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Zirconium carbide

From Wikipedia, the free encyclopedia

Zirconium carbide
Image:Zirconium(IV) carbide.jpg
General
Other names zirconium(IV) carbide
Molecular formula ZrC
Molar mass 103.235 g/mol
Appearance gray refractory solid
Crystal structure cubic
CAS number [12020-14-3]
Properties
Density and phase 6.73 g/cm3, solid
Solubility reacts with water, soluble in acids
Melting point 3532°C
Boiling point 5100°C
Magnetic susceptibility -2.6e-005 cm3/mol
Hazards
EU classification not listed
NFPA 704
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Zirconium carbide (ZrC) is an extremely hard refractory ceramic material, commercially used in tool bits for cutting tools. It is usually processed by sintering. It has the appearance of a gray metallic powder with cubic crystal structure. It is highly corrosion resistant.

Zirconium carbide reacts with water and acids and is pyrophoric.

Mixture of zirconium carbide and tantalum carbide is an important cermet material.

Hafnium-free zirconium carbide and niobium carbide can be used as refractory coatings in nuclear reactors. Zirconium carbide is used extensively as coating of uranium dioxide and thorium dioxide particles of nuclear fuel. The coating is usually deposited by thermal chemical vapor deposition in a fluidized bed reactor.

It is also used as an abrasive, in metal cladding, in cermets, incandescent filaments and cutting tools.

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