterability. Before boron carbide reduction, the boron carbide must be ground to promote the oxide reduction and diffusion process.

Before the reaction, ZrO2 and HfO2 can be dispersed on the boron carbide polymer precursor. In. Heating the reaction mixture to 1500°C results in the formation of boron carbide and carbon in situ and the subsequent reduction of ZrO2 to ZrB2.

The gas phase reduces the vapors of zirconium tetrachloride and boron trichloride when the substrate temperature is higher than 800°C. Recently, alternative ZrB2 films can also be prepared by physical vapor deposition.

Applications of Zirconium Diboride ZrB2 Powder:

Zirconium diboride has high hardness, high thermal conductivity, good oxidation resistance, and good corrosion resistance. Zirconium diboride is used in special ceramic refractory industries, the nuclear industry, the aerospace industry, and military industries. Zirconium diboride can be a surface coating for rolling balls and smooth solid materials.

Carbon fiber-reinforced zirconium diboride composites exhibit high density, while silicon carbide fiber-reinforced zirconium diboride composites are brittle and show catastrophic damage.

Zirconium diboride (ZrB2) can be used as thin-film electronic components for sensors, actuators, and micro-systems operating in high-temperature environments because it has metal-like conductivity and has a melting temperature of 3245°C.

Other applications of Zirconium Diboride ZrB2 Powder:

(1) zirconium diboride powder is used to produce materials for ceramics.

(2) zirconium diboride powder can be used as a neutron absorber.

(3) zirconium diboride powder can be used as an abrasion-resistant coating.

(4) zirconium diboride powder can be used as crucible lining and anticorrosive chemical equipment.

(5) zirconium diboride powder can be an anti-oxidation compound material.

(6) zirconium diboride powder can be used as a refractory material, especially in the anticorrosion of molten metals.

(7) zirconium diboride powder can be used as a thermally enhanced additive.

(8) zirconium diboride powder can be used for high-temperature resistance.

(9) zirconium diboride powder can be used as a special dope against high temperature, corrosion, and oxidation.