7704-98-5

Basic information

• Product Name: TITANIUM HYDRIDE
• Synonyms: TiH2;Titanium hydride (TiH2);titaniumdihydride;titaniumhydride(tih2);TITANIUM(+2)HYDRIDE;TITANIUM HYDRIDE;TITANIUM(II) HYDRIDE;Titaniumhydridemeshgraypowder
• CAS NO: 7704-98-5
• Molecular Formula: H₂Ti
• Molecular Weight: 49.88
• EINECS: 231-726-8
• Product Categories: Materials for Hydrogen Storage;Metal Hydrides;Metal HydridesAlternative Energy;Reduction;Synthetic Reagents;Catalysis and Inorganic Chemistry;Metal HydridesChemical Synthesis;Titanium;metal hydrides;Alternative Energy;Chemical Synthesis;Materials for Hydrogen Storage;Materials Science;Synthetic Reagents
• Mol File: 7704-98-5.mol
• Article Data: 1

Chemical Properties

• Melting Point: 225°C
• Flash Point: >400°C
• Appearance: Gray to black/Powder
• Density: 3.91
• Storage Temp.: Flammables area
• Water Solubility: Soluble in water.
• Sensitive: Moisture Sensitive
• Merck: 14,9473
• CAS DataBase Reference: TITANIUM HYDRIDE(CAS DataBase Reference)
• NIST Chemistry Reference: TITANIUM HYDRIDE(7704-98-5)
• EPA Substance Registry System: TITANIUM HYDRIDE(7704-98-5)

Safety Data

• Hazard Codes: F
• Statements: 15-11
• Safety Statements: 7/8-43A-24/25-36/37/39-33-16-43
• RIDADR: 1871
• WGK Germany: 3
• RTECS: XR2130000
• TSCA: Yes
• HazardClass: 4.1
• PackingGroup: II
• Hazardous Substances Data: 7704-98-5(Hazardous Substances Data)

Usage

Description

Titanium hydride, also known as Titanium(II) hydride, is a brittle, metallic-gray solid with a density of 3.8 g/cm3. It is stable at room temperature, inert to water and most chemical reagents, and insoluble in water. Titanium hydride produces 448 mL of hydrogen gas at standard temperature and pressure per gram of TiH2. It decomposes at 450°C with the evolution of hydrogen and may ignite and burn with an intense flame if exposed to high temperatures or flame.

Uses

Used in Powder Metallurgy:
Titanium hydride is used as an additive in the manufacturing of Alnico sintered magnets and in sintered powdered metals. It helps improve the properties and performance of the final product.
Used in Electronic Tubes:
Titanium hydride serves as a getter for oxygen and nitrogen in electronic tubes, helping to maintain a vacuum and improve the performance of the tubes.
Used in Ceramic to Metal Seals:
Titanium hydride acts as a wetting agent for ceramic to metal seals, enhancing the bonding and performance of the seals.
Used in Metal Foam Production:
Titanium hydride is used in the production of metal foam, a lightweight and strong material with various applications.
Used in Pyrotechnics:
Titanium hydride is involved in various pyrotechnic applications, such as creating sparks or flames for signaling or illumination purposes.
Used in Sports Equipment:
Titanium hydride is used in the production of sports equipment, such as golf club heads, due to its lightweight and strong properties.
Used as a Laboratory Reagent:
Titanium hydride is used as a laboratory reagent for various chemical reactions and experiments.
Used as a Blowing Agent:
Titanium hydride is used as a blowing agent in the manufacturing of certain products, such as foams or lightweight materials.
Used as a Source for Titanium Powder, Alloys, and Coatings:
Titanium hydride is used as a source for producing pure titanium powder, alloys, and coatings, which have various applications in industries such as aerospace, automotive, and medical.
Used as a Getter in Vacuum Systems:
Titanium hydride serves as a getter in vacuum systems, helping to maintain a vacuum and improve the performance of the system.
Used as a Sealer of Metals:
Titanium hydride is used as a sealer of metals, enhancing the bonding and performance of metal components.

