Tantalum carbide

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Tantalum carbide
Other names tantalum (IV) carbide
Identifiers
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Properties
TaC
Molar mass 192.959 g/mol
Appearance black-gray odorless powder
Density 13.9 g/cm3, solid
Melting point
Boiling point
Hazards
EU classification {{{value}}}
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references


Overview

Tantalum carbide (TaC) is an extremely hard refractory ceramic material, commercially used in tool bits for cutting tools. The hardness even exceeds that of diamond [1]. It is a heavy, brown powder usually processed by sintering, and an important cermet material. It is sometimes used as a fine-crystalline additive to tungsten carbide alloys. Tantalum carbide has the distinction of being the stoichiometric binary compound with the highest known melting point, at 4150 K (3880°C) [2]. The substoichiometric compound TaC0.89 has a higher melting point, near 4270 K (4000°C)[3].

When used as a mould coating, it produces a low friction surface.

Tantalum carbide-graphite composite material, developed in Los Alamos National Laboratory, is one of the hardest materials ever synthesized.

Dusts from grinding can be flammable.

Substances to avoid are: flammable gases (dust may form explosive mixtures with gases)

See also

References

  1. Nature's Building Blocks ANA-Z guide to the elements, ' J. Emsley, 2001, ISBN 0-19-850340-7, p. 421
  2. CRC Handbook of Chemistry and Physics, 85th Edition, 2004, ISBN 0-8493-0485-7
  3. The Inorganic Chemistry of Materials: How to Make Things Out Of Elements, P.J. van der Put, 1998, ISBN 0306457318, p. 129


de:Tantalcarbid



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