7704-99-6 Usage
Description
Zirconium Hydride (ZrH2) is a grayish-black, brittle metallic solid with a density of 5.6 g/cm3. It is stable in air and water, and its chemical properties are similar to those of titanium hydride. Zirconium Hydride contains 1.7-2.1% combined hydrogen, which can be driven off in a vacuum above 600°C. It is a gray-black metallic powder that is stable toward air and water, soluble in dilute hydrofluoric acid, and soluble in concentrated acids. This product has been enhanced for energy efficiency.
Uses
1. Used in Vacuum Tube Industry:
Zirconium Hydride is used as a getter in the manufacture of vacuum tubes and other systems for its ability to absorb gases and create a vacuum.
2. Used in Powder Metallurgy:
Zirconium Hydride is used as a hydrogen source for foaming metals and as a precursor in the reactive hot-pressing synthesis of Zr2SC ceramics by displacement reaction with the mixture of ZrC and ZrS2.
3. Used in Nuclear Industry:
Zirconium Hydride serves as a moderator in nuclear reactors due to its ability to slow down fast neutrons.
4. Used in Metal-Ceramic and Metal-Metal Bonding:
Zirconium Hydride is used for metal-ceramic and metal-metal bonding, facilitating the joining of different materials.
5. Used as a Hydrogen Reservoir:
Zirconium Hydride acts as a hydrogen reservoir and a source of pure hydrogen, making it useful in various hydrogenation applications.
6. Used in Hydrogenation Reactions:
Zirconium Hydride is used as a powerful reducing agent in acid solution or at high temperatures and as a hydrogenation catalyst.
7. Used in Hydrogen Storage:
Zirconium(II) hydride (ZrH2) can be used as a precursor for the synthesis of Mg-Zr hydrides by treating with MgH2 for hydrogen storage.
8. Used in the Preparation of Layer-Structured Materials:
Zirconium Hydride is used in the preparation of layer-structured β-zirconium nitride chloride (ZrNCl) by reacting with NH4Cl.
Preparation
Zirconium hydride may be prepared by heating zirconium oxide with magnesium in the presence of hydrogen: ZrO2 + 2Mg + H2 → ZrH2 + 2MgO Alternatively, hydride may be made by heating zirconium oxide with calcium hydride in the presence of hydrogenHydride also may be obtained by combining zirconium metal with hydrogen at elevated temperature.
Production Methods
Zirconium hydride in powder form was produced by the reduction of zirconium oxide with calcium hydride in a bomb reactor. However, the workup was hazardous and many fires and explosions occurred when the calcium oxide was dissolved with hydrochloric acid to recover the hydride powder. With the ready availability of zirconium metal via the Kroll process, zirconium hydride can be obtained by exothermic absorption of hydrogen by pure zirconium, usually highly porous sponge. The heat of formation is 167.4 J/mol (40 kcal/mol) hydrogen absorbed.
Hazard
Flammable, dangerous fire risk, especially
in the presence of oxidizers.
Flammability and Explosibility
Flammable
Safety Profile
A powerful reducing
agent. Flammable when dry or wet. Very
dangerous to handle; can explode.
Incandesces when heated in air. See also
HYDRIDES and ZIRCONIUM
COMPOUNDS.
Check Digit Verification of cas no
The CAS Registry Mumber 7704-99-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,0 and 4 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7704-99:
(6*7)+(5*7)+(4*0)+(3*4)+(2*9)+(1*9)=116
116 % 10 = 6
So 7704-99-6 is a valid CAS Registry Number.
InChI:InChI=1/Zr.4H/rH4Zr/h1H4