Карбид тантала (Ta2C)

Description

Tantalum carbide of composition Ta₂C is a subcarbide (hemicarbide) of tantalum, the second stable phase of the tantalum-carbon system along with TaC monocarbide. The carbon content is half that of TaC and the lattice differs from the cubic structure of monocarbide. The product belongs to refractory carbides: the melting point of 3327 °C given in the card puts it on a par with the most heat-resistant ceramic materials. The position "Tantalum carbide (Ta2C)" in the TSCA registry has the status ACTIVE.

Basic Attributes

• CAS No: 12070-07-4
• Chemical formula: CTa₂
• Molecular weight on card: 192.96
• Exact weight on card: 377.927
• EU number on the card: 235-118-3
• PSA Features: 0

Physico-chemical properties

• Density: 15,100
• Melting point: 3327 °C

Notes on Identity Data

Three card positions require verification upon purchase.

• The molecular weight of 192.96 coincides with the value for TaC monocarbide and does not correspond to the composition of Ta₂C: two tantalum atoms of 180.948 plus a carbon atom give about 373.9
• The exact mass of 377.927 also does not agree with the calculation using the CTa₂ formula
• The EC number 235-118-3 on the card is the same as the number listed for tantalum monocarbide

The matches indicate the transfer of part of the identification data from the TaC card. Density 15.100 and melting point 3327 °C refer specifically to subcarbide and differ from those of monocarbide. When ordering, identify the product by CAS number 12070-07-4 and by stoichiometry, not by molecular weight or EC number.

Scope of application

Tantalum subcarbide is used in the materials science of refractory compounds as a phase of the Ta-C system: it is formed during incomplete carburization of tantalum and is present in the transition layers of carbide coatings and sintered materials. Specific industrial applications for this particular CAS are not listed in open reference databases - the PubChem application section for the position contains only a record of TSCA status. Technological parameters and purpose of a specific batch should be clarified with the manufacturer.

Safety Information

• WGK Germany: 3 - the substance is classified as highly hazardous to the aquatic environment
• Harmonized phrases H and P, transport classification, labels and hazard class codes are not given on the card - data should be taken from the batch’s safety data sheet

Storage and handling

The product comes in powder form. Keep the container tightly closed, the warehouse dry and ventilated. Fine powders of refractory carbides irritate the respiratory tract and, at a certain concentration in the air, create a risk of dust ignition, so weighing is carried out with a local hood, in a respirator and safety glasses, without dust or sparking. Discharge of product and rinsing water into sewerage is not permitted: class WGK Germany 3.