Titanium carbide

Titanium carbide, TiC, is an extremely hard (Mohs 9–9.5) refractory ceramic material, similar to tungsten carbide. It has the appearance of black powder with the sodium chloride (face-centered cubic) crystal structure. As found in nature its crystals range in size from 0.1 to 0.3mm.

Titanium carbide
Names
IUPAC name
titanium carbide
Other names
titanium(IV) carbide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.031.916
UNII
Properties
TiC
Molar mass 59.89 g/mol
Appearance black powder
Density 4.93 g/cm3
Melting point 3,160 °C (5,720 °F; 3,430 K)
Boiling point 4,820 °C (8,710 °F; 5,090 K)
insoluble in water
+8.0·10−6 cm3/mol
Structure
Cubic, cF8
Fm3m, No. 225
Octahedral
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

It occurs in nature as a form of the very rare mineral Khamrabaevite (see Khamrabaevite, Russian: Хамрабаевит) - (Ti,V,Fe)C. It was discovered in 1984 on Mount Arashan in the Chatkal District,[1] USSR (modern Kyrgyzstan), near the Uzbek border. The mineral was named after Ibragim Khamrabaevich Khamrabaev, director of Geology and Geophysics of Tashkent, Uzbekistan.

Physical properties

Titanium carbide has an elastic modulus of approximately 400 GPa and a shear modulus of 188 GPa.[2]

Manufacturing and machining

Tool bits without tungsten content can be made of titanium carbide in nickel-cobalt matrix cermet, enhancing the cutting speed, precision, and smoothness of the workpiece.

The resistance to wear, corrosion, and oxidation of a tungsten carbide–cobalt material can be increased by adding 6–30% of titanium carbide to tungsten carbide. This forms a solid solution that is more brittle and susceptible to breakage.

Titanium carbide can be etched with reactive-ion etching.

Applications

Titanium carbide is used in preparation of cermets, which are frequently used to machine steel materials at high cutting speed. It is also used as an abrasion-resistant surface coating on metal parts, such as tool bits and watch mechanisms.[3] Titanium carbide is also used as a heat shield coating for atmospheric reentry of spacecraft.[4]

7075 aluminium alloy (AA7075) is almost as strong as steel, but weighs one third as much. Using thin AA7075 rods with TiC nanoparticles allows larger alloys pieces to be welded without phase-segregation induced cracks.[5]

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See also

References
  1. Dunn, Pete J (1985). "New mineral names". American Mineralogist. 70: 1329–1335.
  2. Chang, R; Graham, L (1966). "Low‐Temperature Elastic Properties of ZrC and TiC". Applied Physics. 37: 3778. doi:10.1063/1.1707923.
  3. Gupta, P.; Fang, F.; Rubanov, S.; Loho, T.; Koo, A.; Swift, N.; Fiedler, H.; Leveneur, J.; Murmu, P.P.; Markwitz, A.; Kennedy, J. (2019). "Decorative black coatings on titanium surfaces based on hard bi-layered carbon coatings synthesized by carbon implantation". Surface and Coatings Technology. 358: 386–393. doi:10.1016/j.surfcoat.2018.11.060.
  4. Sforza, Pasquale M. (13 November 2015). Manned Spacecraft Design Principles. Elsevier. p. 406. ISBN 9780124199767. Retrieved 4 January 2017.
  5. "New welding process opens up uses for formerly un-weldable lightweight alloy". newatlas.com. Retrieved 2019-02-18.
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