Preparation

Titanium hydride is prepared by heating titanium dioxide with calcium hydride at 600°C in the presence of hydrogenAlso, the hydride may be prepared by heating tianium metal with hydrogen at elevated temperatures.

Air & Water Reactions

Highly flammable. Pyrophoric in dust form [Bretherick 1979. p. 104]. Insoluble in water.

Reactivity Profile

Hydrides, such as TITANIUM HYDRIDE, are reducing agents and react rapidly and dangerously with oxygen and with other oxidizing agents, even weak ones. Thus, they are likely to ignite on contact with alcohols. Hydrides are incompatible with acids, alcohols, amines, and aldehydes.

Hazard

Flammable, dangerous fire risk, dust may explode in presence of oxidizing agents.

Flammability and Explosibility

Notclassified

InChI:InChI=1/Ti.2H/q+2;2*-1

Synthetic route

titanium (7440-32-6) + hydrogen (1333-74-0) + oxygen (80937-33-3) → titanium(IV) hydroxide (20338-08-3) + titanium dihydride (7704-98-5) + [TiH(OH)3] (956378-98-6) + titanium dihydroxide (42765-12-8) + HTiO(OH)

Conditions	Yield
In neat (no solvent) Irradiation (UV/VIS); laser ablated Zr co-deposited with H2+O2 in excess Ar onto a 10K CsI window, UV-irradiated, annealed at 22-34 K (mechanism discussed); not isolated, detected by IR;

titanium (7440-32-6) + hydrogen (1333-74-0) + oxygen-18 (32767-18-3) → titanium dihydride (7704-98-5) + Ti((18)OH)2 (872215-20-8) + HTi(18)O((18)OH) + HTi((18)OH)3 + Ti((18)OH)4 (872207-84-6)

Conditions	Yield
In neat (no solvent) laser ablated Zr co-deposited with H2+(18)O2 in excess Ar onto a 10K CsIwindow, annealed at 20 K (mechanism discussed); not isolated, detected by IR;

titanium (7440-32-6) + hydrogen (1333-74-0) → titanium dihydride (7704-98-5)

Conditions	Yield
500°C, p(H2)= 1.5-2 MPa, according to: K. N. Semenenko, V. P. Malyshev, L. A. Petrova, et al., Izv. Akad. Nauk SSSR, Neorg. Mater. 13 (1977) 2009;

lanthanum nickel + titanium dihydride (7704-98-5) → LaNi5H7.0

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → H0.71Ti

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.85

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + LaNi2.00 → LaNi2H4.2

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

lanthanum nickel + titanium dihydride (7704-98-5) → LaNiH3.1

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + La3Ni → La3NiH8.5

Conditions	Yield
components mixt. placing in glass vac. apparatus of Sieberts type, 20-25°C, P<1 atm; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → titanium hydride

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

lanthanum (7439-91-0) + titanium dihydride (7704-98-5) → lanthanum trihydride (13864-01-2)

Conditions	Yield
components placing in glass vac. apparatus of Sieverts type (20-25°C, P<1 atm), according to: V. I. Mikheeva, M. E. Kost, Zhur. Neorg. Khim. 3 (1958) 260; chem. anal.; X-ray diffraction, thermogravimetric and differential thermal anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.30

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.90

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.49

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.73

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.04

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.23

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.51

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH1.58

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

titanium dihydride (7704-98-5) + hydrogen (1333-74-0) → TiH0.17

Conditions	Yield
TiH2 grinding (argon atmosphere), loading into autoclave, Ar traces removal (room temp., vac. until ca. 1 Pa reached), heating to 500-750°C, admitting calulated hydrogen amount, sytem equilibration (500°C, 1 h); gas volumetric anal.;

Upstream product

• 7440-32-6 titanium 
• 1333-74-0 hydrogen 
• 80937-33-3 oxygen 
• 32767-18-3 oxygen-18 

Downstream Products

• 13864-01-2 lanthanum trihydride 

Relevant articles and documents

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